Bar to PSIG Converter
Convert pressure from bar to psig (pounds per square inch, gauge). Psig measures pressure above the surrounding atmosphere, so you need to say whether your bar reading is absolute or already a gauge reading. This converter handles both: pick the input type and get the equivalent gauge pressure in psig.
Formula
psig = bar(gauge) × 14.5038, or psig = bar(absolute) × 14.5038 − 14.6959
- Gauge pressure (psig) is measured relative to the surrounding atmosphere; absolute pressure (psia) is measured from a perfect vacuum.
- psia = psig + atmospheric pressure (≈ 14.6959 psi at sea level).
- If your bar value is already a gauge reading (barg), just multiply by 14.5038.
- If it's an absolute reading (bara), convert to psi and then subtract one atmosphere to get psig.
Convert 2 bar gauge to psig
Inputs
- Pressure: 2 bar
- Bar reading is: gauge
A gauge reading of 2 barg × 14.5038 = 29.01 psig. In absolute terms that's 29.01 + 14.70 = 43.71 psia.
Frequently asked questions
What is the difference between psi and psig?
Psi is a generic pressure unit; psig specifically means gauge pressure — pressure above the local atmosphere. A tyre gauge reads in psig because it shows pressure relative to the air around it.
How do I convert bar to psig?
If the bar value is a gauge reading, multiply by 14.5038. If it's absolute, multiply by 14.5038 and then subtract about 14.6959 psi for atmospheric pressure.
What is psia?
Psia is absolute pressure — measured from a perfect vacuum. It equals psig plus atmospheric pressure (about 14.6959 psi at sea level).
Which should I use, gauge or absolute?
Most everyday gauges (tyres, compressors) read gauge pressure (psig). Use absolute (psia) when calculations involve a vacuum or vary with altitude.