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Setra Blog

Mar 12, 2015 12:30:00 PM

What's the Difference Between PSI, PSIA & PSIG?

Do you know the technical differences between these three pressure measurements? If not, we've got you covered.  These differences are derived from the fact that there are different types of pressure. Different types of pressure require specific units of measurement.


PSI: Pounds Per Square Inch

PSI is the most basic unit to measure pressure. The majority of pressure transducers a

Pressure Gauge At The Gas Compressor Station

re specified in pounds per square inch. There are several different forms of measurement under PSI, some of which include: PSIG and PSIA.

1 PSI = 6,894.75729 pascals.

PSIA: Absolute Pressure

PSIA is a unit for pressure measured relative to a full vacuum. Its referred to as pounds per square inch absolute.

PSIG: Gauge Pressure

PSIG is one of the most common used and referenced forms of pressure. PSIG is the measurement of pressure relative to ambient atmospheric pressure and is quantified in pounds per square inch gauge.

See below for a side-by-side comparison of absolute and gauge pressure.


Gauge/Absolute Pressure









CLICK HERE to discover Setra's vacuum, gauge and absolute pressure transducers.




Topics: General Industrial OEM, Process/Mfg Tank Level, Water and Wastewater, Test and Measurement, Barometric, Medical, OHV, General Industrial, Alternative Fuels, Oil and Gas

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