There can be no such formula. An inch is a measure of length in 1-dimensional space while square feet are a measure of area in 2-dimensional space. The two measure different things and, according to basic principles of dimensional analysis, any attempt at conversion from one to the other is fundamentally flawed.
0.006944... square feet.
736 square inches /144 = 5.111+ square feet, or 5 square feet 16 square inches
1,440 square inches are in 10 square feet.
1,008 square inches = 7 square feet.
1058 Square Inches = 7.347222222222222 Square Feet
100 square inches = 0.69444 square feet
200 square inches are 1.39 square feet.
1,600 square feet = 230,400 square inches.
10 square feet = 1,440 square inches.
106 square inches = ~0.74 square feet.
432 square inches = three square feet.