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All 833 tools
Search or scan the complete browser-tool collection.
833 tools
Astrology 8
Biorhythm Calculator
Biorhythm calculator: physical, emotional, and intellectual cycles from birth date to a target date.
Open calculatorChinese Zodiac Calculator
Chinese zodiac calculator: animal sign and element from birth year, with lunar-new-year caveat.
Open calculatorMercury Retrograde Calculator
Mercury retrograde calculator: check if a date falls in a retrograde window, 2024-2030.
Open calculatorNumerology Life Path Calculator
Numerology life path calculator: reduce a birth date to its life path number, master numbers kept.
Open calculatorNumerology Name Number Calculator
Numerology name number calculator: Pythagorean letter values for any name, entertainment only.
Open calculatorZodiac Compatibility Calculator
Zodiac compatibility calculator: sun-sign match score by element and modality, entertainment only.
Open calculatorZodiac Element Calculator
Zodiac element calculator: element, modality, and ruling planet for any sun sign.
Open calculatorZodiac Sign Calculator
Zodiac sign calculator: find your sun sign, element, modality, and ruling planet from a birth date.
Open calculatorAstronomy 8
Distance Modulus Calculator
Distance modulus calculator: distance from apparent and absolute magnitude.
Open calculatorLight Year Distance Calculator
Light year distance calculator: convert light years to kilometers, miles, and AU.
Open calculatorMoon Phase Calculator
Moon phase calculator: current moon phase from the synodic cycle.
Open calculatorOrbital Period Calculator
Orbital period calculator: circular orbit period around Earth from altitude (Kepler).
Open calculatorPlanetary Weight Calculator
Planetary weight calculator: your weight on other planets and moons from surface gravity ratios.
Open calculatorStar Magnitude Calculator
Star magnitude calculator: brightness ratio between two apparent magnitudes.
Open calculatorStellar Temperature Calculator
Stellar temperature calculator: blackbody temperature from peak wavelength (Wien's law).
Open calculatorTelescope Magnification Calculator
Telescope magnification calculator: power from focal length and eyepiece.
Open calculatorBiology 7
Blood Type Inheritance Calculator
Blood type inheritance calculator: possible ABO child blood types from two parents.
Open calculatorChargaff Rule Calculator
Chargaff rule calculator: predict T, G, and C percentages from adenine percentage in double-stranded DNA.
Open calculatorDNA GC Content Calculator
DNA GC content calculator: GC and AT percentage from nucleotide counts.
Open calculatorDoubling Time Calculator
Doubling time calculator: population or cell culture generation time from start and end counts.
Open calculatorHardy Weinberg Calculator
Hardy Weinberg calculator: genotype frequencies from allele frequency under equilibrium.
Open calculatorProtein Molecular Weight Calculator
Protein molecular weight calculator: approximate mass from amino acid chain length.
Open calculatorPunnett Square Calculator
Punnett square calculator: monohybrid cross offspring genotype and phenotype probabilities.
Open calculatorChemistry 21
Average Atomic Mass Calculator
Calculate average atomic mass from isotope masses and abundances.
Open calculatorBuffer Solution Calculator
Calculate buffer pH using the Henderson-Hasselbalch equation.
Open calculatorC1V1 = C2V2 Calculator
Solve for concentration or volume in C1V1 = C2V2 dilution equations.
Open calculatorDilution Calculator (C1V1=C2V2)
Solve dilution problems using C1V1 = C2V2 to find stock or final volumes.
Open calculatorElectron Configuration Calculator
Find the electron configuration for any element by atomic number.
Open calculatorEmpirical Formula Calculator
Find the empirical formula from percent composition or mass data.
Open calculatorEquilibrium Constant Calculator
Calculate the equilibrium constant K from reactant and product concentrations.
Open calculatorGas Laws Calculator
Apply Boyle's, Charles', and the Ideal Gas Law to gas properties.
Open calculatorLimiting Reagent Calculator
Find the limiting reagent from two reactants and calculate product yield.
Open calculatorMolar Mass Calculator
Calculate the molar mass of a compound from its chemical formula.
Open calculatorMolarity Calculator
Calculate molarity from moles and volume, with solution prep details.
Open calculatorMolarity from Mass Calculator
Convert grams of solute to molarity using molar mass and volume.
Open calculatorMole Calculator
Mole calculator: moles from mass and molar mass (chemistry).
Open calculatorPercent Solution Calculator
Calculate percent solution concentration by weight or volume.
Open calculatorPercent Yield Calculator
Calculate percent yield from actual and theoretical yield.
Open calculatorReaction Rate Calculator
Calculate reaction rate from concentration change over time.
Open calculatorSerial Dilution Calculator
Calculate serial dilution concentrations and cumulative dilution factors.
Open calculatorSignificant Figures Calculator
Significant figures calculator: round a number to a given number of significant digits.
Open calculatorStoichiometry Calculator
Calculate reactant and product quantities from balanced equation ratios.
Open calculatorTitration Calculator
Calculate solution concentrations and equivalence points in titration.
Open calculatorpH Calculator
Calculate pH, pOH, and hydrogen/hydroxide ion concentration for acids and bases.
Open calculatorColors & Design 11
Background Text Color Calculator
Background text color calculator: choose black or white text on any background color for best contrast.
Open calculatorColor Difference Calculator
Color difference calculator: CIE76 delta E between two hex colors for design QA.
Open calculatorColor Gradient Calculator
Color gradient calculator: interpolate between two hex colors and get a mid-tone blend.
Open calculatorColor Mixer Calculator
Color mixer calculator: blend two hex colors by any percentage to predict a paint or digital mix.
Open calculatorColor Palette Generator
Color palette generator: harmonic color schemes from a base hex color, computed locally.
Open calculatorColor Tint Shade Calculator
Color tint shade calculator: lighten and darken a hex color in steps, generated locally.
Open calculatorComplementary Color Finder
Complementary color finder: the exact opposite hue on the color wheel for any hex color.
Open calculatorHex to CMYK Converter
Hex to CMYK converter: convert a #RRGGBB hex color to CMYK values for print.
Open calculatorHex to HSL Converter
Hex to HSL converter: convert a hex color to HSL values and CSS string.
Open calculatorLuminance Brightness Calculator
Luminance calculator: relative luminance of a hex color and its perceived brightness.
Open calculatorRGB to Hex Converter
RGB to hex converter: convert red, green, blue values (0–255) to a #RRGGBB hex color instantly.
Open calculatorConstruction & Measurement 66
AC BTU Calculator
AC BTU calculator: estimate cooling capacity needed for a room from area and conditions.
Open calculatorAsphalt Calculator
Estimate asphalt volume, weight, waste, and material cost for a rectangular paving area.
Open calculatorBacksplash Calculator
Backsplash calculator: material area for a kitchen backsplash after subtracting openings.
Open calculatorBaluster Spacing Calculator
Baluster spacing calculator: even spacing for railing balusters.
Open calculatorBaseboard Calculator
Baseboard calculator: linear feet and boards for a room.
Open calculatorBeam Load Calculator
Beam load calculator: max deflection of a uniformly loaded simple beam (simplified).
Open calculatorBoard Foot Calculator
Calculate lumber volume in board feet from thickness, width, length, and quantity.
Open calculatorBrick Calculator
Brick calculator: estimate bricks for a wall from dimensions, brick size, and mortar joints.
Open calculatorCeiling Fan Size Calculator
Ceiling fan size calculator: blade span by room size.
Open calculatorCeiling Tile Calculator
Ceiling tile calculator: 2x2 drop-ceiling tiles for a room.
Open calculatorChair Rail Calculator
Chair rail calculator: classic height from ceiling height.
Open calculatorConcrete Calculator
Estimate concrete volume, weight, and bags for a slab. Includes a built-in waste factor so you order enough the first time.
Open calculatorCountertop Calculator
Countertop calculator: countertop cost from square feet.
Open calculatorCrown Molding Calculator
Crown molding calculator: linear feet and boards needed for a room.
Open calculatorCurtain Length Calculator
Curtain length calculator: panel length from window height.
Open calculatorDeck Board Calculator
Deck board calculator: decking boards for a deck area.
Open calculatorDeck Stain Calculator
Deck stain calculator: gallons of stain from deck area and coats, with coverage assumptions.
Open calculatorDecking Calculator
Estimate deck boards and linear footage using deck dimensions, board width, gap, and waste.
Open calculatorDrywall Calculator
Estimate drywall sheets, joint compound, screws, waste, and optional sheet cost for a room.
Open calculatorFabric Yardage Calculator
Fabric yardage calculator: yards of fabric for a project.
Open calculatorFence Material Calculator
Estimate fence sections, posts, rails, and pickets from run length and spacing.
Open calculatorFence Post Calculator
Fence post calculator: posts and rails for a fence run.
Open calculatorFlooring Calculator
Estimate flooring area, waste allowance, and boxes required for a room.
Open calculatorGarage Size Calculator
Garage size calculator: minimum dimensions by car count.
Open calculatorGenerator Size Calculator
Generator size calculator: watts needed for running loads plus starting surge.
Open calculatorGrade Percentage Calculator
Grade percentage calculator: slope as percent and degrees.
Open calculatorGravel Calculator
Estimate gravel volume, weight, waste, and optional material cost for a rectangular area.
Open calculatorGrout Calculator
Grout calculator: pounds of grout for a tile job.
Open calculatorGutter Size Calculator
Gutter size calculator: 5-inch or 6-inch gutter by roof area.
Open calculatorInsulation R Value Calculator
Insulation R-value calculator: total R from layered materials.
Open calculatorInsulation R-Value Calculator
Insulation R-value calculator: U-value conversion and rough annual savings estimate.
Open calculatorLawn Seed Calculator
Lawn seed calculator: pounds of seed needed for your lawn area.
Open calculatorLumber Calculator
Lumber calculator: board feet and total cost from nominal dimensions and length.
Open calculatorMulch Calculator
Mulch calculator: cubic yards and bags for garden beds.
Open calculatorMulch and Soil Calculator
Estimate cubic yards of mulch or soil from area, depth, and waste allowance.
Open calculatorPaint Calculator
Estimate how many gallons of paint you need for walls, doors, and trim. Covers two coats and accounts for waste.
Open calculatorPaint Coverage Calculator
Estimate paintable wall area and gallons needed after subtracting doors and windows.
Open calculatorPatio Paver Calculator
Patio paver calculator: pavers needed with waste.
Open calculatorPaver Calculator
Estimate paver count, base aggregate, bedding sand, waste, and optional paver cost.
Open calculatorPipe Sizing Calculator
Pipe sizing calculator: minimum pipe diameter for a target flow rate and velocity.
Open calculatorPipe Volume Calculator
Pipe volume calculator: volume of water in a pipe from diameter and length.
Open calculatorPond Volume Calculator
Pond volume calculator: gallons in a rectangular pond.
Open calculatorPool Volume Calculator
Pool volume calculator: gallons in a rectangular, round, or oval pool.
Open calculatorRain Barrel Calculator
Rain barrel calculator: gallons collected from roof runoff.
Open calculatorRaised Bed Soil Calculator
Raised bed soil calculator: soil volume for a garden bed.
Open calculatorRoof Pitch Calculator
Roof pitch calculator: roof angle and slope factor from rise per foot of run.
Open calculatorRoofing Calculator
Estimate roof area, roofing squares, and shingle bundles from footprint and pitch.
Open calculatorRug Size Calculator
Rug size calculator: recommended rug for a room.
Open calculatorShiplap Calculator
Shiplap calculator: boards needed for a wall with waste.
Open calculatorSiding Calculator
Siding calculator: squares of siding from wall area and waste allowance.
Open calculatorSlope Calculator
Slope calculator: degrees, percent grade, and ratio from rise and run.
Open calculatorSprinkler Heads Calculator
Sprinkler heads calculator: heads needed for a lawn area.
