Math Calculators

Free, instant math calculators for percentages, fractions, averages, ratios, area, age, dates, and everyday calculations. No sign-up required.

Percentage Calculator

Find any percentage of a number, work out what percentage X is of Y, or calculate percentage change.

Add, subtract, multiply, or divide any two fractions. Results simplified and shown as decimals.

Calculate mean, median, mode, and range from a list of numbers.

Simplify any ratio to its lowest terms and scale it to new values.

Calculate the area of rectangles, circles, and triangles in sq ft and m².

Find your exact age in years, months, and days — plus total days lived and next birthday.

Calculate the number of days, weeks, and business days between two dates.

Generate truly random numbers in any range, with optional no-duplicate mode.

Calculate how much to tip and split a restaurant bill between any number of people.

Find out how much any appliance costs to run per day, week, month, or year.

Calculate journey fuel cost from distance, MPG or L/100km, and fuel price.