Sphere Volume Calculator
V = (4/3) π r³ — enter radius or diameter. Click any i for detail.
Sphere size
Radius
i
Radius
Used unless diameter is provided. |
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|---|---|
Diameter (optional)
i
Diameter
If set (>0), overrides radius as d/2. |
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Unit label
i
Unit
Display only. |
How to use this calculator
- Enter radius, or a diameter to override.
- Label units if you like.
- Read volume.
- Surface area is not included on this page.
Results explained
Sphere volume is four-thirds π times radius cubed. Providing a diameter sets r = d/2.
Quick reference: sphere volume
V = (4/3) π r³.
| Item | Detail |
|---|---|
| r = 5 | V ≈ 523.6 |
| d = 10 | same as r = 5 |
| Hemisphere | Half this volume (flat face ignored) |
| Units | Cubic units of the radius |
Educational geometry — confirm units for material estimates.
How the estimate is built
V = (4/3) × π × r³ with r = d/2 when diameter > 0.
Example scenario
r=5 → V ≈ 523.60 cubic units.
FAQ
Empty diameter field?
Radius is used.
Surface area?
4πr² — not shown here.
Ball vs sphere?
Same volume formula for a solid ball.
See cylinder?
πr²h on the cylinder page.