Circumference of a Circle

Output: Press calculate

Formula:C = 2 × π × r

Introduction to Circumference of a Circle Calculator

The circumference of a circle is calculated by multiplying its radius by 2 and then by π. In this formula, C represents the circumference of the circle, and r is the radius of the circle. The result is expressed in the same units as the radius.

Parameter usage:

Example valid values:


Data validation

The number should be greater than or equal to zero.


This calculator takes into account the radius of a circle and outputs its circumference. It is not specific to a particular unit of measurement.

Tags: Geometry, Circle, Circumference