How to Calculate  the Square Feet of your windows

Use the formulas below to calculate the cost of purchasing our products, or submit the form in the window film section for a free estimate and product samples.


The 'measurements' of any given window are the horizontal and vertical dimensions of each glass face (not including the frame). To obtain the square feet of a window, you simple multiply the length (inches) times the width (inches) and divide by 144 (square inches in a square foot). We calculate using inches because windows are usually odd sizes.
(L x W)/144 = square feet
The film must be cut out larger than the window to allow you to trim it to fit. Therefore, we suggest a minimum of one  (1) to two (2) inches over the actual dimensions for cost calculations to allow room for error and re-trimming if necessary.
Example: 
A window that is 27" x 33" would be calculated this way when adding 2" to the length and width for trimming:
((27 + 2) x (33 + 2)) / 144 = (29 x 35) / 144 = 1,015 /  144 = 7.05 square feet
If you have 4 windows that size: 4 x 7.05 = 28.20 sq ft
Perform this calculation for each window, add them all up,
and round down to get the total square feet.
i.e. 28.20 + 14.61 + 7.74 = 50.55 = 50 sq ft
Only round off after all windows are added up

We have a minimum charge of one (1) square foot per window. This means that if you have individual French or Colonial style windows that are less than one sq ft, you will need to add them up as 1 square foot. We also do not cut film to an exact measurement. We would suggest at least 1/2 inch overlap on this type of window.
 Click here to see our per square foot price list.
Write down the measurements of the windows (including the two inch overlap), add up the total square feet, pick out the film that you want, and go to the store.
It is that easy !!!

 

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