Enter the radius of the sphere.
Formula
Volume = 4/3 × π × r³ Surface = 4 × π × r²
Worked example
A ball with a 6 cm radius has a volume of 904.78 cm³ and a surface of 452.39 cm².
Frequently asked questions
How does the volume change if the radius doubles?
It is multiplied by 8, because the radius is cubed.
How do I get the radius from the diameter?
Divide the diameter by 2.
Is a hemisphere half the volume?
Yes, half of 4/3 × π × r³.
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Results are estimates for information only. Check important figures with a professional.