Circle Circumference Calculator
Calculate the circumference of a circle with ease.
Calculator
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Table of Contents
Concept
What is Circumference?
The circumference of a circle is the distance around the circle. It's the perimeter of the circle, measured in linear units such as meters, centimeters, inches, or feet.
Formula
Circumference Formula
Circle
C = 2πr
where r is the radius of the circle and π (pi) is approximately 3.14159
Steps
How to Calculate Circumference
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1Measure the radius of the circle
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2Multiply the radius by 2 to get the diameter
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3Multiply the result by π (pi)
Examples
Practical Examples
Example
A circle has a radius of 5 units.
C = 2πr
C = 2 × π × 5
C = 10π
C ≈ 31.42 units