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.
Stretch a tape measure across the bottom of the window glass. Record the measurement in inches.
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Stretch the tape from bottom to top. Record the measurement in inches.
Multiply the two numbers together. Divide the result by 144 to get the resulting square foot measurement.