Convert pressure from PSI to bar, Pascal, atmospheres, and other standard pressure units.
Last updated: March 2026 | By ForgeCalc Engineering
Pounds per square inch (PSI) is a unit of pressure or of stress based on avoirdupois units. It is the pressure resulting from a force of one pound-force applied to an area of one square inch.
PSI is widely used in the United States and the UK for tire pressure, scuba tank pressure, and industrial piping systems. In the SI system, the standard unit is the Pascal (Pa), but Bar and Atmospheres are also common in engineering.
PSIG (Gauge) measures pressure relative to atmospheric pressure, while PSIA (Absolute) measures pressure relative to a vacuum. PSIA = PSIG + 14.7.
Most passenger cars have a recommended tire pressure between 30 and 35 PSI.
One standard atmosphere (1 atm) is equal to exactly 14.696 PSI.
Yes, residential water pressure is typically between 40 and 60 PSI.
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