Reviewed by CalcMulti Editorial Team·Last updated: ·← Geometry Hub
A sphere is a perfectly round 3D shape where every point on the surface is equidistant from the center. Its volume is V = (4/3)πr³ and its surface area is SA = 4πr².
The sphere has the smallest surface area for any given volume among all 3D shapes — which is why soap bubbles and water droplets form spheres (surface tension minimizes area). This also explains why planets and stars are spherical under gravity.
This calculator finds sphere volume and surface area from the radius. Enter the diameter (d = 2r) and it converts automatically. Also calculates hemisphere (half-sphere) values.
V = (4/3) × π × r³
V = πr²h — volume and surface area
Cone Volume CalculatorV = (1/3)πr²h — cone volume and slant height
Rectangular Prism VolumeV = l×w×h — box volume
Surface Area CalculatorAll 3D shapes — cube, cylinder, sphere, cone
Circle Area CalculatorA = πr² — 2D circle area and circumference
Polygon Area CalculatorRegular polygons with 3–12 sides
This calculator is for educational purposes only and does not constitute professional advice. Results are based on standard mathematical formulas. Always verify critical calculations with a qualified professional before making important decisions.