Circle Circumference Calculator

Find the circumference of a circle, or perimeter of a circle, by using this Circle Circumference Calculator.

Radius (in units of length):
Fill in circle radius to find the circumference.

What is the circumference of a circle?

The circumference is the total distance around a circle.

To find the circumference of a circle, use this circle
circumference formula:
Circle Circumference = 2 x Pi x r

Pi = 3.1416
r = radius of the circle

The radius is a measurement of length.

Example: The circumference of a circle with a radius(r) of 3 inches is:
2 x 3.1416 x 3

Calculated out this gives a circumference of 18.8496 Inches.

Circle Radius and Diameter

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