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 calculator or a radius to the …

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.

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 square units.

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 circle to the edge, use the formula …

The surface area of a circle is absolutely the same as the area of the circle. Surface area is an expression that is usually associated with 3-D figures such as a sphere. Since a circle is not a 3-D …

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 unknowns. Circle formulas and …

Area of a circle The area of a circle is the plane region bounded by the circle's circumference. The region shaded in gray inside of circle A above is its area. The area of a circle can be found using the …

Dec 9, 2025 · Area of a Circle: A Complete Guide The Knowledge Academy 09 December 2025 The Area of a Circle is the space enclosed within its boundary, calculated using the formula A = πr², …

Jan 17, 2026 · Calculate circle area instantly using radius, diameter, or circumference. Step-by-step solutions with π formulas. Free tool with real-world examples.

May 8, 2024 · In math, it is important to be able to calculate the area of a shape (i.e. the total space that a shape takes up) by using a formula. When it comes to finding the area of a circle, you can easily …