One square foot is 144 square inches. If you know the area in square inches, divide that by 144 to get square feet. If you know the area in square feet, multiply that by 144 to get square inches.
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50 sq inches is 0.347222 square ft
1,296 square inches is nine square feet.12 inches = 1 ft so 1296 inches = 108 ft
144 square inches
16x16 ft = 256 square feet = 36,864 square inches.
1 sq ft = 144 square inches