C
GeometryFree

Circumference Calculator

Calculate circle circumference from radius or diameter.

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Result

Enter values above and click Calculate to see your result.

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Formula

C = 2 pi r = pi d

Provide either radius or diameter to calculate circumference.

Worked Example

Radius 5 gives circumference 31.4159.

Frequently Asked Questions

Do I need both inputs?

No, radius or diameter is enough.

What value of pi is used?

The calculator uses JavaScript Math.PI precision.

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