# 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.

## 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.