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Math Formulas > Geometry > Perimeter of a Circle

Perimeter of a Circle



r: radius
d: diamter
P: perimeter

The perimeter of a circle is given by:
P = 2 ∙ Π ∙ r or P = Π ∙ d

Π defines the ratio of any circle's circumference to its diameter and is approximately equal to 3.141593, however the value 3.14 is often used.

Example 1: The perimeter of a circle that is 6 meters in diameter is:

P = Π ∙ d = 3.14 ∙ 6 = 18.84 m


Example 2: The perimeter of a circle that is 6 meters in radius is:

P = Π ∙ d = 2 ∙ 3.14 ∙ 6 = 37.68 m

Online Perimeter Calculator, click on the link will open a new window.

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