Sphere Calculator
Volume & Surface Area ⚡
Enter any one value — radius, diameter, volume, or surface area — and instantly calculate all the others.
Enter any one value — radius, diameter, volume, or surface area — and instantly calculate all the others.
Volume: V = (4/3) × π × r³
Surface Area: A = 4 × π × r²
Radius from volume: r = ∛(3V ÷ 4π)
Radius from surface area: r = √(A ÷ 4π)
How does volume scale with radius?
Volume scales with the cube of the radius. Double the radius and the volume increases eightfold. This is why small changes in radius have a large impact on volume.
What is the surface area of a sphere used for?
Surface area calculations are used in manufacturing, packaging design, heat transfer engineering, and astronomy for calculating the surface of planets and stars.