1 square of shingles is 100 square feet. There are 144 square inches in each square foot so there would be 14,400 sq. inches in a square. 12x12=144x100=14,400
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1 square foot contains 144 square inches
144 square inches
1 square foot = 144 square inches
1 square foot = 144 square inches x 600 = 86400 square inches
Low end $75 per square for standard 3 tab shingles