What is a PSI?
Definition
psi
Pounds per square inch (psi) is an imperial pressure unit widely used in the US for tire pressure, hydraulics, and gas pressure.
Unit system
Imperial
Convert psi
All pressure units
| Unit | Symbol | System |
|---|---|---|
| pascals | Pa | SI / Metric |
| kilopascals | kPa | SI / Metric |
| megapascals | MPa | SI / Metric |
| bar | bar | SI / Metric |
| millibars | mbar | SI / Metric |
| PSI | psi | Imperial |
| atmospheres | atm | Reference |
| torr | Torr | Scientific |
| mmHg | mmHg | Medical |
| inches of mercury | inHg | Aviation |
| inches of water | inH₂O | Engineering |