Free Online Circumference to Radius Calculator

Determine Circle Radius from Circumference

Enter the circumference of the circle.
Select the unit for your measurements.

Unlock the secrets of circles with our **Circumference to Radius Calculator**! This intuitive tool helps you instantly determine the radius of a circle when you know its circumference. Perfect for geometry, design, and engineering tasks, it simplifies complex calculations, providing accurate results in seconds. Say goodbye to manual formulas and get precise measurements effortlessly.

Formula:

Circumference to Radius Formula

The relationship between a circle's circumference (C) and its radius (r) is fundamental in geometry. The formula for circumference is:

C = 2πr

To find the radius (r) from the circumference (C), we rearrange this formula to:

r = C / (2π)

Where:

  • C = Circumference of the circle
  • r = Radius of the circle
  • π (Pi) ≈ 3.14159265359 (a mathematical constant)

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