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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.
Then, add the two planes together to derive the total square footage of the roof: 1  Plane 1: 120' x 100' = 12,000 sq. ft. 2  Plane 2: 120' x 100' = 12,000 sq. ft. 3  Plane 1 + Plane 2 = 24,000 sq. ft. for the total square footage of the roof. Roof surfaces are measured in squares. A square is an area of roof which measures 100 square feet. To determine the number of squares on the gable roof above, simply divide its total of 24,000 square feet by 100. The result is 240, and this means you would need 240 squares of shingles to cover that roof.