Circle Calculator
Calculate circle properties, visualize measurements, and understand circle geometry with our interactive calculator.
Circle Properties
Calculation Results
Diameter: 20.00 cm
Circumference: 62.83 cm
Area: 314.16 cm²
Circle Formulas
Diameter (d)
d = 2 × r
Circumference (C)
C = 2 × π × r
Area (A)
A = π × r²
Circle Visualization
Properties Comparison
Common Radii
About Circles
What is a Circle?
A circle is a shape consisting of all points in a plane that are at a given distance from a given point, the center. The distance between any point of the circle and the center is called the radius.
Applications
Circle calculations are essential in many fields including engineering, architecture, physics, and everyday applications like calculating wheel rotation, circular areas, and container volumes.