Calculators
Fast, accurate calculators for everyday math.
Age Calculator
Calculate exact age in years, months and days from any date of birth — plus total months, weeks and days. Free and instant.
Percentage Calculator
Calculate percentages three ways: X% of a number, what % one number is of another, and percentage increase or decrease. Free and instant.
BMI Calculator
Calculate your Body Mass Index (BMI) in metric or imperial units and see your weight category instantly. Free and private.
Loan / EMI Calculator
Calculate your monthly loan EMI, total interest and total payment from the loan amount, interest rate and tenure. Free and instant.
Date Difference Calculator
Calculate the exact difference between two dates in years, months, days and total days, weeks and hours. Free and instant.
Tip Calculator
Calculate the tip and total bill, and split it between any number of people. Free, instant tip calculator with custom percentages.
Discount Calculator
Calculate the sale price and how much you save from an original price and a discount percentage. Free and instant.
GPA Calculator
Calculate your GPA from course grades and credit hours on a 4.0 scale. Free, instant, in-browser GPA calculator.
Compound Interest Calculator
Calculate compound interest and final balance from principal, rate, time and compounding frequency. Free, instant compound interest calculator.
Average / Mean Calculator
Calculate the mean, median, sum, count, min and max of a list of numbers. Free, instant average calculator — paste any numbers.
GST / Sales Tax Calculator
Add or remove GST / sales tax from a price at any rate, and see the net, tax and gross amounts. Free, instant calculator.
Time Duration Calculator
Calculate the duration between two times in hours and minutes. Free, instant, in-browser time difference calculator.
Temperature Converter
Convert temperatures between Celsius, Fahrenheit and Kelvin instantly. Free, in-browser temperature converter.
Aspect Ratio Calculator
Calculate a missing width or height that keeps your aspect ratio (16:9, 4:3, etc.). Free, instant aspect ratio calculator.
Calorie / TDEE Calculator
Estimate your daily calorie needs (BMR and TDEE) from age, sex, height, weight and activity level. Free, instant.
Unit Converter
Convert between units of length, weight, temperature, volume, area and speed. Free, instant, in-browser unit converter.
Date Calculator (Add / Subtract Days)
Add or subtract days, weeks, months or years from a date to find the resulting date. Free, instant date calculator.
Markup & Margin Calculator
Calculate selling price, profit, markup % and margin % from cost and price. Free, instant business calculator.
Salary to Hourly Converter
Convert an annual salary to hourly, daily, weekly and monthly pay (and back). Free, instant pay converter.
Dice Roller & Random Picker
Roll virtual dice or pick a random item from a list, using the secure crypto API. Free, instant, in-browser.
Stopwatch & Timer
A free online stopwatch with laps and a countdown timer with an alarm. Runs in your browser, no sign-up.
About these calculators
Every tool here runs entirely in your browser — your files and text never leave your device, there's no sign-up, and there are no usage limits. Pick a tool above to get started, or browse the full A–Z index.