Sphere Volume Calculator
Sphere volume calculator: enter the radius to get the volume and surface area of a sphere, with the 4/3 pi r cubed formula worked through.
Formula
Volume = 4/3 πr³
Use it from the API
curl "https://moltcalc.com/api/calc/sphere-volume?radius=4"
See the API docs for every endpoint and the input schema.
FAQ
What is the formula for the volume of a sphere?+
V = 4/3 × π × r³. A sphere with radius 4 has a volume of about 268.08 cubic units.
How do I find the surface area of a sphere?+
Surface area is 4πr², exactly four times the area of a circle with the same radius. For radius 4 that is about 201.06 square units.
What if I know the diameter instead of the radius?+
Halve the diameter to get the radius and plug that in. Because volume depends on the radius cubed, doubling the radius makes the volume eight times larger.
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