There are 12 inches in one foot. In one square foot, there are 144 square inches. The conversion value for square inches to square feet is 144.
To convert an area measured in square inches into square feet, divide the number of square inches by 144. For example: 200 square inches / 144 = 1.39.
The last step in converting square inches to square feet is to label the answer with the correct unit. Continuing with the example, 200 square inches equals 1.39 square feet.