Click save settings to reload page with unique web page address for bookmarking and sharing the current tool settings, or click flip tool to reverse the tool function with current settings

Switch tool with the current settings for diameter, and calculate sphere volume, circle area, circle circumference or radius instead

## Related Tools

- Calculate surface area of sphere from diameter
- Sphere volume to diameter calculator
- Convert an area to different units
- Length and distance converter
- Circle area to diameter calculator
- Circle circumference to diameter calculator
- Circle radius to diameter calculator

## User Guide

This tool will calculate the diameter of a sphere from the surface area, and will convert different measurement units for surface area and diameter.

#### Formula

The formula used to calculate the sphere diameter is:

ø = √(A / π)

###### Symbols

- ø = Sphere diameter
- A = Sphere surface area
- π = Pi = 3.14159…

#### Surface Area of Sphere

Enter the surface area of a sphere. The sphere surface area represents the total area of the outer surface of the sphere if it was to be laid out flat as a two-dimensional shape, e.g. a true scale map of the world is a 2D scaled representation of the surface area of the world.

#### Diameter of Sphere

This is the diameter of the sphere which corresponds to the volume specified. The diameter of a sphere is the length of a straight line drawn between two points on the surface of the sphere, where the line also passes through the centre of the sphere.