Everyday Calculators
Everyday Calculators Calculators
Fast general-purpose calculations for health, percentages, and everyday decisions.
144 tools
Health & Fitness 2
Flight Carbon Footprint Calculator
Flight carbon footprint calculator: estimate CO2 emissions for any flight by distance, cabin class and passengers. Free, editable inputs, runs in your browser.
Calories Burned Calculator
Calories burned calculator: estimate calories burned for over 100 activities using MET values, your body weight, and workout duration. Free, no signup.
Random & Fun 8
Random Team Splitter
Random team splitter: divide any list of names into balanced teams or groups in one click. Free, no signup, runs locally so your roster stays private.
Coin Flip Tool
Coin flip tool: flip a coin online with truly random results, flip history counts, and multiple coin tosses for quick decisions and games. Free, no signup.
Dice Roller
Dice roller: roll D6, D20, or any dice online with instant random results, per-die breakdown, and totals. Free, private, runs in your browser, no signup.
Markdown Table Generator
Markdown table generator: convert CSV, text, or pasted data into GFM pipe tables for GitHub docs and wikis instantly. Free, private, no signup required.
Prize Wheel Spinner
Spin the wheel to pick a random winner or prize from your own custom list. Free prize spinner for classrooms, raffles and streams, runs in your browser.
Random Name Picker
Random name picker: paste a list of names and pick one at random for giveaways, classroom draws, or team selection. Free, runs in your browser, no signup.
Random Number Generator
Random number generator: pick random integers or decimals in any range, with or without duplicates, for draws, games, sampling. Free, runs in your browser.
Username Scrambler
Username scrambler: turn your real name into random username ideas and memorable handles instantly. Free, runs locally in your browser, no signup required.
Conversions 2
Timezone Converter
Convert a time between cities and time zones worldwide with automatic daylight saving adjustment. Compare multiple zones at once, privately, no account.
Time Zone Converter
Time zone converter: compare times across world time zones and plan meetings that work for everyone. Free, no signup, runs locally in your web browser.
Time & Dates 14
Day of the Week Calculator
Day of the week calculator that finds the weekday for any date, past or future, including leap years, in seconds. Free, runs in your browser, no signup.
Percentage Change Calculator
Percentage change calculator: find percent increase or decrease between two values, with the exact formula shown. Free, private, runs in your browser, no signup.
Age Calculator
Age calculator: compute your exact age in years, months, and days from any birth date, plus days until your next birthday. Free, runs in your browser.
Days Between Dates Calculator
Days between dates calculator: count days, weeks, weekdays, and months between any two calendar dates instantly. Free, runs in your browser, no signup.
Due Date Calculator
Due date calculator: estimate your pregnancy due date from the first day of your last period or your conception date. Free, private, runs in your browser.
Gas Mileage Calculator
Gas mileage calculator: convert fuel gallons used and miles driven into MPG or L/100km instantly for any trip or fill-up. Free, runs locally, no signup.
Voltage Drop Calculator
Voltage drop calculator: find wire voltage drop and end of run voltage from length, current, wire gauge, and material, AC or DC. Free, private, runs locally.
Weighted Average Calculator
Weighted average calculator: apply the weighted mean formula to grades, scores, or values with custom weights, step by step. Free, no signup, runs locally.
Business Date Calculator
Business date calculator: add or subtract working days from any date, automatically skipping weekends and holidays. Free, no signup, runs locally in browser.
Date Calculator
Add or subtract days, weeks, months, or years to or from any date. Free date calculator with the formula shown - runs entirely in your browser, no signup.
Percentage Markup Calculator
Percentage markup calculator: get sell price from cost and markup percent, and see margin versus markup side by side. Editable rates, free, no signup.
Social Media Engagement Rate Calculator
Social media engagement rate calculator: work out Instagram and TikTok engagement rate from likes, comments, shares, and follower count. Free, no signup.
Week Number Calculator
Week number calculator: find the ISO week number for any date, plus its week start and end dates. Free, no signup, runs locally in your web browser now.
Weekday Calculator
Weekday calculator: instantly find what day of the week any past or future date falls on, no account required. Free, private, runs locally in browser.
Math 56
Absolute Value Calculator
Absolute value calculator: find |x| for any number or expression, with clear step-by-step working shown instantly. Free, private, runs in your browser.
Arc Length Calculator
Arc length calculator: compute a circle's arc length from radius and central angle in degrees or radians for geometry and engineering work. Free, no signup.