Open calculatorSquare Feet to Linear Feet Calculator
Convert square feet or square yards to linear material length using the required material width.
Open calculatorSquare Footage Calculator
Calculate square footage for rooms and projects with waste allowance, square-yard/meter/acre conversions, and optional material cost estimate.
Open calculatorStair Calculator
Estimate stair riser count, actual riser height, treads, total run, and stringer length.
Open calculatorStaircase Calculator
Staircase calculator: number of treads and total run from floor height and chosen rise.
Open calculatorSump Pump Calculator
Sump pump calculator: gallons per minute needed for a basement.
Open calculatorTank Volume Calculator
Tank volume calculator: cylindrical tank capacity.
Open calculatorTile Calculator
Estimate tiles and boxes required from surface and tile dimensions with waste.
Open calculatorTile Count Calculator
Tile count calculator: tiles needed for a floor or wall.
Open calculatorToilet Water Calculator
Toilet water calculator: gallons used per year.
Open calculatorWainscoting Calculator
Wainscoting calculator: panels needed for a wall.
Open calculatorWallpaper Calculator
Wallpaper calculator: rolls needed from wall area, roll coverage, and pattern waste.
Open calculatorWater Heater Sizing Calculator
Water heater sizing calculator: first-hour rating from peak hot water uses.
Open calculatorWater Pressure Calculator
Water pressure calculator: static pressure from elevation head.
Open calculatorWindow Size Calculator
Window size calculator: recommended window area for a room.
Open calculatorConverters 52
ASCII Converter
ASCII converter: characters to ASCII codes and back.
Open converterAncient Unit Converter
Convert classical ancient units: cubit, palm, digit, stadium, talent, and more. See modern equivalents for historical measures. Private, no account.
Open converterAngle Converter
Angle converter: degrees, radians, and gradians.
Open converterArea Converter
Area converter: square feet, acres, hectares, and square meters.
Open converterBaking Conversions
Convert cooking and baking measurements between cups, tablespoons, teaspoons, grams, ounces, milliliters, and liters, with ingredient densities.
Open converterBase64 Encoder Decoder
Encode and decode Base64 text, with local previews for PNG, JPEG, GIF, and WebP image data.
Open converterBelt Size Calculator
Belt size calculator: belt length from waist size.
Open converterCSV to JSON Converter
Convert CSV to JSON instantly — paste comma or tab-separated data and get a clean JSON array of objects. Free, private, runs in your browser.
Open converterChildren Size Converter
Children size converter: US to EU kids clothing sizes.
Open converterCrochet Hook Converter
Crochet hook converter: US letters to millimeters.
Open converterDPI Calculator
DPI calculator: pixels per inch from pixel dimensions and print size.
Open converterData Storage Converter
Data storage converter: bytes, KB, MB, GB, TB (binary 1024 base).
Open converterDistance Between ZIP Codes Calculator
Distance between ZIP codes calculator: straight-line miles.
Open converterDress Size Converter
Dress size converter: US to EU and UK dress sizes.
Open converterEnergy Converter
Energy converter: joules, kilowatt-hours, calories, BTUs.
Open converterGlove Size Calculator
Glove size calculator: S/M/L/XL from hand circumference.
Open converterHat Size Calculator
Hat size calculator: US hat size from head circumference.
Open converterHectare to Acre Converter
Hectare to acre converter: hectares, acres, square meters.
Open converterHex to Decimal Converter
Convert hexadecimal and decimal values with an interactive positional-value explanation.
Open converterHorsepower to kW Converter
Horsepower to kW converter: hp and kilowatts.
Open converterImage Resizer
Resize images without uploading to a server.
Open converterInches to CM Converter
Inches to centimeters converter: inches to cm, mm, meters, and feet.
Open converterJean Size Calculator
Jean size calculator: US to EU jean size conversion.
Open converterKnitting Needle Converter
Knitting needle converter: US, mm and UK needle sizes.
Open converterLength Converter
Length converter: miles, kilometers, meters, feet, inches, yards.
Open converterLiters to Ounces Converter
Convert liters to US or imperial fluid ounces with common-value reference tables.
Open converterMetric Prefix Converter
Metric prefix converter: kilo, mega, giga, tera and friends.
Open converterOctal Converter
Octal converter: decimal, binary, octal and hex.
Open converterPDF to JPG Converter
Convert PDF pages to images directly in your browser.
Open converterPressure Converter
Pressure converter: psi, bar, kPa, atm.
Open converterRing Size Calculator
Ring size calculator: US ring size from finger circumference.
Open converterRoman Numeral Converter
Convert between decimal numbers and Roman numerals (1–4999) in either direction with validation.
Open converterScale Converter
Scale converter: real-world size from map or blueprint scale.
Open converterScientific Notation Converter
Convert any number to and from scientific and engineering notation with significant-figure control.
Open converterScreen Size Calculator
Screen size calculator: width and height from diagonal and aspect.
Open converterShoe Size Conversion
Shoe size conversion: US men's and women's to UK, EU, and centimeters (approximate).
Open converterSitemap Validator
Validate XML sitemap and robots basics.
Open converterSpeed Converter
Speed converter: mph, km/h, m/s, ft/s, and knots.
Open converterStone to Pounds Converter
Stone to pounds converter: stone, pounds, kg.
Open converterTemperature Converter
Temperature converter: Celsius, Fahrenheit, and Kelvin.
Open converterText Case Converter
Change text case in one click — lower, upper, title, and sentence case. Free and private; nothing is uploaded. Paste and convert instantly.
Open converterTitle Case Converter
Title case converter: convert any text to title case with proper small-word handling.
Open converterTorque Converter
Torque converter: newton-meters, foot-pounds, inch-pounds.
Open converterUS to EU Size Converter
US to EU size converter: general clothing conversion.
Open converterUnit Converter
Convert common units instantly across length, area, weight, temperature, volume, speed, and pressure.
Open converterVolume Converter
Volume converter: gallons, liters, quarts, cups, fluid ounces, milliliters.
Open converterWeight Converter
Weight converter: pounds, kilograms, ounces, grams, and stones.
Open converterYard to Feet Converter
Yard to feet converter: yards, feet, inches.
Open converterYarn Weight Converter
Yarn weight converter: US names to wraps per inch and needle size.
Open converterZIP Code County Lookup
ZIP code county lookup: county, FIPS code, and population for any US ZIP.
Open converterZIP Code Lookup
ZIP code lookup: city, county and state for any US ZIP, or ZIPs for a city.
Open converterZIP Code Timezone Calculator
ZIP Code timezone calculator: find the timezone and current local time for any US ZIP.
Open converterEnergy & Electrical 24
Appliance Energy Cost Calculator
Appliance energy cost calculator: running cost from wattage, usage, and your electricity rate.
Open calculatorBattery Bank Calculator
Battery bank calculator: amp-hours for an off-grid system.
Open calculatorBattery Life Calculator
Battery life calculator: runtime from battery capacity, voltage, and load power.
Open calculatorBattery Runtime Calculator
Estimate ideal and adjusted battery runtime from capacity, voltage, load, efficiency, and usable depth.
Open calculatorBreaker Size Calculator
Breaker size calculator: breaker amps from load watts.
Open calculatorCapacitance Calculator
Capacitance calculator: capacitance from stored energy and voltage.
Open calculatorDehumidifier Sizing Calculator
Dehumidifier sizing calculator: pints per day by room size and dampness.
Open calculatorEV Charging Cost Calculator
Estimate energy drawn, per-charge cost, monthly charging cost, and cost per mile for an EV.
Open calculatorElectric Bill Estimator
Electric bill estimator: monthly bill from kWh usage, rate, and fixed fees.
Open calculatorElectricity Cost Calculator
Estimate appliance energy use and daily, monthly, and annual electricity cost.
Open calculatorFurnace Size Calculator
Furnace size calculator: BTU and tonnage from square footage.
Open calculatorGenerator Load Calculator
Generator load calculator: wattage needed for appliances.
Open calculatorGenerator Runtime Calculator
Generator runtime calculator: hours on a tank of fuel.
Open calculatorInductance Calculator
Inductance calculator: inductance from inductive reactance and frequency.
Open calculatorInverter Size Calculator
Inverter size calculator: continuous and surge sizing.
Open calculatorLED Savings Calculator
Compare old and LED lighting energy cost, annual savings, and simple payback period.
Open calculatorLumens Calculator
Lumens calculator: light output needed for a room.
Open calculatorPower Factor Calculator
Power factor calculator: PF from real watts and apparent volt-amps.
Open calculatorRC Time Constant Calculator
RC time constant calculator: charge/discharge time constant and charge percentage.
Open calculatorSolar Panel Savings Calculator
Solar panel savings calculator: annual savings and payback period from system size, cost, and utility rate.
Open calculatorTransformer Calculator
Transformer calculator: output voltage or turns ratio for an ideal transformer.
Open calculatorWatts to Amps Calculator
Convert watts to amps for DC, single-phase AC, or three-phase AC with voltage and power factor.
Open calculatorWind Turbine Output Calculator
Wind turbine output calculator: power from blade size and wind speed.
Open calculatorWire Size Calculator
Wire size calculator: suggested AWG for a current and run length (copper, 3% drop target).
Open calculatorEveryday Calculators 134
Absolute Value Calculator
Absolute value calculator: distance from zero.
Open calculatorAge Calculator
Calculate exact calendar age, total elapsed days, and time until the next birthday.
Open calculatorAmortization Calculator
Calculate your monthly loan payment and full amortization schedule, and see how extra monthly payments shorten the term and reduce total interest.
Open calculatorAnnuity Calculator
Estimate the future value or payout of an annuity based on deposit, rate, and term.
Open calculatorArc Length Calculator
Arc length calculator: distance along a circle arc.
Open calculatorArea Perimeter Calculator
Area and perimeter calculator: rectangle, triangle, circle.
Open calculatorAspect Ratio Calculator
Calculate the aspect ratio from width and height, or the missing dimension to hit a target ratio like 16:9.
Open calculatorBPM to Delay Time Calculator
Convert BPM (beats per minute) into delay and reverb timing in milliseconds for quarter, eighth, and dotted eighth notes.
Open calculatorBTU Calculator
Estimate the BTUs needed to heat or cool a room based on size and conditions.
Open calculatorBig Number Calculator
Big number calculator: exact arithmetic on numbers up to 10^30.
Open calculatorBond Calculator
Estimate a bond's current yield and price from coupon rate, face value, and market rate.
Open calculatorCD Calculator
Calculate the maturity value and interest earned on a Certificate of Deposit over its term.
Open calculatorCalories Burned Calculator
Estimate calories burned during exercise using MET values and body weight.
Open calculatorCircle Area Calculator
Circle area calculator: area and circumference from radius.
Open calculatorCircle Calculator
Find a circle's area, circumference, diameter, or radius from any one value.
Open calculatorCitation Formatter
Format a book, website, or article into APA and MLA citations from author, title, publisher, year, and URL.
Open calculatorCoefficient of Variation Calculator
Calculate the coefficient of variation (relative standard deviation). Enter the mean and standard deviation to compare variability across data sets.
Open calculatorCoin Flip Tool
Flip one or up to 100 coins locally with secure browser randomness, counts, percentages, streaks, and sequence.
Open calculatorCombinations Calculator (nCr)
Calculate the number of combinations (nCr) of choosing r items from n, with the formula explained.
Open calculatorComplex Number Calculator
Complex number calculator: add, subtract, multiply complex numbers.
Open calculatorConcrete Cost Per Square Foot Calculator
Estimate concrete cost per square foot and total for a slab from your own rate and waste.
Open calculatorCone Volume Calculator
Cone volume calculator: volume from radius and height.
Open calculatorConfidence Interval Calculator
Compute a confidence interval for a sample mean given size, std dev, and confidence level.
