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Calculate Disc/Circle measurements

Calculate the Radius, Diameter, Circumference and Surface area of a Disc/Circle.
Fill in any of the boxes below to have all the other measurements instantly calculated.

Radius r
Diameter 2 × r
Circumference 2 × pi × r
Area pi × r2

Good to know

  • The measurement unit is not specified. Whether we have meters, millimeters, inches, or any other length unit, the calculation formula is the same.
  • The circumference is a special case of perimeter that is used for round objects, such as discs or spheres.