Area Perimeter Calculator
Area and perimeter calculator: rectangle, triangle, circle. Free area perimeter calculator with the formula shown - runs entirely in your browser, no signup.
Big Number Calculator
Big number calculator: exact arithmetic on numbers up to 10^30. Free big number calculator with the formula shown - runs entirely in your browser, no signup.
Circle Area Calculator
Circle area calculator: area and circumference from radius. Free circle area calculator with the formula shown - runs entirely in your browser, no signup.
Complex Number Calculator
Complex number calculator: add, subtract, multiply, and divide complex numbers in rectangular form with exact results. Free, runs in your browser, no signup.
Cone Volume Calculator
Cone volume calculator: find cone volume from radius and height in seconds, with slant height and base area shown. Free, runs in your browser, no signup.
Cross Product Calculator
Cross product calculator: vector product of two 3D vectors. Free cross product calculator with the formula shown - runs entirely in your browser, no signup.
Dot Product Calculator
Dot product calculator: scalar product of two 3D vectors. Free dot product calculator with the formula shown - runs entirely in your browser, no signup.
Ellipse Calculator
Ellipse calculator: compute area, perimeter, eccentricity, and foci from the semi-major and semi-minor axes for geometry and design work. Free, no signup.
Endpoint Calculator
Endpoint calculator: find a line segment's missing endpoint from one endpoint and the midpoint, with step-by-step coordinates for algebra. Free, no signup.
Exponential Growth Calculator
Exponential growth calculator: project any starting value forward from a growth rate and period, with doubling time shown. Free, private, in-browser, no signup.
Factorial Calculator
Factorial calculator: compute n! for any number with exact large-integer results for math, statistics, and probability. Free, private, runs in your browser.
Fibonacci Calculator
Fibonacci calculator: generate the nth Fibonacci number and the full sequence up to it with exact results instantly. Free, private, runs in your browser.
Fraction Operations Calculator
Fraction operations calculator: add, subtract, multiply, and divide fractions with simplified results and step-by-step working. Free, runs locally, no signup.
Golden Ratio Calculator
Golden ratio calculator: compute the golden ratio 1.618, golden rectangle dimensions, and section proportions from any input number. Free, runs in your browser.
Law of Cosines Calculator
Law of cosines calculator: solve any triangle side or angle from three known values, with working steps included. Free, private, runs in your browser.
Natural Log Calculator
Natural log calculator: compute ln(x) for any positive number with adjustable precision and large or small value support. Free, private, in-browser, no signup.
Nth Root Calculator
Nth root calculator: find any root of any number, including decimals and negative values where the root is defined. Free, private, in-browser, no signup.
Parallelogram Area Calculator
Parallelogram area calculator: area from base and height. Free parallelogram area calculator with the formula shown - runs entirely in your browser, no signup.
Percent Difference Calculator
Percent difference calculator compares two values to show relative difference with worked steps. Free, private, runs locally in your browser, no signup.
Prime Checker
Prime checker: test if any number is prime and show its full factor list instantly for math and coding work. Free, private, runs in your browser, no signup.
Proportion Solver
Proportion solver: find the missing value in any ratio equation a:b = c:x instantly, with cross-multiplication working shown. Free, private, in-browser.
Round Up Down Calculator
Round up/down calculator: nearest multiple in both directions. Free round up down calculator with the formula shown - runs entirely in your browser, no signup.
Semicircle Calculator
Semicircle calculator: get area, perimeter, arc length and diameter from radius or diameter in one step. Free, private, runs in your browser, no signup.
Slope Intercept Calculator
Slope intercept calculator: y = mx + b from two points. Free slope intercept calculator with the formula shown - runs entirely in your browser, no signup.
Sphere Volume Calculator
Sphere volume calculator: volume and surface area from radius. Free sphere volume calculator with the formula shown - runs entirely in your browser, no signup.
Trapezoid Area Calculator
Trapezoid area calculator: area from bases and height. Free trapezoid area calculator with the formula shown - runs entirely in your browser, no signup.
Trig Calculator
Trig calculator: solve sine, cosine, and tangent values in degrees or radians, with inverse and reciprocal functions. Free, runs locally in your browser.
Aspect Ratio Calculator
Aspect ratio calculator: get exact width and height dimensions for 16:9 video, images, and screens from any ratio. Free, private, runs in your browser.
Circle Calculator
Circle calculator: solve circumference, area, diameter, and radius from any one known value instantly. Free online tool, private, runs locally, no signup.
