Calculate the circumference of a circle from radius, diameter, or area with MaiCalcs. Perfect for geometry problems and real-world measurements.
• Circumference: C = 2πr = πd
• Area: A = πr²
• Diameter: d = 2r
• Radius: r = C/(2π)
• r = 5cm → C = 31.42cm
• d = 10m → C = 31.42m
• C = 20in → r = 3.18in
Enter a value to calculate circle properties