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).

Know More

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).

## Related Questions

• A:

The average professional heavy weight boxer hits at between 1,200 to 1,700 pounds per square inch, or psi. Legendary boxer Mike Tyson had a punch that was measured at 1,800 psi, or almost one ton of force per square inch.

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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.

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• A:

Residential water pressure should not exceed 80 pounds per square inch, or psi, and outdoor irrigation systems typically have a water pressure of 30 to 50 psi. Sometimes water is supplied to houses at 100 or even 150 psi.