Enter the total length in inches and the total width in inches of an area to convert into square inches. This calculator can also determine the length or width given the square inches and another variable.

Inches to Square Inches Conversion Formula

The following formula is used to convert inches to square inches. 

SI = L * W
  • Where SI is the area in square inches (in^2)
  • L is the length in inches (in)
  • W is the width in inches (in)

To calculate square inches, multiply the length in inches by the width in inches.

What are square inches?

Square inches are a unit of area that describes a total area equal to 1 inch in length and 1 inch in width, hence the name, square inches.

Square inches are denoted with the symbol in2.

Example Problem

How to calculate square inches?

First, determine the length of the area in inches. To determine the area of any shape, the length and width of the perimeter must be known. In this example, the length is measured to be 50 inches.

Next, measure the total width also in inches. For this example, the width is measured to be 10 inches.

It’s important to note that square inches can be calculated from any other unit of an area using conversion. For example, if the length and width are provided in feet, multiply them together and then divide by 144 to get square inches.

Finally, calculate the total square inches using the formula above:

SI = L * W

SI = 50 * 10

SI = 500 in2