Free Online Calculators

Square Footage Calculator

Calculate square footage calculator for construction and building projects.

Understanding Square Footage

Square footage is the standard measurement for area in the US. It's used for everything from real estate listings to flooring orders. Calculating it is simple for rectangles, but trickier for complex shapes.

The Basic Formula

Area (sq ft) = Length (ft) × Width (ft)

If your measurements are in inches, divide by 144 to get square feet (Length" × Width" / 144).

Measuring Odd Shapes

L-Shaped Rooms

Divide the room into two separate rectangles.

  • Measure Rectangle A (Length × Width)
  • Measure Rectangle B (Length × Width)
  • Add them together.

Triangles & Circles

Use geometry formulas for non-rectangular spaces.

  • Triangle: (Base × Height) / 2
  • Circle: 3.14159 × Radius²

Frequently Asked Questions

How to use the Square Footage Calculator

Follow these steps to get accurate results with the square footage calculator.

  1. 1

    Enter your values

    Fill in the required input fields above. Units can be changed where available.

  2. 2

    Click Calculate

    Press the calculate button to compute results instantly in your browser.

  3. 3

    Review your results

    View the computed outputs and use related calculators for deeper analysis.

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