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Surface Area to Radius of Sphere Calculator

Calculate Radius of Sphere
Surface Area (A) [?]
Radius (r) [?]

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Contents

Toggle
  • User Guide
      • Formula
          • Symbols
      • Surface Area of Sphere
      • Radius of Sphere

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.

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