How many square inches are in one square foot?

One square foot is defined as a square that measures one foot on each side. Since there are 12 inches in one foot, to calculate the area in square inches, you multiply the length and the width in inches. Thus, for one square foot, the calculation is:

12 inches (length) x 12 inches (width) = 144 square inches.

This is why the answer is 144 square inches. Each square foot contains a total of 144 small squares of 1 inch by 1 inch. A clear understanding of this conversion is essential in carpentry and woodworking, as measurements in projects often need to be converted between different units of area.