Circle Calculator

Instantly solve any circle property by providing just one known value.

Circle Inputs

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Radius (r)

units

Geometry Help

Input any one dimension of your circle to find all other properties instantly.

Diameter2 × r

Circumference2 × π × r

Areaπ × r²

Pi (π)≈ 3.14159

The area of a circle increases exponentially with its radius. If you double the radius, the area becomes four times larger!

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Circle Calculator

Formulas Used

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