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Contents
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User Guide
This tool will calculate the radius of a sphere from the surface area, and will convert different measurement units for surface area and radius.
Formula
The formula used to calculate the sphere radius is:
r = √(A / (4 · π))
Symbols
- r = Sphere radius
- 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.
Radius of Sphere
This is the radius of the sphere which corresponds to the volume specified. The radius is the distance between the centre and any point on the surface of a sphere.