What is the volume of a sphere?

The volume of a sphere is four thirds times pi times the radius cubed. For a radius of 5 that is about 523.6 cubic units. Enter the radius and the calculator works it out.

What is the surface area of a sphere?

The surface area is four times pi times the radius squared. For a radius of 5 it is about 314.2 square units. The calculator shows it alongside the volume.

How do I find the radius from the diameter?

The radius is half the diameter. So if you know the distance across the ball through its centre, divide by two and enter that as the radius.

Sphere Volume Calculator

Work out the volume and surface area of a sphere from its radius. Enter the radius and the calculator shows both straight away. If you only know the diameter, halve it first. Useful for balls, tanks, domes, and geometry study.

volume (cubic units)

Surface area0

Diameter0

The formulas

Volume = four thirds times pi times radius cubed
Surface area = four times pi times radius squared

Worked example

A sphere with a radius of 5 has a volume of about 523.6 cubic units and a surface area of about 314.2 square units. Double the radius and the volume grows eightfold.

Related calculators

Cylinder Volume Calculator: volume of a cylinder.
Cone Volume Calculator: volume of a cone.
Circle Calculator: area and circumference.
Cubic Metre Calculator: work out a volume.

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