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Mathematics

Sphere Calculator

Sphere Calculator

r =

Variable Legend

r= radiusd= diameter = 2rV= volumeSA= surface areaπ= ≈ 3.14159…

Given radius r

Calculate volume, surface area, and diameter.

Volume
Surface area
Diameter

Given diameter d

Calculate volume and surface area from diameter.

Volume
Surface area

Given volume V

Find radius and surface area from volume.

Radius
Surface area
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Pro Tip

Always verify your input values before calculating. For sphere, small input errors can compound and significantly affect the final result.

Difficulty:Intermediate

Did you know?

A sphere is the only shape where the surface area in square units equals the volume in cubic units when r = 3 (SA = 4π·9 = 36π, V = (4/3)π·27 = 36π).

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Reviewed May 2026
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