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Circle Area from Circumference Calculator

Enter a circle's circumference to find its area, radius, and diameter.

How to use

  1. Enter your values in the fields above.
  2. Press Calculate to see your result instantly.
  3. Use the Share button to copy a link to your result.

About this calculator

Starting from a circle's circumference (C), the radius falls out of C = 2πr as r = C/(2π), and the diameter is simply twice that. Substituting the radius into the standard area formula πr² and simplifying gives a direct shortcut: area = C²/(4π) — no need to solve for the radius as an intermediate step.

This is handy whenever you can measure the outer edge of something circular but not its center — wrapping a tape measure around a pipe, a tree trunk, or a round tabletop — and need the enclosed area, radius, and diameter all from that single circumference reading.

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