Calculators

Calculate the area of a rectangle, triangle, circle, or other common shape. Select a shape and enter the required dimensions.

Given a radius, diameter, circumference, or area, compute the other circle measures.

Compute the Euclidean distance between two points in the plane.

Below are multiple fraction calculators capable of addition, subtraction, multiplication, division, simplification, and conversion between fractions and decimals. Fields above the solid black line represent the numerator, while fields below represent the denominator.

Enter a list of numbers (comma, space, or newline separated) to compute the mean, median, mode, and range.

Percentage Calculator is a free online tool to calculate percentages.

For a right triangle with legs a and b and hypotenuse c, use a² + b² = c². Enter two sides to find the third.

Solve proportions A : B = C : D when exactly one value is missing. Enter three known values and calculate the fourth.

Find the hypotenuse from two legs, or a leg from the hypotenuse and the other leg, in a right triangle.

Round a number to a chosen number of decimal places using half-away-from-zero rounding.

Find the slope of the line through two points in the plane and see the slope-intercept form when possible.

Calculate the surface area of a rectangular box, a cylinder, or a sphere.

Compute the area of a triangle using three side lengths (Heron’s formula) or base and height.

Calculate the volume of a rectangular box, a cylinder, or a sphere. Choose a shape and enter the required dimensions.