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How to Calculate Area of Circle

Calculate the area of a circle using radius or diameter.

The Formula

A = πr²

The area of circle formula uses the mathematical relationship: A = πr². Each variable in the formula represents a measurable quantity that affects the final result.

Step-by-Step Method

  1. 1Identify all input values needed for the area of circle calculation.
  2. 2Substitute your known values into the formula: A = πr².
  3. 3Perform the arithmetic operations in the correct order (PEMDAS/BODMAS).
  4. 4Check that your result has the correct units and is within a reasonable range.
  5. 5Verify using the interactive Area of Circle Calculator to confirm your answer.

Related Topics

circleareageometry

Use the Interactive Calculator

Skip the manual math — get instant results with our free Area of Circle calculator.

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