math
Sphere Calculator
Calculate the volume and surface area of a sphere from its radius, with a 3D diagram.
Volume (cubic units)
33.51
Surface area (square units)
50.27
Diagram
How it works
- 1Enter the sphere’s radius.
- 2Read the volume ((4/3)π r³) and surface area (4π r²).
- 3Check the 3D diagram for the labelled radius.
Use cases
- Find the capacity of a spherical tank or ball.
- Estimate material to cover a dome or sphere.
- Check geometry homework on spheres.
Frequently asked questions
What is the volume of a sphere?
Volume = (4/3) × π × radius³. A sphere with radius 2 has a volume of about 33.51 cubic units.
What is the surface area of a sphere?
Surface area = 4 × π × radius². A radius of 2 gives about 50.27 square units.
Can I enter the diameter instead?
Enter the radius, which is half the diameter. For a diameter of 4, enter 2.
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