Geometry
Sphere surface area calculator
Compute the surface area of a sphere (A = 4·π·r²), with unit conversion.
Enter Radius to calculate Surface area. Results update instantly as you type. Use the unit dropdowns to switch units. Try an example preset to sanity-check the tool.
About this tool
- Inputs: Radius
- Outputs: Surface area
- Units: Use dropdowns to convert where available.
Formulas
Surface area
Surface area = 4 × π × Radius^2Related tools
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