Math Calculators

From homework problems to data analysis at work, this collection of 42 free math calculators handles the arithmetic so you can focus on understanding the method. Each tool shows its work with step-by-step breakdowns, formulas, and clear explanations, and everything runs locally in your browser for instant, private answers with no signup. Many pages also include the underlying formula so you can learn the method, not just copy the answer.

The Scientific Calculator covers trigonometry, logarithms, exponents, and mathematical constants with a history tape, while the Fraction Calculator adds, subtracts, multiplies, and divides fractions with every simplification step shown. The Percentage Calculator answers the three classic questions — percentage of a number, what percent one value is of another, and percentage change or difference — in one place, and the Basic Calculator handles quick everyday arithmetic. Number theory helpers find greatest common factors, least common multiples, and prime factorizations with the work shown.

Statistics students get a full toolkit. The Standard Deviation Calculator computes population and sample deviation with variance and mean, the Statistics Calculator produces a complete descriptive summary with quartiles, IQR, and skewness, and the Z-Score Calculator converts raw scores into standard scores and percentiles. Geometry is covered too: solve any triangle from the sides and angles you know, find areas, volumes, surface areas, slopes, and distances, or apply the Pythagorean theorem to a right triangle.

Whether you are checking homework, preparing for an exam, converting scientific notation, factoring a large number, or double-checking a figure at work, there is a tool below for it — all free, all instant.