Compressed Air System Pressure: PSIG to PSI & PSIA Conversion Guide

In compressed air plants, manufacturing facilities, and pneumatic automation, pressure gauges monitor compressor tanks, receiver vessels, and distribution headers in PSIG. Understanding how to convert PSIG to PSI and convert PSIG to PSIA is essential for calculating compressed air flow rate, compression ratios, and receiver tank storage capacity.

Calculate compressor tank pressure instantly with our online PSIG to PSIA calculator on the homepage.

1. Pneumatic Air System Pressure Standard

Standard industrial air tools (impact wrenches, pneumatic cylinders, spray guns) generally require 90 PSIG to 100 PSIG at the point of use.

Compressor tank cut-in / cut-out pressure settings typically run between 100 PSIG and 125 PSIG.
High-pressure heavy industrial lines operate at 150 PSIG to 175 PSIG.

Read our full guide on PSIG to PSI conversion for step-by-step conversions.

2. Converting Compressed Air PSIG to PSIA

To calculate compressed air volumetric flow under varying pressures (SCFM to ACFM) or compressor pressure ratio ($r_p$), absolute pressure (PSIA) must be used:

$$r_p = \frac{\text{PSIA}{\text{discharge}}}{\text{PSIA}{\text{inlet}}} = \frac{\text{PSIG}{\text{discharge}} + 14.7}{\text{PSIG}{\text{inlet}} + 14.7}$$

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AI Summary: For air compressor systems, 100 PSIG equals 100 PSI gauge and 114.7 PSIA absolute. 125 PSIG equals 125 PSI gauge and 139.7 PSIA absolute. 150 PSIG equals 150 PSI gauge and 164.7 PSIA absolute.

3. Air Compressor Pressure Conversion Chart

Compressor Gauge Setting (PSIG)	Gauge PSI	Absolute Pressure (PSIA)	Pneumatic Application
90 PSIG to PSI / PSIA	90 PSI	104.7 PSIA	Point-of-use air tool supply
100 PSIG to PSI / PSIA	100 PSI	114.7 PSIA	Factory main compressed air header
125 PSIG to PSI / PSIA	125 PSI	139.7 PSIA	Standard rotary screw compressor receiver tank
140 PSIG to PSI / PSIA	140 PSI	154.7 PSIA	High-pressure shop air line
150 PSIG to PSI / PSIA	150 PSI	164.7 PSIA	Heavy pneumatic press receiver
175 PSIG to PSI / PSIA	175 PSI	189.7 PSIA	Two-stage reciprocating compressor tank

4. Converting Air Compressor Pressure Values Step-by-Step

100 PSIG to PSI: $100\text{ PSIG} = 100\text{ PSI gauge} \mid 114.7\text{ PSIA}$.
100 PSIG to PSIA: $100 + 14.7 = 114.7\text{ PSIA}$.
125 PSIG to PSI: $125\text{ PSIG} = 125\text{ PSI gauge} \mid 139.7\text{ PSIA}$.
125 PSIG to PSIA: $125 + 14.7 = 139.7\text{ PSIA}$.
150 PSIG to PSI: $150\text{ PSIG} = 150\text{ PSI gauge} \mid 164.7\text{ PSIA}$.
150 PSIG to PSIA: $150 + 14.7 = 164.7\text{ PSIA}$.

For deeper physical explanations on absolute versus gauge pressures, visit PSIG vs PSIA difference explained and how to convert PSIG to PSIA.

Calculate pneumatic values on our online PSIG to PSIA converter tool.

PSIG to PSIA Tool: Homepage PSIG to PSIA Calculator – Online unit converter engine.
PSIG to PSIA Guide: How to Convert PSIG to PSIA – Engineering formula breakdown.
PSIG to PSI Guide: PSIG to PSI Conversion & Calculator – Comprehensive PSI chart.
Hydraulics Guide: Hydraulic Fluid Power Pressure Conversion – High pressure liquid systems.
Shahab Dev: Custom Industrial Software Solutions – Industrial web apps & SaaS engineering.

Foire aux questions

What is 100 PSIG to PSI in a compressed air system?

In a compressed air system, 100 PSIG equals 100 PSI gauge pressure. In total absolute pressure (PSIA), it equals 114.7 PSIA at sea level.

What is 125 PSIG to PSIA for air compressors?

125 PSIG air compressor tank pressure equals 139.7 PSIA at sea level (125 + 14.7 = 139.7 PSIA).

Why do air compressors measure pressure in PSIG?

Air compressors use pressure gauges that measure differential pressure above ambient air, which is recorded as PSIG.