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Convert the area to roofing squares. Because each 100 square feet of roof is one roofing square, divide the total area from Step 1 by 100. The answer is the number of roofing squares for the roof. Estimate the pitch of the roof.
Estimating. To estimate how many shingles you'll need, first estimate the total square footage of your roof's surface. To do this, measure the length and width of each plane on the roof, including dormers.Then, multiply length x width to get the square footage of each plane. Finally, calculate your roof's total square footage by simply adding the square footage of each of the planes together.For example, this shed roof has one roof plane. Simply measure length (A) x width (B): A x B = 120' x 100' = 12,000 sq. ft. for the total square footage of the roof. This gable roof has two planes.inally, calculate your roof's total square footage by simply adding the square footage of each of the planes together. For example, this shed roof has one roof plane. Simply measure length (A) x width (B): A x B = 120' x 100' = 12,000 sq. ft. for the total square footage of the roof. This gable roof has two planes.