Bar to PSI Converter
Bar is the practical metric pressure unit — 100 000 pascals, almost exactly one atmosphere. PSI is what every US-spec pressure gauge reads. You hit this conversion any time you move between a European tire-inflation chart and an American pump, or read a European scuba tank in bar and plan a dive by psi. The exact factor is 1 bar = 14.5037738 psi.
How to convert bar to psi
-
1
Enter a pressure in bar
Or in psi — either field drives the other.
-
2
The tool multiplies by 14.5037738
Or divides if you entered psi.
-
3
Read the converted value
Shown to four decimals by default; switch precision for calibration work.
Exact conversion
1 bar = 100 000 Pa (by definition)
1 psi = 6 894.757 293 168 Pa (from pound-force and inch)
1 bar / 1 psi = 100 000 / 6 894.757... = 14.503 773 773 0... psi
Quick reference table
| Bar | PSI (rounded) | Use case |
|---|---|---|
| 1 bar | 14.5 psi | One atmosphere, room pressure |
| 2.2 bar | 32 psi | Typical car tire, cold |
| 3.5 bar | 51 psi | High-load car tire or SUV |
| 6.9 bar | 100 psi | Road bike tire (low end) |
| 9 bar | 130 psi | Espresso machine pump |
| 35 bar | 508 psi | Typical CO2 soda cylinder |
| 200 bar | 2900 psi | Full scuba tank at rest |
| 300 bar | 4350 psi | Full high-pressure scuba tank |
| 1013 bar | 14 700 psi | Ultra-high-pressure water jet |
Don’t confuse bar with barg
- bar (absolute) — Pressure measured from a perfect vacuum.
- barg (gauge) — Pressure above local atmospheric, what most gauges read.
Your tire at “2.2 bar” is 2.2 barg, or 3.2 bar absolute. When converting to psi, the same distinction applies: 2.2 barg = 32 psig, not 32 psia.
Weather forecasts
Meteorologists rarely talk in bar — they use millibars (1 mbar = 0.001 bar = 100 Pa) or the identical hectopascal. Sea-level standard is 1013.25 mbar / hPa, which is 14.696 psi.
Frequently Asked Questions
Almost. 1 bar = 100 000 Pa; 1 atm = 101 325 Pa. The difference is 1.3%. For rough work they are interchangeable; for calibration or scientific use they are not.
Because the units are different. A tire at 2.3 bar is at 33.4 psi. The actual pressure is the same; only the gauge units differ. The ratio is always 14.5 psi per bar.
European tanks are sold and labelled in bar (typically 200, 232 or 300 bar rated); US tanks in psi (3000, 3442 or 4350 psi). Know which one your gauge is reading before you calculate dive gas time.
Same distinction as psig and psia. Gauge pressure is measured above ambient; absolute is from vacuum. Most practical pressure readings are gauge unless a datasheet explicitly says “absolute”.
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