Open calculatorContrast Ratio Calculator (WCAG)
Check the contrast ratio between two colors and see whether it passes WCAG AA and AAA for normal and large text.
Open calculatorCross Product Calculator
Cross product calculator: vector product of two 3D vectors.
Open calculatorCurrency Converter
Free currency converter between 15+ major currencies — USD, EUR, GBP, JPY and more. Quick estimates with reference rates, no signup.
Open calculatorDaily Hydration Calculator
Estimate your daily water intake from body weight, activity minutes, and climate temperature.
Open calculatorData Transfer Rate Calculator
Estimate how long a file takes to transfer at a given speed, or the effective rate given size and time.
Open calculatorDay of the Week Calculator
Day of the week calculator: what weekday was any date, plus week number and day of year.
Open calculatorDays Between Dates Calculator
Find the number of days, weeks, and weekdays between two dates.
Open calculatorDepreciation Calculator
Estimate straight-line or declining-balance depreciation over an asset's life.
Open calculatorDice Roller
Roll 1–10 selectable D4, D6, D8, D10, D12, or D20 dice using unbiased local browser randomness.
Open calculatorDot Product Calculator
Dot product calculator: scalar product of two 3D vectors.
Open calculatorDue Date Calculator
Estimate your pregnancy due date from your last period or conception date.
Open calculatorEMI Calculator
Calculate the equated monthly installment (EMI) for a fixed-rate loan, plus total interest and an amortization schedule.
Open calculatorEllipse Calculator
Ellipse calculator: area and approximate circumference.
Open calculatorEndpoint Calculator
Endpoint calculator: missing endpoint from midpoint and one endpoint.
Open calculatorExponent Calculator
Calculate a base raised to an exponent, including negative and fractional exponents.
Open calculatorExponential Growth Calculator
Exponential growth calculator: value after continuous growth.
Open calculatorFactorial Calculator
Factorial calculator: n! for any integer up to 170.
Open calculatorFibonacci Calculator
Fibonacci calculator: nth Fibonacci number.
Open calculatorFlight Carbon Footprint Calculator
Flight carbon footprint calculator: estimated CO2 per passenger for a flight, by distance and cabin class.
Open calculatorFraction Operations Calculator
Fraction operations calculator: add, subtract, multiply, divide fractions.
Open calculatorFractions Calculator
Add, subtract, multiply, or divide two fractions and get the simplified result.
Open calculatorFuel & Trip Cost Calculator
Estimate fuel used, total trip cost, and each traveler’s share in MPG or L/100 km mode.
Open calculatorGCF and LCM Calculator
Find the greatest common factor and least common multiple of two numbers.
Open calculatorGas Mileage Calculator
Calculate miles per gallon or liters per 100 km from distance and fuel used.
Open calculatorGeneral and Scientific Calculator
Use a fast general calculator or switch on scientific functions for trigonometry, logarithms, powers, roots, memory, and calculation history.
Open calculatorGolden Ratio Calculator
Golden ratio calculator: phi times a number.
Open calculatorHELOC Calculator
Estimate the monthly payment and total cost of a home equity line of credit.
Open calculatorHEX to RGB Converter
Convert any hex color code to its red, green, and blue (RGB) values instantly, in the browser.
Open calculatorHeat Index Calculator
Calculate the apparent (feels-like) temperature from air temperature and humidity.
Open calculatorHeron's Formula Calculator
Heron's formula calculator: triangle area from three sides.
Open calculatorHexagon Calculator
Hexagon calculator: area and perimeter of a regular hexagon.
Open calculatorIRR Calculator
Calculate the internal rate of return from a series of cash flows.
Open calculatorInvestment Return Calculator
Calculate total return and annualized (CAGR) return on an investment.
Open calculatorJet Lag Adjustment Calculator
Jet lag adjustment calculator: estimated days to adjust after crossing time zones.
Open calculatorLaw of Cosines Calculator
Law of cosines calculator: third side from two sides and angle.
Open calculatorLine Intersection Calculator
Line intersection calculator: where two lines cross.
Open calculatorLinear Equation Solver
Linear equation solver: ax + b = c.
Open calculatorLinear Interpolation Calculator
Linear interpolation calculator: estimate y between two points.
Open calculatorLogarithm Calculator
Calculate the logarithm of a number in any base, or natural log.
Open calculatorMarkdown Table Generator
Paste rows and columns of text and get a clean GitHub-flavored markdown (GFM) pipe table you can drop into READMEs and docs.
Open calculatorMatrix Calculator
Add, subtract, or multiply 2x2 and 3x3 matrices.
Open calculatorMatrix Determinant Calculator
3x3 matrix determinant calculator.
Open calculatorMatrix Transpose Calculator
Matrix transpose calculator: flip a 2x3 matrix.
Open calculatorMean Median Mode Calculator
Calculate mean, median, mode, range, sum, and count for any list of numbers.
Open calculatorModulo Calculator
Modulo calculator: remainder of a divided by b.
Open calculatorNatural Log Calculator
Natural log calculator: ln(x) and e^x.
Open calculatorNet Worth Calculator
Add up your assets and liabilities to find your net worth.
Open calculatorNth Root Calculator
Nth root calculator: the n-th root of a number.
Open calculatorNumbers to Words Converter
Convert any whole number into English words , for checks, contracts, and homework.
Open calculatorOhm's Law Calculator
Calculate voltage, current, resistance, or power using Ohm's law.
Open calculatorOne Rep Max Calculator
Estimate your one-rep max from a submaximal lift.
Open calculatorOrder of Operations Calculator (PEMDAS)
Evaluate math expressions with the correct order of operations (PEMDAS): parentheses, exponents, multiplication and division, then addition and subtraction.
Open calculatorOvulation Calculator
Estimate your fertile window and ovulation date based on cycle length and last period.
Open calculatorPaint Cost Per Square Foot Calculator
Estimate paint cost per square foot or the total to paint a room from your own rate.
Open calculatorParallelogram Area Calculator
Parallelogram area calculator: area from base and height.
Open calculatorPayPal Fee Calculator
Calculate estimated PayPal fees, net proceeds, or the amount to charge for a target net. Starts with an editable 3.49% + $0.49 planning preset.
Open calculatorPension Calculator
Estimate a monthly pension benefit from salary, years of service, and a multiplier.
Open calculatorPercent Difference Calculator
Percent difference calculator: relative difference between two values.
Open calculatorPercentage Change Calculator
Percentage change calculator: the % increase or decrease between two values.
Open calculatorPercentage Markup Calculator
Enter a cost and markup percentage to get the selling price, markup amount, and profit margin. What is a 15% markup on $85? It is $97.75.
Open calculatorPercentile Calculator
Find the value at any percentile in a data set, or the percentile rank of a given value. Enter your data and the percentile you need.
Open calculatorPermutations Calculator (nPr)
Calculate the number of permutations (nPr) of arranging r items from n, with the formula explained.
Open calculatorPolynomial Evaluator
Polynomial evaluator: evaluate ax² + bx + c at x.
Open calculatorPresent Value Calculator
Find what a future lump sum is worth today at a given discount rate.
Open calculatorPrice Per Square Foot Calculator
Work out price per square foot, or back into total price or area from a rate and budget.
Open calculatorPrime Checker
Prime checker: is a number prime, with factors.
Open calculatorPrize Wheel Spinner
Spin a prize wheel to randomly choose a winner from segments you add. Local browser randomness, no upload.
Open calculatorProportion Solver
Proportion solver: solve a/b = c/d for the unknown.
Open calculatorPythagorean Theorem Calculator
Find the missing side of a right triangle using a² + b² = c².
Open calculatorQuadratic Formula Calculator
Solve a quadratic equation ax² + bx + c = 0 and see the roots.
Open calculatorQuartile Calculator
Calculate the first (Q1), second (median/Q2), and third (Q3) quartiles plus the interquartile range (IQR) of a data set.
Open calculatorRMD Calculator
Estimate the Required Minimum Distribution from a retirement account at age 73+.
Open calculatorRandom Name Picker
Draw one name from a list of names you enter, using unbiased local browser randomness. Add names one per line, then pick.
Open calculatorRandom Number Generator
Generate one or up to 100 random integers from a custom range using unbiased local browser randomness.
Open calculatorRandom Team Splitter
Split any list of names into balanced random teams instantly. Choose team count or members per team — runs entirely in your browser.
Open calculatorRegex Tester
Test a regular expression pattern against a string, see highlighted matches and a live match count, all in your browser.
Open calculatorRemainder Calculator
Remainder calculator: quotient and remainder of a division.
Open calculatorRoad Trip Time Calculator
Road trip time calculator: drive time and arrival from distance, speed, and stops.
Open calculatorRoth IRA Calculator
Estimate the future value of a Roth IRA with annual contributions and tax-free growth.
Open calculatorRound Up Down Calculator
Round up/down calculator: nearest multiple in both directions.
Open calculatorRounding Numbers Calculator
Round any number to the nearest ten, one, tenth, hundredth, or thousandth , with every place shown at once.
Open calculatorSample Size Calculator
Determine the sample size needed for a survey or study at a given confidence and margin.
Open calculatorSemicircle Calculator
Semicircle calculator: area and arc length.
Open calculatorSeptic Tank Size Calculator
Estimate a septic tank size in gallons from the number of bedrooms and daily usage assumptions.
Open calculatorSeries Sum Calculator
Arithmetic series sum calculator: a1 + (a1+d) + ...
Open calculatorSimple Interest Calculator
Calculate simple interest and total amount with interest using principal, annual rate, and time. Simple interest applies only to the original principal.
Open calculatorSimplify Fractions Calculator
Reduce any fraction to lowest terms with the GCD shown, plus decimal and mixed-number forms.
Open calculatorSlope Intercept Calculator
Slope intercept calculator: y = mx + b from two points.
Open calculatorSocial Media Engagement Rate Calculator
Calculate engagement rate from likes, comments, shares, and reach or followers, and compare against typical benchmarks.
Open calculatorSonotube Concrete Calculator
Estimate concrete for a round sonotube column in cubic feet, cubic yards, and 60/80 lb bags.
Open calculatorSphere Volume Calculator
Sphere volume calculator: volume and surface area from radius.
Open calculatorStandard Deviation Calculator
Calculate the sample or population standard deviation, variance, mean, and margin of error for any set of numbers.
Open calculatorStandard Error Calculator
Calculate the standard error of the mean (SEM). Enter sample standard deviation and size to measure how precise the sample mean is.
Open calculatorStatistics Calculator
Compute descriptive statistics for a sample or population: mean, median, mode, range, sum, count, standard deviation, variance, and geometric mean.
Open calculatorStripe Fee Calculator
Calculate estimated Stripe fees, net proceeds, or the amount to charge for a target net. Starts with an editable 2.9% + $0.30 planning preset.
Open calculatorSun & Moon Planner
Estimate sunrise, sunset, twilight, daylight, moon phase, moonrise, and moonset for a date and coordinates.
Open calculatorSunrise Sunset Calculator
Sunrise sunset calculator: sunrise, sunset, and daylight hours for any city today plus the next week.
Open calculatorSurface Area Calculator
Calculate the surface area of common 3D shapes.
Open calculatorTimezone Converter
Convert a time between cities and time zones worldwide with automatic daylight saving adjustment. Compare multiple zones at once, privately, no account.
Open calculatorTip & Bill Split Calculator
Calculate a tip, split a bill evenly, and make rounding choices explicit.
Open calculatorTrapezoid Area Calculator
Trapezoid area calculator: area from bases and height.
Open calculatorTriangle Calculator
Solve any triangle from its three sides: area, angles, height, inradius, circumradius, and perimeter.
Open calculatorTrig Calculator
Trig calculator: sine, cosine, tangent of an angle.
