Free online Circle Calculator. Part of our comprehensive Math Calculators suite.
Loading...
Found this tool helpful? Share it with your friends!
The Circle Calculator is an intuitive, free online tool designed to quickly and accurately compute all essential properties of a circle. By simply inputting one known value—be it the radius, diameter, circumference, or area—our calculator instantly determines the remaining properties. This tool leverages fundamental geometric formulas like $C = 2\pi r$ and $A = \pi r^2$ to deliver precise results. Ideal for students tackling geometry problems, engineers performing design calculations, architects, and anyone requiring reliable circular measurements, it streamlines the process of obtaining critical data. Part of our extensive suite of mathematical calculators, the Circle Calculator ensures efficiency and accuracy for various academic and professional applications.
Diameter
10.00
π Constant
3.14159
Area (πr²)
78.540
Circumference (2πr)
31.416