Circle Calculator
Calculate circle area, circumference, diameter, and radius
Circle Properties
Results
Enter values and click Calculate to see results
About Circle Calculator
Circle Formulas
- • Area: A = πr²
- • Circumference: C = 2πr
- • Diameter: d = 2r
- • Radius: r = d/2
Sphere Formulas
- • Surface Area: S = 4πr²
- • Volume: V = (4/3)πr³