PSIG to PSIA Conversion Chart: Complete High-Density Pressure Lookup Table

This PSIG to PSIA conversion chart provides a fast, high-density engineering reference table for translating gauge pressure readings into exact absolute pressure values ($P_{\text{abs}} = P_{\text{gauge}} + 14.7$). Whether calibrating pressure transducers, checking HVAC manifold gauges, or running boiler calculations, using a reliable PSIG to PSIA conversion chart prevents costly conversion errors.

If you need a custom or dynamic calculation with live elevation adjustments, try our free online PSIG to PSIA calculator on the home page.

1. Master PSIG to PSIA Conversion Chart (-14.7 to 5,000 PSIG)

This master PSIG to PSIA conversion chart covers standard vacuum, atmospheric, pneumatic, steam, and high-pressure hydraulic operating regimes at sea level ($P_{\text{atm}} = 14.7\text{ psi} = 1.01325\text{ bar}$):

AI Overview Summary: PSIG to PSIA Conversion Chart

AI Direct Answer: A standard PSIG to PSIA conversion chart converts gauge pressure to absolute pressure by adding 14.7 psi at sea level ($\text{PSIA} = \text{PSIG} + 14.7$). For example, 0 PSIG = 14.7 PSIA, 30 PSIG = 44.7 PSIA, 100 PSIG = 114.7 PSIA, 125 PSIG = 139.7 PSIA, and 1000 PSIG = 1014.7 PSIA.

2. How to Read and Apply a PSIG to PSIA Conversion Chart

When utilizing a PSIG to PSIA conversion chart in real-world engineering environments, observe these three fundamental principles:

1. Verify Atmospheric Baseline: This chart assumes standard sea-level barometric pressure of 14.7 PSIA. If your plant is located at significant elevation (e.g. Denver at 5,280 ft where $P_{\text{atm}} = 12.2\text{ PSIA}$), adjust the PSIA value down by the elevation delta.
2. Vacuum Reading Identification: Values listed with negative PSIG indicate vacuum pressures below local ambient atmosphere. Absolute pressure cannot be negative ($PSIA \ge 0$).
3. Metric Unit Alignment: Bar gauge ($Bar_g$) and Bar absolute ($Bar_a$) differ by $1.01325\text{ bar}$, paralleling the 14.7 psi difference between PSIG and PSIA.

To learn more about the governing equation, see our guide on the PSIG to PSIA formula.

3. High-Resolution PSIG to PSIA Conversion Chart Intervals

For precision calibration work, examine these high-resolution incremental ranges:

Low Pressure Range: 0 to 10 PSIG in 1-PSI Steps

• 0 PSIG: $14.70\text{ PSIA} \mid 1.013\text{ Bar abs}$
• 1 PSIG: $15.70\text{ PSIA} \mid 1.082\text{ Bar abs}$
• 2 PSIG: $16.70\text{ PSIA} \mid 1.151\text{ Bar abs}$
• 3 PSIG: $17.70\text{ PSIA} \mid 1.220\text{ Bar abs}$
• 4 PSIG: $18.70\text{ PSIA} \mid 1.289\text{ Bar abs}$
• 5 PSIG: $19.70\text{ PSIA} \mid 1.358\text{ Bar abs}$
• 10 PSIG: $24.70\text{ PSIA} \mid 1.703\text{ Bar abs}$

Industrial Air Range: 80 to 150 PSIG in 10-PSI Steps

• 80 PSIG: $94.70\text{ PSIA} \mid 6.529\text{ Bar abs}$
• 90 PSIG: $104.70\text{ PSIA} \mid 7.219\text{ Bar abs}$
• 100 PSIG: $114.70\text{ PSIA} \mid 7.908\text{ Bar abs}$
• 110 PSIG: $124.70\text{ PSIA} \mid 8.598\text{ Bar abs}$
• 120 PSIG: $134.70\text{ PSIA} \mid 9.287\text{ Bar abs}$
• 130 PSIG: $144.70\text{ PSIA} \mid 9.977\text{ Bar abs}$
• 140 PSIG: $154.70\text{ PSIA} \mid 10.666\text{ Bar abs}$
• 150 PSIG: $164.70\text{ PSIA} \mid 11.355\text{ Bar abs}$

4. Related Pressure Conversion Resources

• Interactive Calculator: Homepage PSIG to PSIA Calculator – Online instant calculation tool.
• Conversion Guide: How to Convert PSIG to PSIA – Detailed examples and steps.
• Reverse Guide: How to Convert PSIA to PSIG – Reverse conversion steps.
• Conceptual Comparison: PSIG vs PSIA Difference Explained – Comprehensive physics guide.
• Elevation Adjustments: Altitude Atmospheric Pressure Guide – Altitude pressure charts.
• Shahab Dev: Enterprise SaaS & Software Development – Custom engineering software solutions.