Sphere Calculator
Enter any one property of a sphere — radius, diameter, volume or surface area — and the calculator derives the other three. Useful for astronomy, chemistry, engineering and 3D modelling problems.
Enter a value
Enter a value and press Calculate.
Sphere formulas
Diameter: d = 2r
Surface area: A = 4πr²
Volume: V = (4/3)·π·r³
Great circle: C = 2πr
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Frequently asked questions
The volume of a sphere is exactly two-thirds of the volume of the smallest cylinder that contains it. That cylinder has volume πr² · 2r = 2πr³, so the sphere is (2/3) · 2πr³ = (4/3)πr³.