Square Footage of a Circle Calculator

Calculate Your Circle's Square Footage

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Need to find the square footage of a circle for your next project? Our easy-to-use online calculator helps you accurately determine the area using either the radius or diameter. Perfect for construction, landscaping, or DIY tasks, get precise measurements instantly and understand the simple formula behind it.

Formula:

The formula to calculate the area of a circle (A) is:

A = πr2

Where:
  • A = Area (in square feet)
  • π (Pi) ≈ 3.14159
  • r = Radius of the circle

If you have the diameter (d), the radius (r) is half of the diameter (r = d/2), so the formula can also be written as:

A = π(d/2)2 = πd2/4

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