Circumference to Diameter Calculator

Your details

Choose the unit for all length inputs and outputs.
Pick which value you want to calculate.
The distance around the circle (the perimeter).
cm
Diameter
10

Straight-line distance across the circle through the centre (d = C / pi)

Circumference31.416
Radius5
Area78.5402

A circumference of 31.4160 cm gives a diameter of 10.0000 cm.

  • The diameter is 10.0000 cm, exactly C / pi.
  • The radius is 5.0000 cm (half the diameter).
  • The enclosed area is 78.5402 cm^2.
  • Circumference and diameter always have the ratio pi (approximately 3.14159), no matter the size of the circle.

Next stepTo verify: multiply the diameter by pi and you should get back the original circumference within rounding.

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