Online Tools and Calculators > Math > Area of a Circle Calculator

Area of a Circle Calculator

Radius of circle:

About Area of a Circle Calculator

The online Area of a Circle Calculator is used to help you find the area of a circle.

Area of Circle Formula

The following is the calculation formula for area of circle:

A = πr2

Where:
A = area of a circle
π = 3.141592654
r = radius of the circle

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