Everyday Calculators
Everyday Calculators Calculators
Fast general-purpose calculations for health, percentages, and everyday decisions.
134 tools
Health & Fitness 2
Random & Fun 8
Random Team Splitter
Split any list of names into balanced random teams instantly. Choose team count or members per team — runs entirely in your browser.
Coin Flip Tool
Flip one or up to 100 coins locally with secure browser randomness, counts, percentages, streaks, and sequence.
Dice Roller
Roll 1–10 selectable D4, D6, D8, D10, D12, or D20 dice using unbiased local browser randomness.
Markdown 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.
Prize Wheel Spinner
Spin a prize wheel to randomly choose a winner from segments you add. Local browser randomness, no upload.
Random Name Picker
Draw one name from a list of names you enter, using unbiased local browser randomness. Add names one per line, then pick.
Random Number Generator
Generate one or up to 100 random integers from a custom range using unbiased local browser randomness.
Username Scrambler
Generate randomized but memorable username ideas from your real name or email prefix, entirely in your browser.
Conversions 1
Time & Dates 10
Day of the Week Calculator
Day of the week calculator: what weekday was any date, plus week number and day of year.
Percentage Change Calculator
Percentage change calculator: the % increase or decrease between two values.
Age Calculator
Calculate exact calendar age, total elapsed days, and time until the next birthday.
Days Between Dates Calculator
Find the number of days, weeks, and weekdays between two dates.
Due Date Calculator
Estimate your pregnancy due date from your last period or conception date.
Gas Mileage Calculator
Calculate miles per gallon or liters per 100 km from distance and fuel used.
Voltage Drop Calculator
Estimate voltage drop in a wire run based on length, current, and wire gauge.
Weighted Average Calculator
Calculate a weighted average (weighted mean). Enter values and weights to combine scores or grades that count differently.
Percentage 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.
Social Media Engagement Rate Calculator
Calculate engagement rate from likes, comments, shares, and reach or followers, and compare against typical benchmarks.
Math 54
Absolute Value Calculator
Absolute value calculator: distance from zero.
Arc Length Calculator
Arc length calculator: distance along a circle arc.
Area Perimeter Calculator
Area and perimeter calculator: rectangle, triangle, circle.
Big Number Calculator
Big number calculator: exact arithmetic on numbers up to 10^30.
Circle Area Calculator
Circle area calculator: area and circumference from radius.
Complex Number Calculator
Complex number calculator: add, subtract, multiply complex numbers.
Cone Volume Calculator
Cone volume calculator: volume from radius and height.
Cross Product Calculator
Cross product calculator: vector product of two 3D vectors.
Dot Product Calculator
Dot product calculator: scalar product of two 3D vectors.
Ellipse Calculator
Ellipse calculator: area and approximate circumference.
Endpoint Calculator
Endpoint calculator: missing endpoint from midpoint and one endpoint.
Exponential Growth Calculator
Exponential growth calculator: value after continuous growth.
Factorial Calculator
Factorial calculator: n! for any integer up to 170.
Fibonacci Calculator
Fibonacci calculator: nth Fibonacci number.
Fraction Operations Calculator
Fraction operations calculator: add, subtract, multiply, divide fractions.
Golden Ratio Calculator
Golden ratio calculator: phi times a number.
Law of Cosines Calculator
Law of cosines calculator: third side from two sides and angle.
Natural Log Calculator
Natural log calculator: ln(x) and e^x.
Nth Root Calculator
Nth root calculator: the n-th root of a number.
Parallelogram Area Calculator
Parallelogram area calculator: area from base and height.
Percent Difference Calculator
Percent difference calculator: relative difference between two values.
Prime Checker
Prime checker: is a number prime, with factors.
Proportion Solver
Proportion solver: solve a/b = c/d for the unknown.
Round Up Down Calculator
Round up/down calculator: nearest multiple in both directions.
Semicircle Calculator
Semicircle calculator: area and arc length.
Slope Intercept Calculator
Slope intercept calculator: y = mx + b from two points.
Sphere Volume Calculator
Sphere volume calculator: volume and surface area from radius.
Trapezoid Area Calculator
Trapezoid area calculator: area from bases and height.
Trig Calculator
Trig calculator: sine, cosine, tangent of an angle.
