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Circle Calculator
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Enter any one measurement to find the other three.
| Radius | 5 |
| Diameter | 10 |
| Circumference | 31.42 |
| Area | 78.54 |
Circle Formulas
- Diameter = 2 × radius
- Circumference = 2πr = πd
- Area = πr²
Every measurement of a circle can be derived from any single one of the others, since they're all connected through the radius. Enter whichever value you know and this calculator works backward (or forward) through the formulas to fill in the rest.