Circle Calculator

Please provide any value below to calculate the remaining values of a circle.

Result

About Circles

A circle is a simple closed shape where all points in a plane are equidistant from a center point. Key parameters include radius, diameter, circumference, and area.

Circle Formulas

D = 2R
C = 2πR
A = πR²
where R: Radius, D: Diameter, C: Circumference, A: Area, π ≈ 3.14159

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Circle Calculation Tips

  • Provide only one input (radius, diameter, circumference, or area).
  • Ensure the input is a positive number.
  • Use the Print button to save results as a PDF.