Math Calculators

Sector Area Calculator

Calculate the area of a circular sector from its radius and central angle, in the unit of your choice.

Sector area —

About the Sector Area Calculator

A sector is the "pie slice" of a circle bounded by two radii and an arc. Its area is a fraction of the whole circle's area, proportional to the central angle. The radius and the resulting area each have their own unit selector, so you can convert freely between them.

Formula: Sector Area = (θ ÷ 360) × πr²