Calculator
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Enter positive or negative for vacuum gauge values.
Default is sea-level standard: 14.6959 psi (101.325 kPa).
Result: — psig
Also: — psia
Formula Used
Constant: 1 bar = 14.5037738 psi
- Gauge → PSIG:
psig = bar(g) × 14.5037738 - Absolute → PSIG:
psig = bar(a) × 14.5037738 − Patm(psi) - PSIA from PSIG:
psia = psig + Patm(psi)
Use gauge when your bar value is already relative to atmosphere. Use absolute when your bar value references vacuum.
How to Use This Calculator
- Enter the pressure in bar.
- Select the correct mode: Gauge or Absolute.
- For absolute, set ambient pressure (psi) or keep default.
- Click Convert to see PSIG and PSIA.
- Click Add to Table to log the result.
- Use Export CSV or Export PDF for downloads.
Conversion Log
PSI per bar constant: 14.5037738
| # | Bar | Mode | Ambient (psi) | PSIG | PSIA | Timestamp |
|---|
Example Data Table
| bar (g) | psig |
|---|---|
| 0.5 | 7.251887 |
| 1 | 14.503774 |
| 2 | 29.007548 |
| 3 | 43.511321 |
| 5 | 72.518869 |
| 10 | 145.037738 |
Common Conversion Values (bar ⇄ psig)
| bar | psig (gauge) | bar | psig (gauge) |
|---|---|---|---|
| 0.1 | 1.450377 | 4 | 58.015095 |
| 0.2 | 2.900755 | 6 | 87.022643 |
| 0.3 | 4.351132 | 8 | 116.030190 |
| 0.7 | 10.152641 | 12 | 174.045286 |
Multiply any bar(g) value by 14.5037738 to get psig.
Gauge vs Absolute Quick Reference
| Input Type | Formula to PSIG | When to Use |
|---|---|---|
| Gauge (barg) | psig = barg × 14.5037738 |
Most instruments that read relative to atmosphere. |
| Absolute (bar(a)) | psig = bar(a) × 14.5037738 − Patm(psi) |
When referencing vacuum as zero; needs ambient pressure. |
| PSIA | psia = psig + Patm(psi) |
Absolute pressure; add atmosphere to psig reading. |
Frequently Asked Questions
PSIG means pounds per square inch gauge—pressure relative to local atmospheric pressure, not vacuum.
One bar equals 14.5037738 pounds per square inch. Multiply bar(g) by this constant for psig.
Use psig = bar(a) × 14.5037738 − atmospheric pressure (psi). Enter ambient pressure or use the default.
Sea‑level standard is 14.6959 psi. At higher elevations, atmospheric pressure is lower; adjust if needed.
Yes. Negative psig indicates vacuum (pressure below ambient). Enter negative gauge values when appropriate.
The constant is precise to at least seven decimals. Display rounding is cosmetic; internal math preserves precision.
Yes. Use the CSV or PDF buttons to download a portable report of your logged conversions.
PSIG to Bar Reverse Lookup
| psig | bar (gauge) |
|---|---|
| 5 | 0.344738 |
| 10 | 0.689476 |
| 25 | 1.723689 |
| 50 | 3.447379 |
| 75 | 5.171068 |
| 100 | 6.894757 |
| 150 | 10.342136 |
| 200 | 13.789515 |
Divide psig by 14.5037738 to get bar(g).
Unit Equivalents Reference
| Quantity | Equals |
|---|---|
| 1 bar | 14.5037738 psi = 100 kPa = 0.1 MPa ≈ 0.986923 atm |
| 1 psi | 0.0689476 bar = 6.894757 kPa |
| 1 psig to psia | psia = psig + atmospheric pressure (psi) |
| 1 barg to bara | bara = barg + atmospheric pressure (bar) |
Use these constants to cross-convert units when needed.