# Calculating Window Footage?

Originally Posted By: Kevin Blackwell
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I am searching for the formula to calculate the window footage for an emergency egress window (24"x 20")

I was told that ( length x width divide by 12 )is the formula is this correct
and what would be the square footage for a 24x20 window?
Thx Kevin from Houston,TX

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Kevin

144 square inches in a square foot

Paul

Originally Posted By: Kevin Blackwell
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Paul,

Thanks if it’s 144 square inches would the footage be 12 feet?

Originally Posted By: Guest
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20x24=480 divided by 144 =3.33 square feet

Originally Posted By: Susan
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Kevin,

I know this is after the fact but....keep in mind that the 24x20 measurements are only minimums. The window for emergency egress in a bedroom/sleeping room on grade level must be 5 sf of openable area. This 5 sf must be at least 20 inches wide and 24 inches high. The area for a second story bedroom/sleeping room area increases to 5.7 sf. Again this second story window has to also meet the minimum width and height requirements. I know it is quite confusing.

For sake of example: grade level window used for emergency egress (only one window in each bedroom/sleeping area must meet the code) is 1.5 feet (18 inches) wide and 4 feet high (48 inches). You'd meet the sf requirement (4x1.5=6sf), but not the minimum width requirement.

Hope that makes sense!!

Sue