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.

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.

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 …

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 …

Using A = πr2, The formula for the area of a circle can be proven in a number of ways. One such way involves breaking the circle into equal sectors and rearranging them to construct a …

Jul 2, 2025 · This calculator determines the area of a circle using either the radius or the diameter. You may also enter a custom value for π, or use the default value of 3.14159.

In this guide, we’ll explore what the area of a circle means, how to derive its formula, and how to apply it step-by-step with examples. You’ll also see how the area connects to other circle …

This calculator will calculate the area of a circle given its diameter, using the famous formula area = pi times (d/2) squared. It supports different units such as meters, feet, and inches. Just type …

May 8, 2024 · Are you ready to learn how to find the area of a circle? This free step-by-step guide will teach you how to find the area of a circle with diameter or radius given.