The area of a circle calculator will compute the surface of a circle using a radius or a diameter.

Aug 1, 2025 · Use this circle calculator to find the area, circumference, radius or diameter of a circle. Given any one variable A, C, r or d of a circle you can calculate the other three unknowns.

Quickly find the area of any circle with our Circle Area Calculator. Enter the radius or diameter and get accurate results instantly—ideal for students, builders, and designers.

Oct 29, 2025 · To find the area of a circle, use the formula A = π • r2, where r is the radius of the circle. If you only know the diameter of the circle, then use the formula A = π • (d/2)2 where d …

Square the radius and multiply by π. The most common method for finding area. Square the diameter, multiply by π, then divide by 4. Square the circumference and divide by 4π. The …

6 days ago · Circle Area Calculator Calculate the area of a circle from radius or diameter. Enter any value to find all circle properties instantly.

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 …

Jul 23, 2025 · In this article, we'll delve into five methods for calculating the area of a circle: using the radius, diameter, circumference, sector, and segment. Along the way, we'll cover the …

Calculate area and perimeter of circles, rectangles, and triangles instantly with our Geometric Calculator. Fast, accurate, and easy to use.

Area of a circle, formula for area explained with examples, pictures, interactive examples and quiz.