![]() Once you have your roof’s pitch, divide the number by 12.If you don’t want to do a lot of measuring, you can use your pitch calculation to get an estimated square footage of your roof: (For example, if your rise is 4 inches, your roof’s pitch is 4 in 12.) Each rise measurement is written as “# in 12” and this is your roof’s pitch. ![]() Using your measuring tape, measure from the 12-inch mark on your level up to the bottom edge of your gable trim.After that, place your level against the gable trim and flat against the side of the house.Next, place your ladder against your house at the gable end.First, use your measuring tape to measure 12 inches on your large level and make a mark at the 12-inch line.To calculate the area of your roof, first you’ll need to calculate the pitch of it: Here, our roofing installation experts share two ways for how to calculate roof area: Measuring the Pitch If you’re in need of a new roof and want to find out how much it’ll cost, you can calculate the area of it, then use this number to estimate the cost of shingles per square foot.
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