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Land & Area Calculators

Circle Area Calculator

Find the area of a circular plot, patio or table from its radius or diameter, in any unit of length.

Enter values

Results update as you type.

Result

Area

113.097336 sq units

Circumference
37.699112
Step-by-stepShow
  1. A = π × 6² = 113.097336

About the Circle Area Calculator

Find the area of a circular plot, patio or table from its radius or diameter, in any unit of length.

Also known as: area of circle, circular area, round area calculator.

How to use this calculator

  1. Enter measure, length.
  2. The result updates instantly as you type — press Calculate (or Enter) at any time.
  3. Open “Step-by-step” to see how the answer was worked out.
  4. Use Copy result or Share to save the answer or send a link with your inputs.

Formula

A = π r² = π d² / 4

Worked example

Using the values pre-filled in the calculator above:

  • Measure: Diameter
  • Length = 12

the calculator returns:

  • Area: 113.097336 sq units
  • Circumference: 37.699112

Working

  1. A = π × 6² = 113.097336