Q:

# How do you calculate PSI?

A:

The psi, or pounds per square inch, is a unit of pressure (P) using the foot-pound-second (FPS) system. To calculate psi, divide the force applied (F) with the area (A).

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1. Measure the force applied

Use an instrument such as a force gauge, spring scale or strain gauge. Make sure that the unit is in pounds. Convert the value if necessary.

2. Measure the total area on which force is applied

Measure the length and the width, and make sure that both values use the same unit, in this case inches, you can proceed to multiply them.

3. Calculate the pressure in psi

Divide the measured force (in pounds) with the measure area (in square inches).

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## Related Questions

• A:

Converting a metric unit, such as kilograms, to a U.S. Standard unit, such as pounds, is a matter of finding the correct conversion rate and multiplying. The conversion rate tells you how many of one unit equals another unit.

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• A:

"PSI" is an acronym that stands for "pounds per square inch," and it is the standard unit of measurement for pressure. When measuring tire pressure, the PSI is equal to the pounds of air pressure being exerted on a 1-square-inch area within the tire.

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• A:

Common units for pressure include the Pascal, atmosphere, bar, Torr, millimeters of mercury and pounds per square inch. These are abbreviated as Pa, atm, bar, Torr, mmHg, and psi, respectively.