Sorry, your question is comparing two incomparables: 1 foot is a measure of length, square inches measure area.
If you meant "1 square foot" the the answer is 144.
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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