Sphere Surface Area Calculator
Compute the surface area of a sphere from its radius: A = 4πr².
Input Data
Sphere radius in any consistent length unit.
Results
314.1593
Sphere surface area = 4πr² = 314.1593.
At a glance:Sphere surface area A = 4πr² where r is the radius.
Formula
A = 4πr².
How to Use
- Enter the radius r.
- The tool returns the surface area A.
Case Studies
r = 5 → 314.16
A = 4π·25 ≈ 314.16.
FAQ
Surface area vs volume?
Surface area is the shell; volume is the interior. This tool computes surface area.
Units?
Whatever unit r uses, A is that unit squared.
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References
Content reviewed by the Calculatorism editorial team. Results are for reference only; please refer to the relevant authorities for the official figures.