Input Values
Result
Select an input type, enter a value, and click Calculate.
About Circle Calculations
A circle is a perfect round shape where all points are equidistant from the center. Key formulas:
- Diameter: d = 2r
- Circumference: C = 2πr = πd
- Area: A = πr²
Where r is the radius, d is the diameter, C is the circumference, and A is the area.
Note: π ≈ 3.14159265359