Aspect Ratio Calculator
Calculate the aspect ratio from width and height, or the missing dimension to hit a target ratio like 16:9.
Circle Calculator
Find a circle's area, circumference, diameter, or radius from any one value.
Concrete Cost Per Square Foot Calculator
Estimate concrete cost per square foot and total for a slab from your own rate and waste.
Contrast Ratio Calculator (WCAG)
Check the contrast ratio between two colors and see whether it passes WCAG AA and AAA for normal and large text.
Exponent Calculator
Calculate a base raised to an exponent, including negative and fractional exponents.
Fractions Calculator
Add, subtract, multiply, or divide two fractions and get the simplified result.
Fuel & Trip Cost Calculator
Estimate fuel used, total trip cost, and each traveler’s share in MPG or L/100 km mode.
GCF and LCM Calculator
Find the greatest common factor and least common multiple of two numbers.
General and Scientific Calculator
Use a fast general calculator or switch on scientific functions for trigonometry, logarithms, powers, roots, memory, and calculation history.
Logarithm Calculator
Calculate the logarithm of a number in any base, or natural log.
Mean Median Mode Calculator
Calculate mean, median, mode, range, sum, and count for any list of numbers.
Paint Cost Per Square Foot Calculator
Estimate paint cost per square foot or the total to paint a room from your own rate.
Percentile 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.
Price Per Square Foot Calculator
Work out price per square foot, or back into total price or area from a rate and budget.
Pythagorean Theorem Calculator
Find the missing side of a right triangle using a² + b² = c².
Rounding Numbers Calculator
Round any number to the nearest ten, one, tenth, hundredth, or thousandth , with every place shown at once.
Septic Tank Size Calculator
Estimate a septic tank size in gallons from the number of bedrooms and daily usage assumptions.
Simplify Fractions Calculator
Reduce any fraction to lowest terms with the GCD shown, plus decimal and mixed-number forms.
Standard Error Calculator
Calculate the standard error of the mean (SEM). Enter sample standard deviation and size to measure how precise the sample mean is.
Surface Area Calculator
Calculate the surface area of common 3D shapes.
Volume Calculator
Calculate the volume of common 3D shapes.
Daily Hydration Calculator
Estimate your daily water intake from body weight, activity minutes, and climate temperature.
Order of Operations Calculator (PEMDAS)
Evaluate math expressions with the correct order of operations (PEMDAS): parentheses, exponents, multiplication and division, then addition and subtraction.
Standard Deviation Calculator
Calculate the sample or population standard deviation, variance, mean, and margin of error for any set of numbers.
Triangle Calculator
Solve any triangle from its three sides: area, angles, height, inradius, circumradius, and perimeter.
More everyday tools 59
Heron's Formula Calculator
Heron's formula calculator: triangle area from three sides.
Hexagon Calculator
Hexagon calculator: area and perimeter of a regular hexagon.
Jet Lag Adjustment Calculator
Jet lag adjustment calculator: estimated days to adjust after crossing time zones.
Line Intersection Calculator
Line intersection calculator: where two lines cross.
Linear Equation Solver
Linear equation solver: ax + b = c.
Linear Interpolation Calculator
Linear interpolation calculator: estimate y between two points.
Matrix Determinant Calculator
3x3 matrix determinant calculator.
Matrix Transpose Calculator
Matrix transpose calculator: flip a 2x3 matrix.
Modulo Calculator
Modulo calculator: remainder of a divided by b.
Polynomial Evaluator
Polynomial evaluator: evaluate ax² + bx + c at x.
Remainder Calculator
Remainder calculator: quotient and remainder of a division.
Road Trip Time Calculator
Road trip time calculator: drive time and arrival from distance, speed, and stops.
Series Sum Calculator
Arithmetic series sum calculator: a1 + (a1+d) + ...
Sunrise Sunset Calculator
Sunrise sunset calculator: sunrise, sunset, and daylight hours for any city today plus the next week.
Amortization Calculator
Calculate your monthly loan payment and full amortization schedule, and see how extra monthly payments shorten the term and reduce total interest.
Annuity Calculator
Estimate the future value or payout of an annuity based on deposit, rate, and term.
BTU Calculator
Estimate the BTUs needed to heat or cool a room based on size and conditions.
Bond Calculator
Estimate a bond's current yield and price from coupon rate, face value, and market rate.