Concrete Cost Per Square Foot Calculator
Concrete cost per square foot calculator: price a concrete slab by dimensions, thickness, mix strength, and local rate. Free, editable rates, no signup.
Contrast Ratio Calculator (WCAG)
Contrast ratio calculator: test text and background colors against WCAG AA and AAA thresholds for accessible color contrast. Free, runs in your browser.
Exponent Calculator
Exponent calculator: compute any base raised to any power, including negative, zero, and fractional exponents, with fast precise results. Free, no signup.
Fractions Calculator
Fractions calculator: add, subtract, multiply, and divide fractions and mixed numbers with step-by-step simplified and decimal results. Free, no signup.
Fuel & Trip Cost Calculator
Fuel cost calculator: estimate gas money for any trip from distance, MPG, and fuel price, then split it between passengers. Free, editable rates, no signup.
GCF and LCM Calculator
GCF and LCM calculator: find the greatest common factor and least common multiple of two or more numbers instantly. Free, runs in your browser, no signup.
General and Scientific Calculator
General and scientific calculator: do everyday math plus trig, powers, logs, and functions in one clean keypad. Free, private, runs locally, no signup.
LLM Cost Checker
Check your real LLM API cost from the usage response: catches the 272K-token price cliff, near-zero cache hit rate, and batch/flex/fast mode multipliers. Astra, DeepSeek and GLM presets, or your own rate card. Private, in-browser.
Logarithm Calculator
Logarithm calculator: find the log of any number in any base, including natural log, with the formula shown. Runs entirely in your browser, no signup.
Mean Median Mode Calculator
Mean median mode calculator: compute mean, median, mode, and range for any set of numbers instantly and accurately. Free, private, runs in your browser.
Paint Cost Per Square Foot Calculator
Paint cost per square foot calculator: estimate paint price per sq ft and cost to paint a room from area, coats, and paint price. Free, runs in your browser.
Percentile Calculator
Percentile calculator: find percentile rank, the 90th percentile, or where a value falls in your data set, with the formula shown. Free, runs in browser.
Price Per Square Foot Calculator
Price per square foot calculator: divide a property price or build cost by area to compare cost per sq ft across homes or quotes. Free, private, no signup.
Pythagorean Theorem Calculator
Pythagorean theorem calculator: solve for any right triangle side from a, b, or c with the steps shown. Free, private, runs in your browser, no signup.
Rounding Numbers Calculator
Rounding calculator: round decimals to the nearest tenth, hundredth, ten, hundred, or any place value you choose instantly. Free, runs in your browser.
Septic Tank Size Calculator
Septic tank size calculator: estimate required tank gallons from bedroom count and daily usage assumptions for code-compliant sizing. Free, no signup.
Simplify Fractions Calculator
Simplify fractions calculator: reduce any fraction to lowest terms and convert between improper fractions and mixed numbers with steps shown. Free, no signup.
Standard Error Calculator
Standard error calculator: compute the standard error of the mean (SEM) using the standard error formula from your sample. Free, private, runs locally, no signup.
Surface Area Calculator
Surface area calculator for cubes, spheres, cylinders, cones, and more. Shows the formula for each shape and runs entirely in your browser with no signup.
Volume Calculator
Volume calculator: compute volume for boxes, cylinders, spheres, cones, and more shapes with formulas shown. Free, runs locally in your browser, no signup.
Daily Hydration Calculator
Daily hydration calculator: find how much water you should drink a day based on your body weight and activity level. Free, runs in your browser, no signup.
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
Standard deviation calculator: compute sample and population SD, variance, mean, and margin of error from any data set. Free, runs in your browser, no signup.
Time Duration Calculator
Time duration calculator: find the exact time elapsed between two dates and times in days, hours, and minutes. Free, no signup, runs locally in your browser.
Triangle Calculator
Triangle calculator: solve sides, angles, and area from any three known values, including right triangles and Heron's formula. Free, runs in your browser.
More everyday tools 62
Heron's Formula Calculator
Heron's formula calculator: triangle area from three sides. Free heron's formula calculator with the formula shown - runs entirely in your browser, no signup.
Hexagon Calculator
Hexagon calculator: area and perimeter of a regular hexagon. Free hexagon calculator with the formula shown - runs entirely in your browser, no signup.
Jet Lag Adjustment Calculator
Jet lag adjustment calculator: build a day-by-day sleep and light schedule for your trip so you adapt faster. Free, private, runs in your browser, no signup.
