Circle Calculator

Calculate circle area, circumference, diameter with step-by-step explanations.

Enter Circle Data

About Circle Calculations

What is a Circle?

A circle is a perfectly round shape where all points on the boundary are equidistant from the center point. The distance from the center to any point on the circle is called the radius.

Key Properties

  • Radius: Distance from center to any point on the circle
  • Diameter: Distance across the circle through the center (2 × radius)
  • Circumference: Distance around the circle
  • Area: Space enclosed by the circle

Real-World Applications

  • Engineering: Wheel and gear calculations
  • Architecture: Circular structures and designs
  • Physics: Orbital motion and circular paths
  • Manufacturing: Pipe and container measurements