# Radius Converter

## Convert between radius, diameter, circumference, area, sphere volume and sphere surface area

## How to use the radius converter

This converter uses the following equations based on the radius ** r**:

- Circle diameter =
**2***r* - Circle circumference =
**2π***r* - Circle area =
**π***r*^{2} - Sphere volume =
**4π***r*^{3}/3 - Sphere surface area =
**4π***r*^{2}