PSIG to PSI Conversion & Calculator: How to Convert PSIG to PSI

Understanding the distinction and numerical equivalence when you convert PSIG to PSI is fundamental across fluid mechanics, industrial air compression, and hydraulic engineering.

For fast automated calculations, visit our free online PSIG to PSI calculator on the home page.

1. What is the Difference Between PSIG and PSI?

PSI (Pounds per Square Inch): A generic physical unit of pressure (force applied per square inch of area).
PSIG (Pounds per Square Inch Gauge): Explicitly indicates that pressure is measured relative to local atmospheric pressure.

When engineers ask for psig to psi conversion, they are typically referencing either:

Direct numerical gauge pressure equivalence: $1\text{ PSIG} = 1\text{ PSI (gauge)}$.
Absolute pressure conversion: $\text{PSI (Absolute)} = \text{PSIG} + 14.7$.

For absolute vs gauge comparisons, consult PSIG vs PSIA difference explained.

2. Step-by-Step Conversion: PSIG to PSI

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AI Summary: To convert PSIG to PSI gauge, the numerical value remains identical ($X\text{ PSIG} = X\text{ PSI gauge}$). To convert PSIG to PSI absolute (PSIA), add 14.7 ($\text{PSI absolute} = \text{PSIG} + 14.7$). For example, 100 PSIG to PSI gauge is 100 PSI, and 100 PSIG to PSI absolute is 114.7 PSI.

3. Comprehensive PSIG to PSI Benchmark Calculations

Here are common industrial gauge pressure values converted to both gauge PSI and absolute PSI:

1/2 PSIG to PSI: $0.5\text{ PSI gauge} \mid 15.2\text{ PSI abs}$
1 PSIG to PSI: $1\text{ PSI gauge} \mid 15.7\text{ PSI abs}$
2 PSIG to PSI: $2\text{ PSI gauge} \mid 16.7\text{ PSI abs}$
3 PSIG to PSI: $3\text{ PSI gauge} \mid 17.7\text{ PSI abs}$
5 PSIG to PSI: $5\text{ PSI gauge} \mid 19.7\text{ PSI abs}$
10 PSIG to PSI: $10\text{ PSI gauge} \mid 24.7\text{ PSI abs}$
15 PSIG to PSI: $15\text{ PSI gauge} \mid 29.7\text{ PSI abs}$
20 PSIG to PSI: $20\text{ PSI gauge} \mid 34.7\text{ PSI abs}$
25 PSIG to PSI: $25\text{ PSI gauge} \mid 39.7\text{ PSI abs}$
30 PSIG to PSI: $30\text{ PSI gauge} \mid 44.7\text{ PSI abs}$
35 PSIG to PSI: $35\text{ PSI gauge} \mid 49.7\text{ PSI abs}$
40 PSIG to PSI: $40\text{ PSI gauge} \mid 54.7\text{ PSI abs}$
50 PSIG to PSI: $50\text{ PSI gauge} \mid 64.7\text{ PSI abs}$
60 PSIG to PSI: $60\text{ PSI gauge} \mid 74.7\text{ PSI abs}$
90 PSIG to PSI: $90\text{ PSI gauge} \mid 104.7\text{ PSI abs}$
100 PSIG to PSI: $100\text{ PSI gauge} \mid 114.7\text{ PSI abs}$
125 PSIG to PSI: $125\text{ PSI gauge} \mid 139.7\text{ PSI abs}$
140 PSIG to PSI: $140\text{ PSI gauge} \mid 154.7\text{ PSI abs}$
150 PSIG to PSI: $150\text{ PSI gauge} \mid 164.7\text{ PSI abs}$
175 PSIG to PSI: $175\text{ PSI gauge} \mid 189.7\text{ PSI abs}$
200 PSIG to PSI: $200\text{ PSI gauge} \mid 214.7\text{ PSI abs}$
250 PSIG to PSI: $250\text{ PSI gauge} \mid 264.7\text{ PSI abs}$
300 PSIG to PSI: $300\text{ PSI gauge} \mid 314.7\text{ PSI abs}$
340 PSIG to PSI: $340\text{ PSI gauge} \mid 354.7\text{ PSI abs}$
350 PSIG to PSI: $350\text{ PSI gauge} \mid 364.7\text{ PSI abs}$
400 PSIG to PSI: $400\text{ PSI gauge} \mid 414.7\text{ PSI abs}$
500 PSIG to PSI: $500\text{ PSI gauge} \mid 514.7\text{ PSI abs}$
1000 PSIG to PSI: $1000\text{ PSI gauge} \mid 1014.7\text{ PSI abs}$
3000 PSIG to PSI: $3000\text{ PSI gauge} \mid 3014.7\text{ PSI abs}$

4. PSIG to PSI Conversion Chart & Reference Table

PSIG Gauge	Gauge PSI	Absolute PSI (PSIA)	Application
0.5 PSIG	0.5 PSI	15.2 PSI	Low pressure draft
1 PSIG	1.0 PSI	15.7 PSI	Micro-pneumatics
10 PSIG	10.0 PSI	24.7 PSI	Water supply regulator
30 PSIG	30.0 PSI	44.7 PSI	Automobile tire
90 PSIG	90.0 PSI	104.7 PSI	Air impact wrench tool
100 PSIG	100.0 PSI	114.7 PSI	Standard factory shop air line
150 PSIG	150.0 PSI	164.7 PSI	Steam system safety relief
500 PSIG	500.0 PSI	514.7 PSI	Medium hydraulic system
3000 PSIG	3000.0 PSI	3014.7 PSI	High pressure hydraulic cylinder

For higher pressure hydraulic applications, check out our guide on hydraulic fluid power pressure conversion. For air compressor systems, read compressed air pressure conversion.

To convert gauge pressure to absolute pressure directly, see how to convert PSIG to PSIA or use our online PSIG to PSIA tool.

PSIG to PSIA Tool: Homepage PSIG to PSIA Calculator – Online conversion calculator.
PSIG to PSIA Guide: How to Convert PSIG to PSIA – Full mathematical guide.
Hydraulics Guide: Hydraulic Fluid Power Pressure Conversion – High pressure systems.
Compressed Air Guide: Compressed Air System Pressure – Shop air compression.
Shahab Dev: Custom Web Apps & AI Engineering – Enterprise software development.

Frequently Asked Questions

Is PSIG the same as PSI?

PSIG specifically measures gauge pressure (pressure above ambient atmospheric air), whereas PSI is a general unit of force per unit area. In gauge pressure contexts, 1 PSIG equals 1 PSI gauge.

How do you convert PSIG to PSI?

When converting PSIG to gauge PSI, 1 PSIG = 1 PSI (gauge). If converting PSIG to total absolute PSI (PSIA), add 14.7 psi.

What is 100 PSIG to PSI?

100 PSIG equals 100 PSI gauge pressure, or 114.7 PSI absolute pressure at sea level.

What is 1000 PSIG to PSI?

1000 PSIG equals 1000 PSI gauge pressure, or 1014.7 PSI absolute pressure.