Sphere Volume Calculator

This calculator works out the volume and surface area of a sphere from a single measurement, the radius, so you get both figures at once instead of working through the formulas by hand. A sphere is any perfectly round three-dimensional shape, from a ball or bearing to a dome, storage tank or scale model, and knowing its volume and surface area is useful for jobs like sizing a spherical tank, ordering coating by area, or checking a geometry assignment. Enter the radius in the Radius field; if you only know the diameter, the distance straight across the sphere through its centre, halve it first. The calculator instantly returns the volume in cubic units as the main figure, along with the surface area in square units and the diameter, so you can check your input. It applies the standard formulas: volume equals four thirds times pi times the radius cubed, and surface area equals four times pi times the radius squared. For 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, and because volume scales with the cube of the radius, doubling the radius makes the volume eight times larger rather than just double. The units are generic, so enter the radius in millimetres, centimetres or metres and read the results in the matching cubic or square units.

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