How to Measure Windows for Square Feet

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Calculate the square footage of a window in just a few steps.

Measuring the square footage of windows can be useful in custom window installations or when determining the amount of add-on materials, like solar-blocking films, that are necessary to coat the windows. You can do the job quickly with just a few simple tools and calculations.


Step 1

Stretch a tape measure across the bottom of the window glass. Record the measurement in inches.

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Step 2

Stretch the tape from bottom to top. Record the measurement in inches.

Step 3

Multiply the two numbers together. Divide the result by 144 to get the resulting square foot measurement.

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