How it is calculated
Volume is four thirds of πr³. Surface area is 4πr². The calculator does not separate a solid ball from a hollow sphere: for the volume of a ball or a tank they are the same thing.
V = 4/3 πr³
Where the numbers come from
- Radius
Example
Radius 3. Volume 4/3 × π × 27 ≈ 113,1. Surface 4π × 9 ≈ 113,1.
Questions
What if the diameter is known?
The radius is half the diameter. Enter that half.
Will it work for a hemisphere?
The volume of a hemisphere is half of the result. The surface of a hemisphere that includes its base is counted differently: the curved part is 2πr² and the flat circle is πr².
Units?
A radius in meters gives a volume in cubic meters.