Geometry
Circle area calculator
Compute the area of a circle from its radius, with unit conversion.
Enter Radius to calculate 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: Area
- Units: Use dropdowns to convert where available.
Formulas
Area
Area = π × Radius^2Related tools
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