Square Inches Calculator

To calculate the area in square inches, enter the length and width in the calculator below.

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How to Calculate Square Inches

Square inches are an area measurement of a space in inches squared. One square inch is equal to the area of a square with each side equal to one inch.

Of course, not all areas are a perfect square. You can calculate square inches in a few easy steps.

Step One: Measure the Length and Width

The first step to calculate square inches is to measure the length and width of the area in inches using a ruler or tape measure.

If your measurement is in another unit of measure, such as centimeters, then you’ll need to convert to inches first. Use our length converter to convert dimensions to inches.

Step Two: Multiply the Length and Width

The next step is to multiply the length and width to get the result in square inches. The square inches formula is:

square inches = length × width

You can also use our area calculator to find the area of more complex shapes.