Open calculatorUS Weather Forecast
Official National Weather Service forecast for US latitude and longitude coordinates. Enter exact coords for the authoritative federal NWS forecast, hourly a.
Open calculatorUsername Scrambler
Generate randomized but memorable username ideas from your real name or email prefix, entirely in your browser.
Open calculatorVariance Calculator
Calculate sample or population variance from a data set. Enter values to see variance, standard deviation, and the sum of squared deviations.
Open calculatorVoltage Drop Calculator
Estimate voltage drop in a wire run based on length, current, and wire gauge.
Open calculatorVolume Calculator
Calculate the volume of common 3D shapes.
Open calculatorWeather Lookup
Current weather and 7-day forecast for any city worldwide. Temperature, feels-like, precipitation, wind, and UV from Open-Meteo. Private, no account.
Open calculatorWeighted Average Calculator
Calculate a weighted average (weighted mean). Enter values and weights to combine scores or grades that count differently.
Open calculatorZ-Score Calculator
Calculate the z-score (standard score) for a value. Enter the raw score, mean, and standard deviation to see how many SDs above or below the mean it sits.
Open calculatorFinance & Investing 107
1099 Income Tax Calculator
Estimate federal self-employment tax and a quarterly planning amount for 1099 income.
Open calculator401k Employer Match Calculator
Estimate employee contributions, employer match, unclaimed match, and per-paycheck amounts.
Open calculator50 30 20 Budget Calculator
50/30/20 budget calculator: split after-tax income into needs, wants, and savings.
Open calculator529 College Savings Calculator
529 college savings calculator: projected value of monthly contributions.
Open calculatorAPR & Effective Interest Calculator
Estimate payment, fee-adjusted APR, effective annual rate, and total finance cost.
Open calculatorAPY Calculator
Convert a nominal annual interest rate and compounding frequency into annual percentage yield.
Open calculatorAfter Repair Value Calculator
Estimate after-repair value (ARV) of a fix-and-flip property using comparable sales. Enter comps and see the blended estimate.
Open calculatorAnnuity Payout Calculator
Annuity payout calculator: monthly income from a lump sum at a fixed rate.
Open calculatorAuto Loan Calculator
Estimate an auto loan payment, amount financed, total interest, and year-by-year balance.
Open calculatorAverage Share Cost Calculator
Calculate weighted average share cost, total shares, cost basis, and unrealized gain.
Open calculatorBalance Transfer Savings Calculator
Compare keeping credit-card debt with transferring it to a promotional APR after fees.
Open calculatorBalloon Payment Calculator
Balloon payment calculator: monthly payment plus final balloon balance.
Open calculatorBoat Loan Calculator
Boat loan calculator: boat and RV loan payment.
Open calculatorBreak-Even Ratio Calculator
Calculate the break-even ratio for a rental property. See what share of income is consumed before cash flow turns positive.
Open calculatorBudget Planner Calculator
Budget planner calculator: monthly income minus fixed costs and spending.
Open calculatorBusiness Loan Calculator
Business loan calculator: SBA-style loan payment.
Open calculatorCAGR Calculator
Calculate compound annual growth rate from starting value, ending value, and elapsed years.
Open calculatorCap Rate Calculator
Calculate the capitalization rate on a rental property. Enter property value and net operating income (NOI) for unlevered yield.
Open calculatorCapital Gains Calculator
Capital gains calculator: tax on an asset sale from sell price, cost basis, and your capital gains rate.
Open calculatorCash-on-Cash Return Calculator
Calculate cash-on-cash return on a rental property. Enter annual cash flow and total cash invested for yield on the cash you put in.
Open calculatorChild Care Cost Calculator
Child care cost calculator: annual cost of daycare or nanny care.
Open calculatorClosing Cost Calculator
Estimate closing costs on a home purchase. Enter price, down payment, and typical fee percentages for an itemized total.
Open calculatorCollege Cost Calculator
College cost calculator: four-year total cost with tuition inflation.
Open calculatorCompound Interest Calculator
Calculate compound interest with recurring contributions.
Open calculatorCredit Card Payoff Calculator
Estimate credit-card payoff time and interest from balance, APR, and monthly payment.
Open calculatorCredit Utilization Calculator
Credit utilization calculator: credit score impact from balances vs limits.
Open calculatorCrypto Profit Calculator
Calculate crypto profit and ROI with fees.
Open calculatorDCA Investment Calculator
Estimate recurring-investment growth, contributions, and gains using monthly compounding.
Open calculatorDSCR Calculator
Calculate the debt service coverage ratio (DSCR) for a rental property. Enter net operating income and annual debt service.
Open calculatorDebt Avalanche Calculator
Debt avalanche calculator: pay off highest-interest debt first to minimize interest.
Open calculatorDebt Consolidation Calculator
Debt consolidation calculator: current debts vs one consolidation loan.
Open calculatorDebt Free Date Calculator
Debt free date calculator: payoff timeline at a monthly payment.
Open calculatorDebt Payoff Calculator
Estimate one debt's payoff timeline and compare a fixed payment with an extra-payment scenario.
Open calculatorDebt Snowball Calculator
Debt snowball calculator: pay off debts smallest-first with extra payments.
Open calculatorDebt-to-Income Ratio Calculator
Calculate your front-end and back-end DTI ratio from monthly income, housing, and debt payments. Free, private, no signup.
Open calculatorDividend Reinvestment Calculator
Estimate portfolio growth when dividends are reinvested with editable yield and price growth.
Open calculatorDividend Yield Calculator
Dividend yield calculator: yield from annual dividends per share and price, plus income for your shares.
Open calculatorDown Payment Calculator
Calculate your down payment, loan amount, closing costs, and cash needed to close in percent or dollar-amount mode.
Open calculatorEBITDA Calculator
EBITDA calculator: earnings before interest, taxes, depreciation, amortization.
Open calculatorEOQ Calculator
EOQ calculator: economic order quantity for inventory.
Open calculatorEmergency Fund Calculator
Estimate an emergency-fund target, current gap, and time needed to reach it.
Open calculatorEstate Tax Calculator
Estate tax calculator: federal estate tax above the lifetime exemption.
Open calculatorFHA Loan Calculator
FHA loan calculator: payment with mortgage insurance premium (MIP).
Open calculatorFSA Calculator
FSA calculator: tax savings and what you risk with use-it-or-lose-it.
Open calculatorFederal Income Tax Calculator
Federal income tax calculator: 2026 federal brackets with standard deduction.
Open calculatorFix and Flip Profit Calculator
Project full profit on a fix-and-flip. Enter purchase, rehab, holding and selling costs, and after-repair value.
Open calculatorFuture Value Calculator
Project the future value of a starting balance and recurring monthly contributions.
Open calculatorGDP Calculator
GDP calculator: gross domestic product from consumption, investment, government, and net exports.
Open calculatorGift Tax Calculator
Gift tax calculator: taxable gifts above the annual exclusion.
Open calculatorGold, Silver & Precious Metals Price Calculator
Live gold, silver, platinum, and palladium spot prices plus a precious-metals and rare-earth element lookup with atomic numbers, weights, and uses.
Open calculatorGross Margin Calculator
Gross margin calculator: profit margin and markup from revenue and cost of goods sold.
Open calculatorGross Rent Multiplier Calculator
Calculate the gross rent multiplier (GRM). Enter property price and annual rent for the 10-second income screen.
Open calculatorGross Up Calculator
Gross up calculator: convert a net pay or budget target to gross pay including taxes.
Open calculatorHSA Tax Savings Calculator
HSA tax savings calculator: what an HSA contribution saves you in federal income tax.
Open calculatorInflation Impact Calculator
Model future cost and purchasing-power erosion from an editable constant annual inflation assumption.
Open calculatorInterest Only Loan Calculator
Interest-only loan calculator: IO payments then full amortization.
Open calculatorInterest Rate Calculator
Interest rate calculator: solve for the rate between present and future value.
Open calculatorInvestment Fee Calculator
Investment fee calculator: the real cost of annual fees on long-term returns.
Open calculatorInvestment Growth Calculator
Investment growth calculator: future value with monthly contributions and compound interest.
Open calculatorLoan Comparison Calculator
Compare monthly payment, total interest, and total cost for two fixed-rate loans.
Open calculatorLoan-to-Value Calculator
Calculate your loan-to-value (LTV) ratio. Enter loan amount and property value to see equity position and PMI risk.
Open calculatorLocal Income Tax Calculator
Local income tax calculator: which states levy county or city income taxes.
Open calculatorLump Sum Vs Dca Calculator
Compare investing a lump sum now versus dollar-cost averaging the same money monthly. See which strategy wins at your time horizon and return.
Open calculatorMarket Cap Calculator
Market cap calculator: company value from shares and price.
Open calculatorMaximum Allowable Offer Calculator
Calculate the maximum allowable offer (MAO) for a flip using the 70% rule. Enter ARV, rehab, and holding costs.
Open calculatorMortgage Affordability Calculator
Find an affordable home price from income, debts, down payment, rate, taxes, insurance, HOA, and your DTI cap.
Open calculatorMortgage Escrow Calculator
Mortgage escrow calculator: monthly escrow payment from annual property tax and insurance.
Open calculatorMortgage Overpayment Calculator
See how extra monthly payments or a one-time lump sum cut years off a mortgage and save interest. Enter loan, rate, term, and overpayments for a private estimate.
Open calculatorMortgage Payment Calculator
Estimate your monthly mortgage payment including principal, interest, taxes, and insurance. Enter loan amount, rate, and term for a full breakdown. Private.
Open calculatorMortgage Payoff Calculator
Mortgage payoff calculator: payoff date and interest saved with extra payments.
Open calculatorMortgage Refinance Break-Even Calculator
Compare old and new mortgage payments and estimate refinance break-even time.
Open calculatorNet Operating Income Calculator
Calculate net operating income (NOI) for a rental property. Enter rental income and operating expenses, before the mortgage.
Open calculatorNet Present Value Calculator
Net present value calculator: NPV of a yearly cash flow at a discount rate.
Open calculatorPE Ratio Calculator
PE ratio calculator: price-to-earnings from price and EPS.
Open calculatorPaycheck After Tax Calculator
Estimate 2026 federal and FICA withholding with clearly labeled state planning estimates.
Open calculatorPayout Ratio Calculator
Payout ratio calculator: dividends as a share of earnings.
Open calculatorPercentage Calculator
Calculate percentages, increases, and changes instantly.
Open calculatorPersonal Loan Calculator
Personal loan calculator: monthly payment with origination fee.
Open calculatorPrice-to-Rent Ratio Calculator
Calculate the price-to-rent ratio. Enter home price and annual rent to see the classic buy-vs-rent market signal.
Open calculatorReal Estate Cash Flow Calculator
Estimate your monthly real estate cash flow. Enter rental income and all operating costs to see positive or negative cash flow. Private.
Open calculatorRent Affordability Calculator
Estimate affordable rent using your income, chosen cap, debt, and savings. Your suggested maximum is the lower of the income cap or cash available.
Open calculatorRent Split Calculator
Rent split calculator: divide rent fairly by each roommate's income.
Open calculatorRent vs. Buy Calculator
Compare modeled buyer equity with a renter investment portfolio using explicit monthly cash flows.
Open calculatorRent-to-Value Calculator
Calculate the rent-to-value ratio and the 1% rule. Enter property value and monthly rent to screen a rental fast.
Open calculatorRental Property ROI Calculator
Estimate total return on a rental property. Combine cash flow, loan paydown, and appreciation over your holding period.
Open calculatorRental Yield Calculator
Calculate gross rental yield. Enter property price and annual rent for the quick first-pass screen on a rental.
Open calculatorRetirement Planning Calculator
Project retirement savings, inflation-adjusted value, contributions, and a planning withdrawal estimate.
Open calculatorRetirement Withdrawal Calculator
Retirement withdrawal calculator: safe annual and monthly withdrawals from a portfolio using the 4% rule.