Line Intersection Calculator
Line intersection calculator: where two lines cross. Free line intersection calculator with the formula shown - runs entirely in your browser, no signup.
Linear Equation Solver
Linear equation solver that solves systems of equations step by step with substitution, elimination, or Cramer's rule. Free, no signup, in your browser.
Linear Interpolation Calculator
Linear interpolation calculator: compute intermediate values between two data points plus the slope and line equation. Free, private, in your browser.
Matrix Determinant Calculator
Matrix determinant calculator: compute the determinant of 2x2, 3x3, and up to 6x6 matrices with steps shown. Free, private, runs locally in your browser.
Matrix Transpose Calculator
Matrix transpose calculator: transpose any matrix up to 10x10 instantly, rows flipped to columns, for linear algebra and data work. Free, runs locally.
Modulo Calculator
Modulo calculator: compute a mod b with quotient and remainder for programming, hashing, ciphers, and clock math. Free, private, runs in your browser.
Polynomial Evaluator
Polynomial evaluator: substitute any value into a polynomial and get the exact result, with each substitution step shown. Free, private, runs in your browser.
Remainder Calculator
Remainder calculator: quotient and remainder of a division. Free remainder calculator with the formula shown - runs entirely in your browser, no signup.
Road Trip Time Calculator
Road trip time calculator: estimate driving time, breaks, fuel stops and arrival time for any route and speed. Free, no signup, runs entirely in your browser.
Series Sum Calculator
Series sum calculator: total arithmetic and geometric series fast, with partial sums and term counts shown. Free, private, runs in your browser, no signup.
Sunrise Sunset Calculator
Sunrise sunset calculator: get local sunrise, sunset, golden hour, and day length for any date and location worldwide. Free, runs in your browser, no signup.
AI Citation Checker
Free AI citation checker: paste a URL and get a 0-100 citation-readiness score from 28 checks — sourced numbers, entity clarity, freshness, structured data, and AI-slop tells. See exactly what answer engines look for before they cite you.
Amortization Calculator
Amortization calculator: build a full mortgage or loan amortization schedule and see how extra payments cut interest. Free, editable rates, no signup.
Annuity Calculator
Annuity calculator: compute annuity payments, future value, or present value from rate, term, and payment frequency. Free, editable rates, no signup needed.
BTU Calculator
BTU calculator: size heating and cooling by room dimensions, insulation, and climate to get the right BTU output. Free, runs locally, no signup required.
Bond Calculator
Bond calculator: compute bond price, yield to maturity, and coupon payments from face value, rate, and term. Free, editable inputs, runs in your browser.
CD Calculator
CD calculator: compute certificate of deposit interest and maturity value from deposit, rate, and term with compounding. Free, private, runs in your browser.
Coefficient of Variation Calculator
Coefficient of variation calculator: turn standard deviation and mean into CV, the relative standard deviation for comparing data spread. Free, no signup.
Combinations Calculator (nCr)
Combinations calculator (nCr): find how many ways you can choose r items from n, with the combination formula explained step by step. Free, no signup.
Confidence Interval Calculator
Confidence interval calculator: build a confidence interval for a mean from sample size, mean, and standard deviation. Free, private, runs in your browser.
Depreciation Calculator
Depreciation calculator: compute straight line, declining balance, and sum of years digits depreciation schedules by asset. Free, runs in your browser.
HELOC Calculator
HELOC calculator: estimate your home equity line of credit limit, monthly interest-only and repay payments, and total cost. Free, editable rates, no signup.
HEX to RGB Converter
HEX to RGB converter: convert any hex color code into RGB values instantly for CSS, design, and styling work. Free, private, runs in your browser, no signup.
Heat Index Calculator
Heat index calculator: convert air temperature and humidity into the feels-like heat index and outdoor risk level. Free, private, runs in your browser.
IRR Calculator
Calculate the internal rate of return from a series of cash flows. Free irr calculator with the formula shown - runs entirely in your browser, no signup.
Investment Return Calculator
Investment return calculator: project final value and growth from contributions, rate of return, compounding, and time horizon. Free, editable rates, no signup.
Matrix Calculator
Matrix calculator: compute determinant, inverse, transpose, rank, and products for 2x2 to 4x4 matrices with clear instant results. Free, private, no signup.
Net Worth Calculator
Add up your assets and liabilities to find your net worth. Free net worth calculator with the formula shown - runs entirely in your browser, no signup.
