855 square feet.
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Each square foot contains 144 square inches; note that one linear foot equals 12 inches.
30 feet by 28 feet equals 840 square feet. 30 inches by 28 inches equals 840 square inches, or 5.833 square feet.
Inches is a linear measurement and square feet is an area.It is an apples and oranges things.BUT, if you want square inches to square feet, use this:1 square inches = 0.00694444444 square feet
864 square inches
Approximately 8.392 square feet.