What is the formula for the volume of a sphere?

Volume equals four-thirds times pi times the radius cubed (V = 4/3 · π · r³).

How do I find the surface area of a sphere?

Surface area equals four times pi times the radius squared (A = 4 · π · r²).

Is my data sent anywhere?

No. Every calculation runs locally in your browser and nothing is uploaded.

Sphere Calculator

Volume and surface area of a sphere from its radius.

Sphere calculator

Enter a sphere’s radius to get its volume (4/3·π·r³) and surface area (4·π·r²), plus the diameter and great-circle circumference. Keep your units consistent and the answers update instantly — all in your browser.