Math Calculators

Find a percentage of a number, a part-to-whole percentage or a percentage change.

Add, subtract, multiply or divide two fractions and reduce the answer.

Evaluate an expression with powers, roots, logarithms, trigonometry and factorials.

Find the arithmetic mean, median, sum and range of a list of numbers.

Measure the spread of a list using either the sample or population convention.

Generate whole numbers in an inclusive range, with optional duplicate prevention.

Reduce a pair of whole numbers to its simplest ratio and show each share.

Find the hypotenuse, area, perimeter and acute angles from two perpendicular legs.

Find rectangle, triangle or trapezoid area using consistent length units.

Calculate the volume of a box, cylinder, sphere or cone.

Find a circle’s area, circumference and diameter from its radius.

Solve ax² + bx + c = 0, including repeated, complex and linear cases.

Raise a base to a power with clear handling of zero and negative bases.

Find the exponent needed to produce a positive argument in a chosen base.

Calculate principal real roots, including odd roots of negative numbers.

Find the largest positive whole number dividing every entered integer.

Find an exact common multiple of a list of integers.

Compare a measured value with a non-zero reference using absolute percent error.

Combine two independent event probabilities for both, either, neither or exactly one.

Count selections of distinct items with or without order.

Fit a least-squares line to paired measurements and evaluate it at an entered x.

Smooth an ordered series and inspect each complete trailing window.

Combine independent standard uncertainty contributions already expressed in result units.

Find project duration, early and late task times, and zero-slack tasks in a dependency graph.