Open calculatorReturn on Investment Calculator
Return on investment calculator: ROI from cost and gain.
Open calculatorRule of 72 Calculator
Rule of 72 calculator: how many years to double your money at a given rate.
Open calculatorSalary Raise Calculator
Convert a pay raise into new annual, monthly, weekly, and hourly compensation.
Open calculatorSales Tax Calculator
Sales tax calculator: state base rate and total on a purchase.
Open calculatorSales Tax by ZIP Code
Sales tax by ZIP code: see the candidate states, base rate, and local ceiling for any US ZIP.
Open calculatorSavings Goal Calculator
Calculate the monthly deposit needed to reach a savings goal with an editable APY and deadline.
Open calculatorSavings Growth Calculator
Savings calculator for monthly compound growth. Enter an amount, annual rate, and years to estimate your future savings value.
Open calculatorShare Profit Calculator
Calculate stock profit, ROI, and per-share returns.
Open calculatorSocial Security Break Even Calculator
Social security break-even calculator: at what age claiming later pays off vs claiming at 62.
Open calculatorSocial Security Tax Calculator
Social Security tax calculator: how much of your benefit is taxable (50% or 85% rule).
Open calculatorStock Return Calculator
Stock return calculator: total return including dividends.
Open calculatorStudent Loan Payoff Calculator
Student loan payoff calculator: estimate your payoff months and see whether your monthly payment covers student loan interest.
Open calculatorSubscription Cost Calculator
Subscription cost calculator: the real annual cost of your recurring subscriptions.
Open calculatorT-Bill Yield Calculator
T-Bill yield calculator: discount yield from face value, price, and days to maturity.
Open calculatorTerm Life Insurance Calculator
Term life insurance calculator: coverage need using the DIME method.
Open calculatorUnit Price Calculator
Unit price calculator: price per unit to compare package sizes.
Open calculatorVA Mortgage Calculator
VA mortgage calculator: VA loan with funding fee, no PMI.
Open calculatorVacancy Rate Impact Calculator
Stress-test rental cash flow against vacancy. Enter normal cash flow and vacancy rate to see how lost rent eats your return.
Open calculatorWash Sale Calculator
Wash sale calculator: disallowed loss and adjusted basis after a repurchase.
Open calculatorFood & Cooking 33
Air Fryer Time Calculator
Air fryer time calculator: temp and time by food.
Open calculatorAlcohol Dilution Calculator
Alcohol dilution calculator: find how much water to add to bring spirits or concentrates to a target ABV.
Open calculatorBaking Ratio Calculator
Baking ratio calculator: scale ingredients by baker's percentage or classic ratios (e.g., 3:2:1 pastry).
Open calculatorBeer ABV Calculator
Beer ABV calculator: alcohol by volume from original and final gravity.
Open calculatorCaffeine Intake Calculator
Caffeine intake calculator: total daily caffeine from coffee, tea, energy drinks, and soda.
Open calculatorCandy Temperature Calculator
Candy temperature calculator: sugar stages from temperature.
Open calculatorCoffee Cost Calculator
Coffee cost calculator: what your daily coffee habit really costs per year.
Open calculatorCoffee Ratio Calculator
Coffee ratio calculator: grams of coffee for water and ratio.
Open calculatorCooking Time Calculator
Cooking time calculator: estimate oven or roasting time from weight and minutes-per-pound method.
Open calculatorEgg Boil Time Calculator
Egg boil time calculator: doneness from boiling minutes.
Open calculatorFood Cost Calculator
Food cost calculator: ingredient cost per serving and food-cost percentage for menu pricing.
Open calculatorFood Safety Temperature Calculator
Food safety temperature calculator: safe internal temperatures.
Open calculatorFood Storage Time Calculator
Food storage time guide: safe refrigerator and freezer storage times for common foods.
Open calculatorGrams to Cups Calculator
Grams to cups calculator: weight to volume by ingredient density.
Open calculatorKombucha Brew Calculator
Kombucha brew calculator: tea, sugar and starter for a batch.
Open calculatorMeal Prep Calculator
Meal prep calculator: batch quantity for meal prep.
Open calculatorMeat Cooking Time Calculator
Meat cooking time calculator: roast time by weight and type.
Open calculatorMeat Doneness Temperature Calculator
Meat doneness temperature guide: target internal temperatures for beef, pork, chicken, and lamb.
Open calculatorNet Carbs Calculator
Net carbs calculator: carbs minus fiber and sugar alcohols.
Open calculatorOven Conversion Calculator
Oven conversion calculator: conventional to convection.
Open calculatorOven Temperature Converter
Oven temperature converter: Fahrenheit, Celsius, and UK gas marks.
Open calculatorPizza Dough Calculator
Pizza dough calculator: flour, water, salt, yeast by baker's percentage.
Open calculatorPortion Size Calculator
Portion size calculator: scale a recipe's serving size to a new number of portions.
Open calculatorPressure Cooker Time Calculator
Pressure cooker time calculator: cooking times for common foods.
Open calculatorRecipe Divider Calculator
Recipe divider calculator: split a recipe into fractions (half, third, quarter) with each ingredient scaled.
Open calculatorRice Water Ratio Calculator
Rice water ratio calculator: water per cup of rice by type.
Open calculatorSmoker Time Calculator
Smoker time calculator: smoking time by cut at 225°F.
Open calculatorSoup Scale Calculator
Soup scale calculator: scale a soup or stock recipe from a base yield to a target yield.
Open calculatorSourdough Hydration Calculator
Sourdough hydration calculator: dough hydration percentage.
Open calculatorSous Vide Time Calculator
Sous vide time calculator: cooking time by cut and thickness.
Open calculatorSteak Doneness Calculator
Steak doneness calculator: internal temperature guide.
Open calculatorTea Steep Calculator
Tea steep calculator: water temperature and time by tea type.
Open calculatorTsp to Tbsp Converter
Tsp to tbsp converter: teaspoons, tablespoons, cups, ml.
Open calculatorGaming 15
Betting Odds Converter
Betting odds converter: American, decimal, and fractional odds with implied probability.
Open calculatorChess Elo Calculator
Chess Elo calculator: expected score and new rating after a game using the standard Elo formula.
Open calculatorDPS Calculator
DPS calculator: damage per second from average hit damage and attack rate.
Open calculatorFPS Sensitivity Converter
FPS sensitivity converter: convert mouse sensitivity between games and calculate eDPI and cm/360.
Open calculatorGacha Pity Calculator
Gacha pity calculator: honest odds of pulling the featured item within N pulls.
Open calculatorKD Ratio Calculator
KD ratio calculator: kill/death ratio from kills, deaths, and matches played.
Open calculatorKelly Criterion Calculator
Kelly criterion calculator: optimal bet size from win probability and decimal odds.
Open calculatorLoot Box EV Calculator
Loot box expected value calculator: what a box is really worth from drop odds and item values.
Open calculatorLoot Drop Probability Calculator
Loot drop probability calculator: chance of at least one drop after N attempts at a given drop rate.
Open calculatorLottery Odds Calculator
Lottery odds calculator: jackpot odds for any 5+1 or 6-number game.
Open calculatorParlay Odds Calculator
Parlay odds calculator: combined odds and implied probability for multi-leg bets.
Open calculatorRaffle Odds Calculator
Raffle odds calculator: win probability from tickets you hold vs total sold.
Open calculatorWin Streak Probability Calculator
Win streak probability calculator: odds of winning N games in a row.
Open calculatorXP Level Calculator
XP level calculator: total XP needed and progress percentage toward the next level.
Open calculatorXP to Level Calculator
XP-to-level calculator: experience needed for the next level on linear or quadratic curves.
Open calculatorGenerators 10
Business Name Generator
Generate business and brand name ideas from your industry and style — privacy-clean, no sign-up.
Open generatorDad Joke Generator
Generate groan-worthy dad jokes and one-liners by category — instantly, right in your browser.
Open generatorLogarithm Calculator
Logarithm calculator: log base 10, 2, e, or any custom base of a number, with the inverse check.
Open generatorPayment Terms Generator
Draft plain-language payment terms for invoices, quotes, retainers, deposits, late fees, and due dates.
Open generatorProduct Description Generator
Generate a ready-to-use product description from your product, benefit, feature, and audience.
Open generatorQR Code Generator
Generate a QR code and download a PNG.
Open generatorQuote / Estimate Generator
Create a simple service quote or estimate with line items, taxes, deposits, payment terms, and a copyable client summary.
Open generatorRandom Quote Generator
Get random motivational and wisdom quotes by topic, instantly and without an account.
Open generatorReceipt Generator
Create a simple payment receipt with payer, seller, items, tax, payment method, and a copyable receipt summary.
Open generatorSlogan Generator
Generate brand slogan and tagline ideas from your business, benefit, and industry.
Open generatorGeography 9
Atmospheric Pressure Calculator
Atmospheric pressure calculator: barometric pressure at elevation (US standard atmosphere).
Open calculatorBearing Calculator
Bearing calculator: initial compass bearing between two coordinates.
Open calculatorCoordinate Converter
Coordinate converter: convert between decimal degrees and degrees/minutes/seconds.
Open calculatorDistance Between Coordinates Calculator
Distance between coordinates calculator: great-circle distance (haversine) between two latitude/longitude points.
Open calculatorGeographic Area Calculator
Geographic area calculator: approximate rectangle area on the globe from corner coordinates.
Open calculatorHumidity Index Calculator
Humidity index calculator: humidex feels-like value from temperature and dew point.
Open calculatorPopulation Density Calculator
Population density calculator: people per square kilometer or mile from population and area.
Open calculatorWet Bulb Temperature Calculator
Wet bulb temperature calculator: wet-bulb from temperature and humidity (Stull 2011).
Open calculatorWind Chill Calculator
Wind chill calculator: feels-like temperature from air temperature and wind speed.
Open calculatorHealth 63
A1c Calculator
A1c calculator: estimated average glucose from HbA1c.
Open calculatorBMI Calculator
Calculate BMI quickly and privately in your browser.
Open calculatorBMR & TDEE Calculator
Estimate adult BMR and TDEE from the Mifflin-St Jeor equation and an explicit activity multiplier.
Open calculatorBaby Formula Calculator
Baby formula calculator: ounces per feeding from baby weight.
Open calculatorBlood Alcohol Content Calculator
Blood alcohol content (BAC) calculator: Widmark estimate from drinks, weight, and time \u2014 informational only.
Open calculatorBlood Pressure Category Calculator
Blood pressure category calculator: classify a systolic/diastolic reading using the AHA categories.
Open calculatorBlood Sugar Converter
Blood sugar converter: convert glucose between mg/dL and mmol/L instantly.
Open calculatorBody Fat Estimate Calculator
Estimate adult body-fat percentage with the U.S. Navy circumference method and clear limitations.
Open calculatorBody Surface Area Calculator
Body surface area calculator: Mosteller formula from height and weight.
Open calculatorBra Size Calculator
Bra size calculator: band and cup size from underbust and bust measurements.
Open calculatorCaffeine Half-Life Calculator
Caffeine half-life calculator: how much caffeine remains in your system over time.
Open calculatorCalorie Calculator
Estimate daily calories and macros from simple inputs.
Open calculatorCalorie Deficit Calculator
Calorie deficit calculator: weight-loss timeline from daily deficit and target pounds.
Open calculatorCalorie Target Calculator
Calorie target calculator: maintenance, deficit, and surplus targets from weight, height, age, and activity.
Open calculatorCholesterol Ratio Calculator
Cholesterol ratio calculator: total-to-HDL and LDL-to-HDL ratios from a lipid panel.
Open calculatorConception Calculator
Conception calculator: conception date and fertility window from due date.
Open calculatorCycling Calories Calculator
Cycling calories calculator: calories burned cycling by weight and time.
