Calculator Tool
Circle Calculator
Calculate circle area, circumference, diameter, and radius online. This free tool helps you find geometric properties instantly in your browser.
Circle Inputs
Enter any one value to calculate the others instantly.
Results Summary
Radius
0
Diameter
0
Circumference
0
Area
0
About Circle Calculations
Radius & Diameter
The radius is the distance from the center to any point on the edge. The diameter is twice the radius and passes through the center.
Circumference & Area
Circumference is the distance around the circle (2πr). Area is the total space enclosed within the circle (πr²).