Math & Numbers tools

Math tools that handle the everyday calculations, percentages and ratios, general arithmetic, and number-format conversions. Each shows its working and runs instantly in your browser, with nothing to install.

Popular Math & Numbers tools

Percentage Calculator
Work out percentages four ways: a percent of a value, what percent one number is of another, the percent change between two numbers, and a percentage increase or decrease. Calculates in your browser.
Scientific Calculator
A calculator that understands full expressions, operators, powers, parentheses, factorials, the constants π and e, and trig, log, and root functions in radians or degrees. Calculates in your browser.
Ratio Calculator
Simplify a ratio to its lowest whole-number terms, or solve a proportion to find a missing value when two ratios are equal. Handles decimal terms too. Calculates in your browser.
Fraction Calculator
Add, subtract, multiply, and divide two fractions. The answer is reduced to lowest terms and shown as a mixed number and a decimal. Calculates in your browser.
Average Calculator
Paste a list of numbers to get the mean, median, mode, range, count, sum, and standard deviation at once. Calculates in your browser.
Area Calculator
Find the area of a rectangle, triangle, circle, parallelogram, trapezoid, or ellipse from its dimensions. Calculates in your browser.

Percentages & Ratios

General Math

Number Formats