GOOD QUESTIONS. CLEAR CALCULATIONS.

A clearer path.
From question to number.

Percentages, fractions, statistics and equations. Work through everyday mathematics with 30 focused tools and formulas you can inspect.

30 focused calculatorsNo sign-upDefinitions, clearly explained

GENERAL MATHEMATICS

a little clarity.

30 FOCUSED TOOLSONE CLEAR RESULT ↗

English interface · Local calculations · No sign-up.

PERCENTAGESDisplay currency

Percentage of a number

Method & assumptions

YOUR GENERAL MATHEMATICS TOOLKIT

Find your next calculation.

30 calculators, together on one page.

Interactive calculators require JavaScript. Available tools:

Percentage of a number — Find a chosen percentage of an amount.

Percentage change — Measure relative change from an original value.

Percentage-point difference — Compare two percentages without confusing relative change.

Reverse percentage — Find the whole when you know a percentage part.

Fraction arithmetic — Add, subtract, multiply or divide two fractions.

Simplify a ratio — Reduce a two-part whole-number ratio.

Missing proportion — Solve a / b = c / x for a positive unknown.

Greatest common divisor — Find the largest positive integer dividing both inputs.

Least common multiple — Find the smallest positive common multiple.

Power calculator — Raise a real base to a real exponent where defined.

Nth root — Find a real nth root, including odd roots of negative numbers.

Factorial — Multiply all positive integers up to n.

Scientific notation — Express a value as a coefficient times a power of ten.

Decimal rounding — Round a number to a selected count of decimal places.

Arithmetic mean — Calculate the average of a number list.

Median — Find the middle value of a sorted dataset.

Mode — Find the most frequent value or tied values.

Population standard deviation — Measure spread across the complete entered population.

Sample standard deviation — Estimate spread using the n−1 sample divisor.

Dataset range — Find the smallest value, largest value and their difference.

Weighted mean — Average values with nonnegative weights.

Quadratic equation — Solve ax² + bx + c = 0 over the real numbers.

Linear equation — Solve ax + b = c.

Two-variable linear system — Solve two simultaneous linear equations.

Arithmetic sequence — Find the nth term and sum for a constant-difference sequence.

Geometric sequence — Find the nth term and sum for a constant-ratio sequence.

Permutations nPr — Count ordered selections without repetition.

Combinations nCr — Count unordered selections without repetition.

Prime number checker — Test a whole number for primality.

Number base converter — Convert integer notation between binary, octal, decimal and hexadecimal.

01 / FOCUSED

Thirty distinct tools.

Each calculator has its own inputs, definition and worked example.

02 / TRANSPARENT

Know the method.

See the formula and domain restrictions next to the result. Precision and assumptions are explained.

03 / LOCAL

Your inputs stay in your browser.

Calculations run locally. Advertising and hosting practices are described separately in the privacy page.