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Home/Math Calculators/Circle Calculator

Circle Calculator

Calculate circle properties

Radius

Result

Area78.53981634

Circumference31.41592654

Diameter10

Math

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Written by the EachTools Team

Last updated: January 2026

How Circle Properties Are Calculated

A circle's properties — circumference, area, diameter, and radius — are all related through the constant π (pi ≈ 3.14159).

Formula

Circumference = 2πr = πd
Area = πr²
d = 2r

Steps

Enter either the radius or diameter.
View the circumference, area, diameter, and radius.