Sphere Volume Calculator

Enter radius to calculate sphere volume using 4/3 × π × r³.

Radius

—Sphere geometry

—Volume

—Surface area

—Great-circle circumference

—Diameter

Volume reverse solve & scale sensitivity

Calculate sphere volume from radius, reverse-solve the radius from a target volume, and show how volume changes under radius scaling.

RadiusTarget volume

—Volume

—Diameter

—Radius from target V

—Surface/volume ratio

Ready.

Radius scale	Radius	Volume	Volume multiplier

Use consistent measurements and valid geometric assumptions

Keep linear inputs in a consistent unit, verify that side lengths or coordinate points can form the stated shape, and treat sketches as explanatory unless explicitly marked to scale. Coordinate formulas can become unstable for nearly degenerate shapes, so invalid or nearly collinear inputs are rejected rather than silently returning misleading values.