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.

Add or subtract hours and minutes, convert between time units, or find the difference between two times.

Enter course grades and credit hours to calculate your cumulative GPA on the 4.0 scale.

Find out what score you need on your final exam to achieve your desired course grade.

Calculate monthly payments, total interest, and total cost for any fixed-rate loan.

Convert between Roman numerals and decimal numbers (1–3,999). Instant bidirectional conversion.

Convert numbers to and from scientific notation. Perform arithmetic in scientific notation.

Count significant figures in any number and round to a specified number of sig figs.