Maths & numbers
Sphere calculator
Calculate a sphere’s volume and surface area from its radius.
A clear answer. Here’s how.
For a sphere with radius r, volume = 4πr³/3 and surface area = 4πr². All dimensions use one consistent unit; area and volume are in that unit squared and cubed.
See a worked example
Worked example
A fixed demonstration, separate from the values you enter above.
- Radius
- 3
Example result
- Volume
- 113.097335529
- Surface area
- 113.097335529
- Diameter
- 6