Mathematics

Mathematics: 11 free calculators & tools, including Percentage calculator and Percentage change. Explore formulas, examples and visual explanations.

Math & statistics

Find a percentage of a value, a part’s percentage, or the whole from a known part.

Compare signed percentage change and the symmetric percentage difference between values.

Add, subtract, multiply or divide fractions with exact reduced and mixed-number results.

Simplify ratios, solve a proportion or distribute a total across several shares.

Summarize a number list with average, median, modes, spread and optional weighted mean.

Convert signed integers between bases 2–36 without losing large integer precision.

Express a decimal in scientific or engineering notation with chosen significant figures.

Explore exact dice-sum outcome counts and chances of reaching a target.

Find the chance of a shared birthday and the group size needed to reach 50%.

Explore ideal thickness doubling and find how many folds reach a chosen distance.

Pick winners, shuffle a list or create balanced random teams, privately in your browser.