The area of a circle calculator helps you compute the surface of a circle given a diameter or radius. Our tool works both ways — no matter if you're looking for an area-to-radius

See How to Calculate the Area below, but first the calculator: Enter the radius, diameter, circumference or area of a Circle to find the other three.

Although often referred to as the area of a circle in informal contexts, strictly speaking, the term disk refers to the interior region of the circle, while circle is reserved for

The area of a circle is the space enclosed within the boundary of a circle. It is calculated using the formula A = πr^2, where 'r' is the radius of the circle. It is measured in s

Aug 3, 2023 · What is the Area of a Circle The area of a circle is the space occupied by the circle in a two-dimensional plane. It is expressed in square units such as m 2, cm 2,

Area is the size of a surface Learn more about Area, or try the Area Calculator.

This calculator computes the values of typical circle parameters such as radius, diameter, circumference, and area, using various common units of measurement.

Aug 1, 2025 · Calculate the area, circumference, radius and diameter of circles. Find A, C, r and d of a circle. Given any 1 known variable of a circle, calculate the other 3 unkn

Calculate the area of a circle given the radius, diameter, or circumference. Plus learn the formulas and steps to find a circle's area.

Oct 29, 2025 · You can find the area of a circle using the radius, the diameter, or the circumference. To find the area using the radius, or the length from the center of the circ