Pressure gauges show gauge pressure (relative to the air around them). European and engineering specs often quote bar, sometimes as absolute pressure (bar(a)), so check which one you have before converting to psig.
How to use the Bar to PSIG Converter
- Pressure
- The value is
- Atmospheric pressure
- Every result field is editable: type into Gauge pressure and Pressure plus every other field update to match.
Results update as you type, and every field accepts the units shown in its menu.
How it works
A gauge reading is simply converted to psi. An absolute reading first has atmospheric pressure subtracted.
Inputs explained
| Field | What to enter |
|---|---|
| Pressure | In bar |
| The value is | Choose one: Gauge pressure (barg), Absolute pressure (bara) |
| Atmospheric pressure | Units: psi, kPa, bar |
Example values
How the main result changes when Pressure changes and everything else stays at the example values above:
| Pressure (bar) | Gauge pressure (psig) |
|---|---|
| 1.5 | 21.756 |
| 2.25 | 32.633 |
| 3 | 43.511 |
| 3.75 | 54.389 |
| 4.5 | 65.267 |
| 6 | 87.023 |
Formula
psig = bar(gauge) × 14.503774psig = (bar(abs) − atmospheric) × 14.503774Worked example
Inputs — Pressure: 3 bar; The value is: Gauge pressure (barg); Atmospheric pressure: 14.6959 psi.
Results — Gauge pressure = 43.511 psig; Absolute pressure = 58.207 psia.
Frequently asked questions
How many psig is 1 bar gauge?
About 14.5 psig.
What is 1 bar absolute in psig?
About −0.19 psig (slightly below sea-level atmosphere).
What formula does the Bar to PSIG Converter use?
psig = bar(gauge) × 14.503774.