Open calculatorDaily Water Intake Calculator
Daily water intake calculator: estimate hydration needs from body weight and activity.
Open calculatorFasting Window Calculator
Fasting window calculator: eating window from fast start and length.
Open calculatorFetal Weight Calculator
Fetal weight calculator: estimated baby weight from ultrasound (Hadlock).
Open calculatorFrame Size Calculator
Frame size calculator: small, medium, or large body frame from wrist.
Open calculatorGFR Calculator
eGFR calculator (CKD-EPI 2021): estimated kidney filtration rate from creatinine, age, and sex.
Open calculatorGestational Age Calculator
Gestational age calculator: weeks pregnant and due date from last period.
Open calculatorGym Cost Per Visit Calculator
Gym cost per visit calculator: is your membership actually worth it?
Open calculatorHeart Rate Recovery Calculator
Heart rate recovery calculator: HR drop after exercise.
Open calculatorHeart Rate Zones Calculator
Heart rate zones calculator: target training zones from age and resting heart rate, computed locally.
Open calculatorIdeal Weight Calculator
Estimate your ideal body weight using seven common formulas (Hamwi, Devine, Robinson, Miller, Broca, Lorentz, Peterson) plus a healthy BMI range.
Open calculatorIntermittent Fasting Calculator
Intermittent fasting calculator: convert between eating windows and fasting hours.
Open calculatorLean Body Mass Calculator
Lean body mass calculator: LBM from weight and height (Boer).
Open calculatorMacro Planning Calculator
Allocate a user-selected adult calorie total across configurable protein, fat, and carbohydrate assumptions.
Open calculatorMacro Split Calculator
Macro split calculator: carbs from calories, protein, and fat targets.
Open calculatorMaintenance Calories Calculator
Maintenance calories calculator: calories to hold your weight (Mifflin-St Jeor).
Open calculatorMean Arterial Pressure Calculator
Mean arterial pressure calculator: MAP from systolic and diastolic.
Open calculatorMedicine Dosage Calculator
Medicine dosage calculator: dose from body weight and mg/kg dosing instructions.
Open calculatorMenstrual Cycle Calculator
Menstrual cycle calculator: next period and estimated fertile window (private, no tracking stored).
Open calculatorMetabolic Age Calculator
Metabolic age calculator: how your BMR compares to your age group.
Open calculatorPace Calculator
Calculate your running pace per km or mile from distance and time, plus speed and predicted race times.
Open calculatorPeriod Cycle Calculator
Period cycle calculator: estimate the next period and fertile window from cycle length.
Open calculatorPollen Forecast Calculator
Pollen forecast calculator: current pollen levels for any city.
Open calculatorPregnancy Calculator
Estimate your pregnancy due date and current week from your last period, conception date, or a known due date. Private, no account.
Open calculatorPregnancy Due Date Calculator
Pregnancy due date calculator: estimate the due date from the first day of the last menstrual period.
Open calculatorPregnancy Weight Gain Calculator
Pregnancy weight gain calculator: IOM recommended ranges by BMI and week.
Open calculatorProtein Shake Calculator
Protein shake calculator: protein per shake from scoops.
Open calculatorPulse Pressure Calculator
Pulse pressure calculator: the gap between systolic and diastolic.
Open calculatorSensitivity Specificity Calculator
Sensitivity and specificity calculator: diagnostic test performance.
Open calculatorSleep Cycle Calculator
Sleep cycle calculator: find ideal bedtimes that end on a 90-minute sleep cycle for your wake time.
Open calculatorSleep Cycle Calculator
Sleep cycle calculator: best bedtime to wake refreshed in 90-minute cycles.
Open calculatorSleep Debt Calculator
Sleep debt calculator: accumulated lost sleep from target hours, actual hours, and days tracked.
Open calculatorSleep Length Calculator
Sleep length calculator: hours and minutes from sleep cycles, plus when to wake.
Open calculatorSodium Calculator
Sodium calculator: mg sodium to salt grams and daily value.
Open calculatorSteps to Miles Calculator
Steps to miles calculator: distance walked and calories burned from step count.
Open calculatorStride Length Calculator
Stride length calculator: stride from height for walking or running.
Open calculatorSugar in Drinks Calculator
Sugar in drinks calculator: teaspoons and daily value from grams.
Open calculatorSunscreen SPF Calculator
Sunscreen SPF calculator: burn protection time and reapplication.
Open calculatorSwimming Calories Calculator
Swimming calories calculator: calories burned swimming by weight and time.
Open calculatorUV Exposure Calculator
UV exposure calculator: minutes until sunburn by UV index and Fitzpatrick skin type.
Open calculatorVO2 Max Calculator
VO2 max calculator: estimate aerobic fitness from a 12-minute run or resting heart rate.
Open calculatorVO2 Max Calculator
VO2 max calculator: estimate from a 12-minute Cooper test.
Open calculatorVitamin D Calculator
Vitamin D calculator: IU to mcg conversion with daily reference.
Open calculatorWaist Hip Ratio Calculator
Waist to hip ratio calculator: WHR and health risk category.
Open calculatorWaist to Height Ratio Calculator
Waist-to-height ratio calculator: assess abdominal obesity risk from waist and height.
Open calculatorWalking Calories Calculator
Walking calories calculator: calories burned walking by weight and time.
Open calculatorWeight Loss Timeline Calculator
Weight loss timeline calculator: how long a healthy weekly deficit will take.
Open calculatorMusic & Audio 14
Audio File Size Calculator
Audio file size calculator: uncompressed size from duration, sample rate, bit depth, and channels.
Open calculatorAudio Time Stretch Calculator
Calculate the new duration when audio playback speed changes.
Open calculatorBPM to MS Calculator
Convert beats per minute to milliseconds for note divisions used in music production.
Open calculatorChord Progression Generator
Chord progression generator: common diatonic progressions in any key, computed locally.
Open calculatorDelay Time Calculator
Delay time calculator: note-based delay milliseconds from BPM for quarter, eighth, dotted, and triplet notes.
Open calculatorEqualizer Q Calculator
Equalizer Q calculator: filter Q from center frequency and bandwidth, in Hz or octaves.
Open calculatorFrequency to Note Converter
Convert a sound frequency to its closest musical note with cents deviation.
Open calculatorKey Transposition Calculator
Transpose music between keys by semitones for any instrument or vocal range.
Open calculatorMetronome BPM Calculator
Convert traditional tempo markings to BPM and see milliseconds per beat.
Open calculatorMusic Interval Calculator
Music interval calculator: interval name and semitone distance between two notes.
Open calculatorScale Finder Calculator
Find the notes in any major, minor, pentatonic, blues, or modal scale from a root.
Open calculatorTempo Change Calculator
Tempo change calculator: new BPM after shifting pitch by semitones.
Open calculatorVinyl RPM Calculator
Calculate pitch change when a record plays at the wrong turntable speed.
Open calculatordB to Volume Ratio Calculator
Convert decibels to power or amplitude ratios for audio gain changes.
Open calculatorPets 9
Aquarium Stocking Calculator
Aquarium stocking calculator: fish capacity by tank size.
Open calculatorCat Age Calculator
Cat age calculator: cat years to human years.
Open calculatorCat Food Calculator
Cat food calculator: daily calories and cups from cat weight.
Open calculatorCat Litter Calculator
Cat litter calculator: litter needed for a multi-cat home.
Open calculatorDog Food Calculator
Dog food calculator: daily calories and cups from dog weight.
Open calculatorPet Annual Cost Calculator
Pet annual cost calculator: yearly dog or cat expenses.
Open calculatorPuppy Adult Weight Calculator
Puppy adult weight calculator: predicted adult weight from current age and weight.
Open calculatorPuppy Age Calculator
Dog age calculator: dog years to human years (AAHA method).
Open calculatorPuppy Breed Size Calculator
Puppy breed size calculator: adult weight by breed category.
Open calculatorPhoto & Video 12
Depth of Field Calculator
Depth of field calculator: estimate near and far focus limits from focal length, aperture, subject distance, and circle of confusion.
Open calculatorExposure Value Calculator
Exposure value calculator: EV from aperture, shutter speed, and ISO.
Open calculatorFlash Guide Number Calculator
Flash guide number calculator: solve guide number, aperture, or distance for flash photography.
Open calculatorFocal Length Calculator
Focal length calculator: estimate focal length from sensor width, subject distance, and field-of-view width.
Open calculatorFrame Rate Duration Calculator
Frame rate duration calculator: convert frames to seconds, minutes, or timecode at any frames-per-second rate.
Open calculatorImage File Size Calculator
Image file size calculator: uncompressed size from pixel dimensions, bit depth, and color mode.
Open calculatorLighting Ratio Calculator
Lighting ratio calculator: convert main-to-fill stops to a lighting ratio and light falloff.
Open calculatorMacro Magnification Calculator
Macro magnification calculator: reproduction ratio from extension tube and lens focal length.
Open calculatorPrint Size Calculator
Print size calculator: compute print dimensions and PPI from pixel dimensions and physical print size.
Open calculatorShutter Speed Stops Calculator
Shutter speed stops calculator: find how many exposure stops (EV) differ between two shutter speeds.
Open calculatorTimelapse Calculator
Timelapse calculator: frames and finished clip length from capture interval and duration.
Open calculatorVideo File Size Calculator
Video file size calculator: estimate file size from bitrate, resolution, frame rate, and duration.
Open calculatorPhysics 18
Acceleration Calculator
Calculate acceleration from the change in velocity over time.
Open calculatorAngular Momentum Calculator
Calculate angular momentum of a point mass from mass, velocity, and radius (L = mvr).
Open calculatorCylinder Volume Calculator
Cylinder volume calculator: volume of a cylinder from radius and height.
Open calculatorDensity Calculator
Calculate density from mass and volume (ρ = m/V) in kg/m³ and g/cm³.
Open calculatorForce Calculator
Calculate force, mass, or acceleration using Newton's second law (F = ma).
Open calculatorG Force Calculator
G force calculator: cornering acceleration from speed and radius.
Open calculatorHalf Life Calculator
Half life calculator: remaining amount after elapsed time with a known half-life.
Open calculatorKinetic Energy Calculator
Calculate the kinetic energy of a moving object from mass and velocity (KE = ½mv²).
Open calculatorMomentum Calculator
Calculate linear momentum from mass and velocity (p = mv).
Open calculatorPotential Energy Calculator
Calculate gravitational potential energy from mass, height, and gravity (PE = mgh).
Open calculatorPressure Calculator
Calculate pressure from force and area (P = F/A) with pascal and psi results.
Open calculatorResistor Color Code Calculator
Resistor color code calculator: 4-band resistor value and tolerance from color bands.
Open calculatorSpeed Distance Time Calculator
Speed distance time calculator: solve for the missing value (speed, distance, or time).
Open calculatorThermal Equilibrium Calculator
Calculate the final temperature when two objects reach thermal equilibrium.
Open calculatorVelocity Calculator
Calculate velocity from distance and time, with km/h and mph conversions.
Open calculatorWave Calculator
Calculate wave speed from frequency and wavelength (v = fλ).
Open calculatorWork Calculator
Work calculator: work done by a force over a distance (W = F \u00d7 d).
Open calculatorWork and Power Calculator
Calculate mechanical work (W = F·d) and power output (P = W/t).
Open calculatorReal Estate 11
1031 Exchange Calculator
1031 exchange calculator: capital gains tax deferred and any taxable boot in a like-kind exchange.
Open calculatorDSCR Calculator
Debt service coverage ratio calculator: net operating income against annual debt payments for rental properties.
Open calculatorHome Equity Calculator
Home equity calculator: your equity stake and loan-to-value ratio.
Open calculatorMarket Value Calculator
Estimate a property's market value from comparable price per square foot and quality adjustments.
