Math calculators

Radius, diameter, circumference, and area, from any one of those quantities.

From the base and the height, from three sides, or from two sides and the included angle.

Area, perimeter, and diagonal from two sides.

The midsegment times the height. The perimeter, when the non-parallel sides are known.

Finds the third side of a right triangle.

The discriminant and the roots of ax² + bx + c = 0.

Volume and surface area from the radius.

Volume, side area, and full surface of a pipe, a can, or a tank.

Volume, slant height, and surface area of a right circular cone.

Volume, surface area, and the space diagonal.

Finds x in the proportion a / b = c / x.

The greatest common divisor and the least common multiple of two integers.

The ordinary mean and the weighted mean of a list of numbers.

A root of a chosen degree, checked by raising it back.

The base to any integer or fractional power.

The product of all integers from 1 to n.

How many ways to choose k items from n.

A primality check and a factorization.

How many integers from 1 to n are coprime to n.

The digits added again until one digit remains.

Whether the sum of the digits, each to the power of the digit count, equals the number.

Converts an integer between bases from 2 to 36.

Converts between Roman notation and an ordinary number.

An integer quotient and a nonnegative remainder.

Addition, subtraction, multiplication, and division of common fractions.

An improper fraction as a whole number and a remainder.

Area and perimeter of a regular hexagon.

Volume of a cone with two radii.

Volume of a pyramid with two square bases.

Three angles from three sides.

A summary of a number list: mean, median, mode, and range.

How many standard deviations the value lies from the mean.

The value below which a given share of the series lies.

Bounds on the mean from the spread and the sample size.

How many answers you need for a set error on a share.

A linear link between two series, by Pearson.

The remainder of a power divided by a modulus.

A number whose product with this one leaves a remainder of 1.

A term and the sum of an arithmetic or a geometric progression.

Common, natural, binary, or a logarithm in a base you choose.

Sine, cosine, and tangent of an angle in degrees.

Sector area and arc length from the radius and the angle.

Volume, surface area, and the diagonal of a rectangular box.

Volume of a pyramid with a square base.

The arithmetic, geometric, and harmonic means.

Compares a number with the sum of its proper divisors.

How many ways there are to write n as a sum of positive integers, ignoring order.

How many ways there are to place n distinct items into k groups that are not empty.

A mean with a weight on each number.

One unknown in the equation PV = nRT.

The angle of refraction at the boundary of two media.

The first and second cosmic speeds for Earth, Mars, and the Moon.

Flow regime in a round pipe.

The percent of actual product relative to the theoretical amount.