Convert Area from Square Inch to Square Inch (in2 to in2)
Multiple conversions

What is a Square Inch (in²)?

A square inch (in²) is a standard unit of area in the imperial system, most commonly used in the United States.

To put it simply, it's the area of a square that measures one inch on each side.

For a larger comparison, it is equal to 1/144th of a square foot (ft²).

How Are Square Inches Related to PSI?

The square inch plays a vital role in one of the most commonly used pressure measurements: Pounds per Square Inch (PSI).

This unit is essential in everyday life, such as when inflating car tires or measuring water pressure in plumbing systems.

Simply put, PSI indicates the amount of force applied to a single square inch of area. This measurement is crucial for ensuring safety and optimal performance in various applications.

Converting Square Inches

Since most of the world uses the metric system, it's essential to know key conversions.

For instance, one square inch is exactly 6.4516 square centimeters (cm²).

This conversion is essential for global fields like trade, scientific research, and manufacturing. As a real-world reference, a US postage stamp measures about one square inch.

Common Uses of the Square Inch Today

While larger areas are measured in square feet or acres, the square inch remains the standard for specifying smaller surfaces.

It's commonly used in:

• Material Science: Measuring fabric density, such as threads per square inch.
• Printing & Digital Imaging: Defining resolution with standards like Dots Per Inch (DPI), which is often measured over a square inch.
• Electronics & Hardware: Specifying the size of small electronic components, hardware, and fasteners.
• Small-Scale Construction: Detailing requirements for materials like tiles or fittings.

What is the imperial system?