Open calculatorProperty Area Calculator
Convert property and land area between square feet, square meters, acres, hectares, and square yards.
Open calculatorProperty Management Fee Calculator
Property management fee calculator: monthly and annual management fees plus a lease placement fee.
Open calculatorProperty Tax Calculator
Estimate annual property tax from assessed value, tax rate, and exemptions for budgeting.
Open calculatorProrated Rent Calculator
Prorated rent calculator: how much rent to charge for a partial month move-in or move-out.
Open calculatorRenovation Calculator
Estimate renovation return on investment by comparing project cost, value added, and resale assumptions.
Open calculatorRental Cash Flow Calculator
Rental cash flow calculator: monthly net cash flow after all costs.
Open calculatorVacancy Rate Calculator
Vacancy rate calculator: percentage of time a rental sits empty across a year.
Open calculatorSchool & Education 22
Arithmetic Sequence Calculator
Arithmetic sequence calculator: nth term and sum from first term and common difference.
Open calculatorAttendance Calculator
Attendance calculator: attendance percentage and days you can still miss to stay above a threshold.
Open calculatorBinary Calculator
Binary calculator: add, subtract, multiply, and divide binary numbers with decimal results.
Open calculatorDecimal to Fraction Calculator
Decimal to fraction calculator: convert a decimal to a simplified fraction.
Open calculatorDegree Progress Calculator
Degree progress calculator: completion percentage, remaining credits, and terms to finish.
Open calculatorFinal Exam Grade Calculator
See the exact score you need on your final exam to reach your desired course grade.
Open calculatorFraction to Decimal Calculator
Fraction to decimal calculator: numerator over denominator as a decimal and percent.
Open calculatorGPA Calculator
Calculate your GPA on a standard 4.0 scale from course letter grades and credits. Local, private, no upload.
Open calculatorGeometric Sequence Calculator
Geometric sequence calculator: nth term and sum from first term and ratio.
Open calculatorLong Division Calculator
Long division calculator: quotient and remainder with the steps shown.
Open calculatorMidpoint Calculator
Midpoint calculator: the midpoint of a line segment between two points.
Open calculatorPrime Factorization Calculator
Prime factorization calculator: prime factors with exponents for any number.
Open calculatorReading Speed Calculator
Reading speed calculator: words per minute and book reading time.
Open calculatorReading Time Calculator
Reading time calculator: how long a text takes to read at your words-per-minute pace.
Open calculatorRoot Calculator
Root calculator: the nth root of any number, including cube and fourth roots.
Open calculatorSchool Supply Budget Calculator
Estimate a back-to-school supply budget by grade level and number of children, including clothing, backpack extras, and estimated tax.
Open calculatorSemester GPA Calculator
Semester GPA calculator: grade point average from course credits and grade points.
Open calculatorSpeaking Time Calculator
Speaking time calculator: how long a script takes to say.
Open calculatorStudy Time Calculator
Study time calculator: hours per credit and per course versus the common 2-hours-per-credit rule.
Open calculatorTest Grade Calculator
Convert test points into a percentage and letter grade, and see the points needed for the next grade up.
Open calculatorTriangle Area Calculator
Triangle area calculator: area from base and height.
Open calculatorWeighted Grade Calculator
Weighted grade calculator: final grade from category scores and weights, with letter grade.
Open calculatorSeller & Business 27
Amazon Seller Fees Calculator
Free Amazon seller fee calculator: estimate referral, fulfillment, storage, and FBA fees plus net profit and margin , with editable 2026 assumptions.
Open calculatorBreak-Even Units Calculator
Find break-even units instantly: calculate contribution margin, required revenue, and units needed to cover costs and target profit.
Open calculatorCPM Calculator
Calculate CPM, campaign cost, impressions, or estimated ad revenue from pageviews and RPM. Any two values solve the third.
Open calculatorCash-Flow Runway Calculator
Model monthly cash runway, depletion month, lowest cash, and operating break-even from editable growth assumptions.
Open calculatorCommission Calculator
Calculate commission on sales using flat, threshold, or progressive tier rates. See total commission and a clear tier commission breakdown.
Open calculatorCustomer Lifetime Value Calculator
Calculate gross-contribution customer lifetime value, implied lifetime, and a planning CAC ceiling from your inputs and LTV:CAC target.
Open calculatorDepop Fee Calculator
Depop fee calculator: the 10% selling fee plus payment processing and your net.
Open calculatorEtsy Fee & Profit Calculator
Free Etsy fee calculator: estimate listing, transaction, and payment processing fees plus profit. Enter price and costs, see net earnings and margins. Privat.
Open calculatorFreelance Hourly Rate Calculator
Estimate a sustainable freelance hourly rate from income goals, expenses, taxes, and billable hours.
Open calculatorGumroad Fee Calculator
Gumroad fee calculator: the 10% creator fee plus payment processing.
Open calculatorInventory Reorder Point Calculator
Calculate your inventory reorder point: lead time demand plus safety stock, then see whether current stock means reorder now.
Open calculatorInvoice Generator
Create a simple invoice and download as PDF.
Open generatorInvoice Late Fee Calculator
Estimate a simple or monthly-compounded late fee from invoice balance, rate, and overdue time.
Open calculatorMarketplace Advertising Break-Even Calculator
Calculate break-even ROAS and ACOS after product cost, marketplace fees, payment fees, fulfillment, shipping, returns allowance, and target profit.
Open calculatorMercari Fee Calculator
Mercari fee calculator: the flat 10% selling fee and your net.
Open calculatorPayPal & Stripe Fee Calculator
Calculate PayPal and Stripe fees, net proceeds, or the amount to charge. Use editable presets for Stripe 2.9% + $0.30 and PayPal 3.49% + $0.49.
Open calculatorPercent Off Calculator
Calculate stacked percent-off discounts, apply a coupon, then add tax to see your final sale price.
Open calculatorPoshmark Fee Calculator
Poshmark fee calculator: selling fees and net for any sale price.
Open calculatorPrice Increase Impact Calculator
Compare revenue and contribution after a price change and expected unit-volume response.
Open calculatorProfit Margin and Markup Calculator
Calculate profit, profit margin, markup on cost, and the selling price needed for a target margin from your cost and price.
Open calculatorSales Tax and VAT Calculator
Sales tax calculator that adds or removes tax or VAT using your editable rate. Get the net amount, tax amount, and gross total instantly.
Open calculatorShopify Fee Calculator
Shopify fee calculator: monthly plan plus transaction fees on your sales volume.
Open calculatorShopify Profit Calculator
Free Shopify profit calculator: estimate payment processing, product, shipping, and ad costs plus net order profit and margin , with editable 2026 assumptions.
Open calculatorSquare Fee Calculator
Square fee calculator: the 2.6% + 10\u00a2 card-present fee and your net.
Open calculatorSubscription Churn Impact Calculator
Model customer and recurring-revenue trajectory from constant churn, acquisition, ARPU, and horizon assumptions.
Open calculatoreBay Fee Calculator
eBay fee calculator: final value fees and net proceeds for a sale including shipping.
Open calculatoreBay Fee and Profit Calculator
Free eBay fee calculator: estimate final value, per-order, and promoted-listing fees plus net profit and margin , with editable 2026 fee rates.
Open calculatorSocial Media 11
Engagement Rate Calculator
Calculate social media engagement rate from followers, likes, comments, and shares.
Open calculatorFacebook Ads Cost Calculator
Calculate Facebook ads CPM, CPC, CTR, and ROAS from campaign data.
Open calculatorFollower Growth Calculator
Project follower growth from starting audience, growth rate, and timeline.
Open calculatorHashtag Performance Calculator
Measure hashtag reach, impressions, and engagement rate.
Open calculatorInstagram Influencer Pricing Calculator
Calculate fair sponsored post rates from followers and engagement.
Open calculatorLove Compatibility Calculator
Love compatibility calculator: a fun, deterministic name-based score. Entertainment only.
Open calculatorPost Frequency Calculator
Plan a sustainable social posting cadence across platforms.
Open calculatorSocial Media Earnings Calculator
Estimate potential income from social platforms and sponsorship value.
Open calculatorTikTok Money Calculator
Estimate TikTok earnings from views and creator fund rate.
Open calculatorVideo Watch Time Calculator
Calculate total video watch hours from views and average duration.
Open calculatorYouTube Revenue Calculator
Estimate YouTube revenue from monthly views and RPM.
Open calculatorSports 23
Baseball OPS Calculator
Baseball OPS calculator: on-base percentage plus slugging percentage.
Open calculatorBatting Average Calculator
Batting average calculator: hits divided by at-bats.
Open calculatorBowling Handicap Calculator
Bowling handicap calculator: league handicap from average.
Open calculatorCycling Power to Weight Calculator
Cycling power-to-weight calculator: watts per kilogram for climbs and race grading.
Open calculatorEffective Field Goal Percentage Calculator
Effective field goal percentage calculator: eFG% that counts threes as 1.5 makes.
Open calculatorField Goal Probability Calculator
Field goal probability calculator: estimated make probability from kick distance.
Open calculatorGolf Club Distance Calculator
Golf club distance calculator: driver distance from swing speed.
Open calculatorGolf Handicap Calculator
Golf handicap calculator: handicap index from score, course rating, and slope.
Open calculatorGrip Strength Calculator
Grip strength calculator: handgrip rating by age and gender.
Open calculatorHiking Time Calculator
Hiking time calculator: Naismith\u2019s rule for distance and elevation gain.
Open calculatorMarathon Pace Predictor
Marathon pace predictor: race-time predictions from a recent race using the Riegel formula.
Open calculatorNFL Passer Rating Calculator
NFL passer rating calculator: QB rating from attempts, completions, yards, touchdowns, and interceptions.
Open calculatorPlank Test Calculator
Plank test calculator: core endurance rating from hold time.
Open calculatorPush Up Test Calculator
Push up test calculator: fitness rating by age and reps.
Open calculatorQuarterback Rating Calculator
Quarterback rating calculator: NFL passer rating from attempts, completions, yards, touchdowns, and interceptions.
Open calculatorShooting Percentage Calculator
Shooting percentage calculator: field-goal percentage from makes and attempts.
Open calculatorSit Up Test Calculator
Sit up test calculator: abdominal endurance rating.
Open calculatorSki Length Calculator
Ski length calculator: recommended ski length from height and style.
Open calculatorSoccer Speed Calculator
Soccer speed calculator: sprint speed from distance and time.
Open calculatorSwim Pace Calculator
Swim pace calculator: minutes per 100 meters from distance and time.
Open calculatorTrue Shooting Percentage Calculator
True shooting percentage calculator: TS% accounting for free throws.
Open calculatorVertical Jump Calculator
Vertical jump calculator: jump height from hang time (free-flight physics).
Open calculatorWin Loss Percentage Calculator
Win-loss percentage calculator: winning percentage with ties counted as half a win.
Open calculatorStatistics 28
Average Return Calculator
Average return calculator: simple average of yearly returns.
Open calculatorBayes Theorem Calculator
Bayes theorem calculator: posterior probability P(A|B) from prior and likelihood rates.
Open calculatorBinomial Probability Calculator
Binomial probability calculator: exact and cumulative probabilities for k successes in n trials.
Open calculatorChi-Square Goodness of Fit Calculator
Chi-square calculator: goodness-of-fit test statistic from observed vs expected counts.
Open calculatorCohen's D Calculator
Cohen's d calculator: effect size between two groups.
Open calculatorCombinations and Permutations Calculator
Combinations and permutations calculator: count arrangements and selections with or without repetition.
Open calculatorConditional Probability Calculator
Conditional probability calculator: P(A|B) from the intersection.
Open calculatorCorrelation Coefficient Calculator
Correlation coefficient calculator: Pearson r between two paired data sets, with strength and direction.
Open calculatorExpected Value Calculator
Expected value calculator: EV from two outcomes with probabilities and values.
