Area of a Circle Calculator

Welcome to the Area of a Circle Calculator! This tool helps you calculate the area of a circle based on its radius or diameter. The area of a circle is a fundamental concept in geometry.

Simply input the radius or diameter of the circle, and the calculator will compute the area using the formula A = πr². It's a convenient way to find the area of circles for various applications.

Explore the calculator below and calculate the area of a circle:

Radius (if known):
Diameter (if known):