Circle Calculator
Enter any one value (radius, diameter, circumference, or area) to automatically calculate all other circle properties.
Input Values
Enter any one property of a circle.
Circle Visualization
Formulas
Circle calculation formulas reference
Diameter (d = 2r)
d = 2rCircumference (C = 2πr)
C = 2πrArea (A = πr²)
A = πr²Circle Properties
The radius is the distance from the center to the edge of the circle. The diameter is a line segment passing through the center, twice the radius. Circumference is the total length of the circle's edge, and area is the space enclosed by the circle. π (pi) is the circle constant, approximately 3.14159.