Math Calculators

From quick percentage checks to step-by-step statistics, our free math calculators give you answers in seconds — with the formulas shown, not hidden. Each tool is built for students, teachers, and anyone who needs reliable arithmetic without opening a spreadsheet. Type your numbers, see the result instantly, and scroll down for plain-English explanations, worked examples, and answers to the questions people ask most.

Percentage Calculator

Find any percentage in seconds — what X% of a number is, percent change between two values, and more.

Average Calculator

Mean, median and mode side by side — plus weighted averages, sorted data, and a quick visual chart.

Fraction Calculator

Add, subtract, multiply, divide and simplify fractions — with every step shown, plus mixed numbers and decimals.

Ratio Calculator

Simplify ratios, solve proportions, and scale recipes or plans to any size — ratio, decimal and percent together.

Scientific Calculator

A full scientific calculator in your browser — trig, logs, exponents, fractions and equation solving, with keyboard-first input.

Standard Deviation Calculator

Find standard deviation and variance for any dataset — population or sample — with every step shown.