What is the Square Inches of a Rectangle Calculator?
This tool computes the area of any rectangle measured in inches. Enter the length and width in inches and it returns the surface area in square inches (in²), along with a bonus conversion to square feet. It's handy for tiling, fabric cutting, picture framing, sheet material estimation, and any project where measurements come in inches.
How to use it
Measure the two sides of your rectangle in inches. Type the longer side as the length and the shorter side as the width (the order doesn't actually matter for area). Press calculate and the result shows the total square inches plus the equivalent square feet.
The formula explained
The area of a rectangle is simply length times width: $$A = l \times w$$. Because both measurements are in inches, the product is in square inches. To convert to square feet, divide by 144, because one square foot equals \(12 \text{ in} \times 12 \text{ in} = 144 \text{ in}^2\).
Worked example
Suppose a rectangular panel is 12 inches long and 8 inches wide. Multiply: $$12 \times 8 = 96 \text{ square inches}.$$ To express that in square feet, divide by 144: $$96 \div 144 = 0.6667 \text{ ft}^2.$$ So the panel covers 96 in² or about 0.67 ft².
FAQ
Does it matter which side I call length? No. Multiplication is commutative, so \(12 \times 8\) and \(8 \times 12\) both give 96 in².
How do I convert square inches to square feet? Divide by 144. There are 144 square inches in one square foot.
Can I use decimal inches? Yes. You can enter fractional measurements such as 10.5 inches, and the calculator handles them precisely.