Open calculatorFive Number Summary Calculator
Five number summary calculator: min, quartiles, median, max, IQR and outliers.
Open calculatorGeometric Distribution Calculator
Geometric distribution calculator: first success on trial k.
Open calculatorGeometric and Harmonic Mean Calculator
Geometric and harmonic mean calculator: multiplicative-average measures for rates, ratios, and growth data.
Open calculatorHarmonic Mean Calculator
Harmonic mean calculator: n divided by the sum of reciprocals.
Open calculatorIQR Calculator
IQR calculator: interquartile range from five values.
Open calculatorIndependent Events Calculator
Independent events calculator: probability both events happen.
Open calculatorLinear Regression Calculator
Linear regression calculator: slope, intercept, and R-squared for a least-squares line through paired data.
Open calculatorMargin of Error Calculator
Margin of error calculator: sampling error for a survey at a chosen confidence level.
Open calculatorMoving Average Calculator
Moving average calculator: simple moving average of a series.
Open calculatorNormal Distribution Probability Calculator
Normal distribution probability calculator: area under the curve for a value, above a value, or between two values.
Open calculatorOdds Ratio Calculator
Odds ratio calculator: association from a 2x2 table.
Open calculatorOutlier Calculator
Outlier calculator: flag outliers by the 1.5x IQR rule.
Open calculatorP Value Calculator
P value calculator: two-tailed p-value from a z-score.
Open calculatorPercentage Error Calculator
Percentage error calculator: measured vs true value as a percentage, for labs and measurements.
Open calculatorPermutation Combination Calculator
Permutation and combination calculator: nPr and nCr.
Open calculatorPoisson Probability Calculator
Poisson probability calculator: probability of exactly k events given a mean rate.
Open calculatorSkewness Calculator
Skewness calculator: asymmetry of a sample distribution.
Open calculatorT Test Calculator
T test calculator: two-sample t statistic and significance.
Open calculatorZ Test Calculator
Z test calculator: z-score for a sample mean vs a known population.
Open calculatorText & Developer Tools 15
Color Picker
Choose a color, inspect HEX, RGB, HSL, HSV, and CMYK values, and copy formats locally.
Open toolCountry Facts and Comparison
Browse country facts , capital, region, currency, languages, and flags , and compare two countries side by side.
Open toolEmail Preview Tester
Preview sender, subject line, and preheader truncation across representative inbox layouts. Runs privately in your browser.
Open toolFolder to Prompt
Turn a local project folder into a structured AI prompt without uploading its files.
Open toolJSON Formatter
Format, validate, and pretty-print JSON instantly in your browser. Fix errors with a clear message and line pointer.
Open toolKeyword Density Calculator
Keyword density calculator: keyword share of a text.
Open toolMeta Tag Generator
Generate meta tags and social preview strings.
Open toolMorse Code Converter
Morse code converter: text to Morse and back.
Open toolPassword Generator
Generate strong random passwords with configurable length and character sets, with entropy and strength rating. Local and private.
Open toolReadability Calculator
Score text readability and grade level.
Open toolSlug Generator
Turn any headline or phrase into a clean, URL-friendly slug instantly in your browser. SEO-ready output with a one-click copy.
Open toolSubnet Calculator
Calculate network address, broadcast, usable host range, subnet mask, and wildcard for any IPv4 address and CIDR prefix.
Open toolTyping Test
Measure words per minute, accuracy, errors, and progress with a local timed typing test.
Open toolUUID Generator
UUID generator: version 4 UUIDs for developers.
Open toolWord Counter
Count words, characters, sentences, and reading time.
Open toolTime & Work 41
Bandwidth Calculator
Bandwidth calculator: transfer time for a file size at a given connection speed.
Open calculatorBilling Rate Calculator
Billing rate calculator: hourly freelance rate from salary.
Open calculatorBonus Percentage Calculator
Bonus percentage calculator: bonus from salary and percent.
Open calculatorBusiness Days Calculator
Count weekdays between two dates with an optional number of excluded holidays.
Open calculatorCountdown Timer
Set a countdown and get notified when time is up.
Open timerDate Calculator Workspace
Compare dates or add and subtract calendar units with leap-day and month-end handling.
Open calculatorDate Difference Calculator
Calculate elapsed years, months, weeks, and days between two dates.
Open calculatorEmployee Turnover Calculator
Employee turnover rate calculator.
Open calculatorExpense Split Calculator
Expense split calculator: split a bill evenly.
Open calculatorHoliday Pay Calculator
Holiday pay calculator: time-and-a-half and double-time.
Open calculatorHours and Minutes Calculator
Add or subtract hours and minutes and show decimal-hour equivalents.
Open calculatorInvoice Fee Calculator
Invoice fee calculator: net after payment processing fees.
Open calculatorLate Fee Calculator
Late fee calculator: penalty on an overdue invoice.
Open calculatorMeeting Cost Calculator
Estimate direct meeting labor cost, cost per minute, participant-hours, and annual recurring cost from editable compensation assumptions.
Open calculatorMileage Log Calculator
Mileage log calculator: monthly and yearly mileage deductions.
Open calculatorMileage Reimbursement Calculator
Mileage reimbursement calculator: business miles at the IRS standard rate.
Open calculatorMonitor Height Calculator
Monitor height calculator: screen position from eye level.
Open calculatorOn Call Pay Calculator
On call pay calculator: compensation for on-call hours.
Open calculatorOvertime Calculator
Estimate regular and overtime pay with editable thresholds and overtime multipliers.
Open calculatorPTO Accrual Calculator
PTO accrual calculator: vacation hours per year from a pay-period rate.
Open calculatorPomodoro Timer
Focus with work and break intervals — set focus minutes, short and long breaks, and run the Pomodoro timer in your browser. Free, no signup.
Open timerPrintable Calendar
Create a clean six-week monthly calendar with Sunday or Monday week starts, then print it or save it as a PDF.
Open calculatorProject Quote Calculator
Project quote calculator: labor plus materials estimate.
Open calculatorRaise Percentage Calculator
Raise percentage calculator: new salary after a percent raise.
Open calculatorRetainer Calculator
Retainer calculator: monthly retainer from hourly rate.
Open calculatorRoyalty Calculator
Royalty calculator: earnings from sales at a royalty rate.
Open calculatorSalary to Hourly Converter
Convert annual salary to hourly, weekly, biweekly, and monthly equivalents.
Open calculatorSales Commission Calculator
Sales commission calculator: earnings from a sale at a commission rate plus any base.
Open calculatorSeverance Pay Calculator
Severance pay calculator: payout from weeks and salary.
Open calculatorShift Differential Calculator
Estimate base pay, shift premium, overtime, and total gross shift pay.
Open calculatorSprint Capacity Calculator
Sprint capacity calculator: team capacity in person-days and hours.
Open calculatorStanding Desk Calculator
Standing desk calculator: desk, chair, and monitor heights from your height.
Open calculatorStopwatch
Time events with lap tracking — start, stop, and record laps to hundredths of a second. Free, private, runs locally in your browser.
Open timerStory Points to Hours Calculator
Story points to hours calculator: agile estimation conversion.
Open calculatorTime Card Calculator
Calculate work hours, lunch deductions, overtime, and estimated gross pay.
Open calculatorTime Zone Meeting Planner
Compare a meeting time across common world time zones using browser time-zone data.
Open calculatorTime to Decimal Calculator
Convert hours and minutes to decimal hours for payroll and timesheets , and decimal hours back to hours and minutes.
Open calculatorTravel Reimbursement Calculator
Travel reimbursement calculator: mileage, meals and lodging claim.
Open calculatorVacation Accrual Calculator
Vacation accrual calculator: PTO hours per pay period and per year.
Open calculatorWords Per Minute Calculator
Words per minute calculator: typing speed from characters and time.
Open calculatorWorld Clock
Compare the current local date, time, UTC offset, and daylight-saving context across selected IANA time zones.
Open calculatorTravel 11
Clothing Size Converter
Clothing size converter: international clothing size conversion (US, UK, EU).
Open calculatorCommute Cost Calculator
Commute cost calculator: monthly driving cost and time for a round trip.
Open calculatorFlight Delay Compensation Calculator
Flight delay compensation calculator: EU261 compensation for delayed flights by distance.
Open calculatorHotel Stay Cost Calculator
Hotel stay cost calculator: total trip hotel cost including taxes and resort fees, with per-person split.
Open calculatorJet Lag Calculator
Jet lag calculator: expected recovery days from time-zone difference and direction of travel.
Open calculatorLuggage Volume Calculator
Luggage volume calculator: bag capacity in liters from dimensions.
Open calculatorPacking Weight Calculator
Packing weight calculator: total luggage weight from item counts and typical weights.
Open calculatorParking Cost Calculator
Parking cost calculator: daily vs monthly pass comparison for commuters.
Open calculatorRental Car Cost Calculator
Rental car cost calculator: full rental cost including insurance, gas, and daily rate.
Open calculatorToll Cost Calculator
Toll cost calculator: weekly and yearly toll spend from per-trip cost.
Open calculatorTravel Budget Calculator
Travel budget calculator: daily spending plus flights, hotels, and extras.
Open calculatorVehicles 23
Auto Insurance by State
Auto insurance by state: minimum liability limits, no-fault status and coverage tips for every state.
Open calculatorCar Insurance Estimator
Car insurance estimator: rough annual premium from vehicle value, driver age, and record.
Open calculatorCar Loan Refinance Calculator
Car loan refinance calculator: monthly savings from refinancing a car loan.
Open calculatorDiesel vs Gas Calculator
Diesel vs gas calculator: per-mile fuel cost comparison.
Open calculatorEV Charge Time Calculator
EV charge time calculator: hours to charge an EV battery.
Open calculatorEV Range Calculator
EV range calculator: electric car range from battery and consumption.
Open calculatorEV vs Gas Savings Calculator
EV vs gas savings calculator: annual fuel cost of an electric car versus a gas car.
Open calculatorEngine Horsepower Calculator
Engine horsepower calculator: estimate HP from weight and quarter-mile ET (trap method).
Open calculatorFuel Cost Per Mile Calculator
Fuel cost per mile calculator: cost per mile and per month from MPG and fuel price.
Open calculatorGas Budget Calculator
Gas budget calculator: monthly and yearly fuel spending.
Open calculatorHP to Weight Ratio Calculator
Horsepower-to-weight calculator: power-to-weight in hp/lb and hp/ton for any car.
Open calculatorHorsepower Calculator
Horsepower calculator: horsepower from torque and RPM (torque × RPM ÷ 5252).
Open calculatorIdle Cost Calculator
Idle cost calculator: fuel wasted while idling.
Open calculatorLease vs Buy Calculator
Lease vs buy calculator: compare total lease cost against loan ownership over the same term.
Open calculatorPayload and Towing Calculator
Payload and towing calculator: remaining payload from GVWR, curb weight, passengers, and cargo.
Open calculatorQuarter Mile Time Calculator
Quarter-mile time calculator: estimated ET and trap speed from horsepower and weight.
Open calculatorRoad Trip Cost Calculator
Road trip cost calculator: fuel, hotels, and food for a trip.
Open calculatorStopping Distance Calculator
Stopping distance calculator: reaction plus braking distance by speed.
Open calculatorTire Pressure Calculator
Tire pressure calculator: psi change with temperature.
Open calculatorTire Size Comparison Calculator
Tire size comparison calculator: diameter difference and speedometer error between two tire sizes.
Open calculatorTire Tread Depth Calculator
Tire tread depth calculator: remaining life from tread depth.
Open calculatorTowing Capacity Calculator
Towing capacity calculator: safe trailer weight from rated capacity minus payload and driver.
Open calculatorVehicle Depreciation Calculator
Vehicle depreciation calculator: projected value after years of ownership at a depreciation rate.
Open calculator