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Sphere Calculator
Enter the radius — volume and surface area update instantly.
Formula
V = 4/3·πr³ | S = 4πr²
Example
Ball bearing r = 10 mm → V = 4188.8 mm³, S = 1256.6 mm².
FAQ
Why is 4πr² the sphere area?
It follows from integrating rings over the sphere (Archimedes proved the sphere area equals the lateral area of its enclosing cylinder).
What is the volume in liters for r = 100 mm?
V = 4/3·π·100³ = 4 188 790 mm³ ≈ 4.19 L.