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Sphere Calculator
Find the volume, surface area and circumference of a sphere from its radius.
Sphere calculator
Diameter: —
Circumference: —
Surface area: —
Volume: —
Hemisphere volume: —
How to use the Sphere Calculator
- Enter the radius of the sphere.
- Check the diameter, circumference and area as they update.
- Read the volume and hemisphere volume in the panel.
Features
- Volume from the radius
- Surface area and circumference
- Diameter and hemisphere volume
- Runs locally, no uploads
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Frequently Asked Questions
Common questions about the free online sphere calculator.
Enter the radius. The tool uses four thirds of pi multiplied by the radius cubed and shows
the volume instantly for you.
Volume equals four thirds multiplied by pi and by the radius cubed, usually written as V =
4/3 pi r cubed.
Surface area is four times pi times the radius squared, and the tool also lists the diameter
and circumference.
In geometry a sphere is only the curved surface, while a ball includes the solid interior,
but both share the same volume formula.
The panel shows the hemisphere volume automatically. It is exactly half of the full sphere
volume for the same radius.
No. All sphere calculations happen locally in your browser, so nothing you enter is ever sent
anywhere.
Yes. The calculator is fully responsive and works on desktop, tablet and phone screens of any
size.
Yes. The sphere calculator is free to use, unlimited and needs no account, sign-up or
installation.
Last updated: October 10, 2026