CD Calculator
Calculate the maturity value and interest earned on a Certificate of Deposit over its term.
Coefficient of Variation Calculator
Calculate the coefficient of variation (relative standard deviation). Enter the mean and standard deviation to compare variability across data sets.
Combinations Calculator (nCr)
Calculate the number of combinations (nCr) of choosing r items from n, with the formula explained.
Confidence Interval Calculator
Compute a confidence interval for a sample mean given size, std dev, and confidence level.
Depreciation Calculator
Estimate straight-line or declining-balance depreciation over an asset's life.
HELOC Calculator
Estimate the monthly payment and total cost of a home equity line of credit.
HEX to RGB Converter
Convert any hex color code to its red, green, and blue (RGB) values instantly, in the browser.
Heat Index Calculator
Calculate the apparent (feels-like) temperature from air temperature and humidity.
IRR Calculator
Calculate the internal rate of return from a series of cash flows.
Investment Return Calculator
Calculate total return and annualized (CAGR) return on an investment.
Matrix Calculator
Add, subtract, or multiply 2x2 and 3x3 matrices.
Net Worth Calculator
Add up your assets and liabilities to find your net worth.
Numbers to Words Converter
Convert any whole number into English words , for checks, contracts, and homework.
Ohm's Law Calculator
Calculate voltage, current, resistance, or power using Ohm's law.
One Rep Max Calculator
Estimate your one-rep max from a submaximal lift.
Ovulation Calculator
Estimate your fertile window and ovulation date based on cycle length and last period.
PayPal 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.
Pension Calculator
Estimate a monthly pension benefit from salary, years of service, and a multiplier.
Permutations Calculator (nPr)
Calculate the number of permutations (nPr) of arranging r items from n, with the formula explained.
Present Value Calculator
Find what a future lump sum is worth today at a given discount rate.
Quadratic Formula Calculator
Solve a quadratic equation ax² + bx + c = 0 and see the roots.
Quartile Calculator
Calculate the first (Q1), second (median/Q2), and third (Q3) quartiles plus the interquartile range (IQR) of a data set.
RMD Calculator
Estimate the Required Minimum Distribution from a retirement account at age 73+.
Roth IRA Calculator
Estimate the future value of a Roth IRA with annual contributions and tax-free growth.
Sample Size Calculator
Determine the sample size needed for a survey or study at a given confidence and margin.
Simple Interest Calculator
Calculate simple interest and total amount with interest using principal, annual rate, and time. Simple interest applies only to the original principal.
Sonotube Concrete Calculator
Estimate concrete for a round sonotube column in cubic feet, cubic yards, and 60/80 lb bags.
Statistics Calculator
Compute descriptive statistics for a sample or population: mean, median, mode, range, sum, count, standard deviation, variance, and geometric mean.
Stripe 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.
Sun & Moon Planner
Estimate sunrise, sunset, twilight, daylight, moon phase, moonrise, and moonset for a date and coordinates.
Tip & Bill Split Calculator
Calculate a tip, split a bill evenly, and make rounding choices explicit.
US Weather Forecast
Official National Weather Service forecast for US latitude and longitude coordinates. Enter exact coords for the authoritative federal NWS forecast, hourly a.
Variance Calculator
Calculate sample or population variance from a data set. Enter values to see variance, standard deviation, and the sum of squared deviations.
Z-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.
BPM to Delay Time Calculator
Convert BPM (beats per minute) into delay and reverb timing in milliseconds for quarter, eighth, and dotted eighth notes.
Citation Formatter
Format a book, website, or article into APA and MLA citations from author, title, publisher, year, and URL.
Currency Converter
Free currency converter between 15+ major currencies — USD, EUR, GBP, JPY and more. Quick estimates with reference rates, no signup.
Data Transfer Rate Calculator
Estimate how long a file takes to transfer at a given speed, or the effective rate given size and time.
EMI Calculator
Calculate the equated monthly installment (EMI) for a fixed-rate loan, plus total interest and an amortization schedule.
Regex Tester
Test a regular expression pattern against a string, see highlighted matches and a live match count, all in your browser.
Weather Lookup
Current weather and 7-day forecast for any city worldwide. Temperature, feels-like, precipitation, wind, and UV from Open-Meteo. Private, no account.