# Surface Area of a Sphere

This calculator will calculate the
*surface area of a sphere*, given the radius. However, it can also calculate the radius, given the surface area. This simple article might be useful for GCSE students.

## Formula

S = 4 π r²

This formula provides the surface area, given the radius.

## Calculator

This calculator will calculate the surface area, and the radius. As you can see, it is very simple to use and you press the relevant button.

## Find Radius

Transposing the standard formula gives the formula for the surface area.

## Radius One Unit

For a radius of one unit, the formula simplifies to 4 π.