Numbers to Words Converter
Numbers to words converter: write any number or check amount in words, with currency support for checks and legal documents. Free, no signup, runs locally.
Ohm's Law Calculator
Calculate voltage, current, resistance, or power using Ohm's law. Free ohms law calculator with the formula shown - runs entirely in your browser, no signup.
One Rep Max Calculator
One rep max calculator: estimate your 1RM from weight lifted and reps using Epley, Brzycki, and Lombardi formulas with training charts. Free, no signup.
Ovulation Calculator
Ovulation calculator: predict your fertile window and next ovulation date from cycle length and last period. Free, private, runs in your browser, no signup.
PayPal Fee Calculator
PayPal fee calculator: estimate goods and services fees, net proceeds, and reverse gross-up amounts at 3.49 percent plus 0.49 per deal. Editable rates, free.
Pension Calculator
Pension calculator: project retirement income from annual contributions, employer match, expected growth rate, and years to retirement. Free, no signup.
Permutations Calculator (nPr)
Permutations calculator: compute nPr arrangements of n objects taken r at a time, with the formula shown for checking. Free, runs in your browser, no signup.
Present Value Calculator
Present value calculator: discount a future sum or stream of payments to today's value using your own interest rate. Free, private, editable rates, no signup.
Quadratic Formula Calculator
Quadratic formula calculator: solve ax^2+bx+c=0 for real and complex roots plus discriminant and vertex, with worked steps. Free, runs locally, no signup.
Quartile Calculator
Quartile calculator: find Q1, Q2, Q3 and the interquartile range for any data set with the quartiles formula shown. Free, private, runs in your browser.
RMD Calculator
RMD calculator: compute required minimum distributions from account balances using IRS life expectancy factors. Editable, free, runs locally, no signup.
Roth IRA Calculator
Roth IRA calculator: project tax-free retirement savings from your contributions, expected growth rate, and years to retirement. Free, editable rates.
Sample Size Calculator
Sample size calculator: determine how many survey respondents you need for a target confidence level and margin of error. Free, no signup, runs in your browser.
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
Sonotube concrete calculator: estimate concrete for a round column in cubic feet, cubic yards, and 60 or 80 lb bags. Free, runs in your browser, no signup.
Statistics Calculator
Statistics calculator: get mean, median, mode, range, standard deviation, variance, and geometric mean with sample or population mode. Free, no signup.
Stripe Fee Calculator
Stripe fee calculator: estimate 2.9% + $0.30 processing fees, reverse fees to gross up invoices, and see net proceeds. Free, editable rates, runs in your browser.
Sun & Moon Planner
Sun and moon planner: find sunrise, sunset, moonrise, moonset, and moon phase for any date and location to plan photography or stargazing. Free, runs locally.
Tip & Bill Split Calculator
Tip calculator and bill split calculator: add a restaurant tip and divide the total evenly or unevenly across any group. Free, private, runs in your browser.
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
Variance calculator: compute sample or population variance, standard deviation, and sum of squared deviations from any data set. Free, private, no signup.
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
BPM to delay time calculator: convert your track tempo into ms per beat, quarter, eighth, and dotted eighth delay times for music production. Free, no signup.
Citation Formatter
Citation formatter: generate APA and MLA citations and bibliographies from your source details in seconds. Free, private, runs in your browser, no signup.
Currency Converter
Currency converter: calculate live foreign exchange rates for USD to EUR and more before you trade, shop, or travel abroad. Free, no signup, runs in your browser.
Data Transfer Rate Calculator
Data transfer rate calculator: convert Mbps to GB and estimate download or upload time for any file size at any connection speed. Free, private, no signup.
Doomsday Calculator
Doomsday calculator: use the famous Doomsday algorithm to find the exact weekday of any date in history. Free, no signup, runs locally in your browser.
EMI Calculator
EMI calculator: compute your loan monthly installment from principal, interest rate, and tenure, with total interest and payment breakdown. Free, runs in browser.
Regex Tester
Regex tester: test regular expressions against sample text and see live matches, capture groups, and errors to debug patterns fast. Free, private, no signup.
Social Media Value Calculator
Social media value calculator: estimate what your views are worth per post, month, and year using your own editable CPM. Free, private, no signup.
Weather Lookup
Current weather and 10-day forecast for any city worldwide. Temperature, feels-like, precipitation, wind, and UV from Open-Meteo. Private, no account.