The sphere volume formula
The volume of a sphere depends only on its radius: Volume = (4/3) × π × r³. Because the radius is cubed, even a small increase in radius produces a much larger increase in volume.
How to use this calculator
Enter the sphere’s radius (the distance from its center to its surface). The calculator returns the volume, the total surface area (4 × π × r²), and the diameter.
This tool is for general math, design, and educational use.
Last reviewed August 2026