How to convert bar to psi
psi = bar × 14.5037738 Multiplying by 14.5 is accurate enough for tyres and gets you there in your head: 2 bar is about 29 psi. The exact figure is 29.0075 psi.
Need to convert in the opposite direction? Use the PSI to Bar Converter. For other pressure units, use the Pressure Conversion Calculator.
Worked examples
- 1 bar to psi: 1 × 14.5037738 = 14.5038 psi
- 2 bar to psi: 2 × 14.5037738 = 29.0075 psi
- 2.5 bar to psi: 2.5 × 14.5037738 = 36.2594 psi
- 3 bar to psi: 3 × 14.5037738 = 43.5113 psi
Note that 2 bar comes to 29.0075 psi, not 29.0076 — doubling the rounded 14.5038 would round twice and give the wrong last digit. The converter above works from the exact value and rounds once.
Bar to PSI conversion table
| bar | psi |
|---|---|
| 0.5 bar | 7.2519 psi |
| 1 bar | 14.5038 psi |
| 1.5 bar | 21.7557 psi |
| 2 bar | 29.0075 psi |
| 2.2 bar | 31.9083 psi |
| 2.5 bar | 36.2594 psi |
| 3 bar | 43.5113 psi |
| 3.5 bar | 50.7632 psi |
| 4 bar | 58.0151 psi |
| 4.5 bar | 65.2670 psi |
| 5 bar | 72.5189 psi |
| 6 bar | 87.0226 psi |
| 7 bar | 101.5264 psi |
| 8 bar | 116.0302 psi |
| 8.5 bar | 123.2821 psi |
| 10 bar | 145.0377 psi |
| 12 bar | 174.0453 psi |
| 15 bar | 217.5566 psi |
| 20 bar | 290.0755 psi |
| 25 bar | 362.5943 psi |
| 30 bar | 435.1132 psi |
Typical pressures in bar and psi
- Car tyres: 2.1–2.4 bar, about 30–35 psi.
- Espresso machine: 9 bar, about 130 psi.
- Residential water supply: often around 3–4 bar, or 45–60 psi.
- Bicycle road tyres: 6–9 bar, about 87–130 psi.
- Sea-level air pressure: 1.01325 bar, about 14.7 psi.
Bar, millibar and atmospheres
A bar is exactly 100,000 pascals, a convenient round metric value close to standard atmospheric pressure. A standard atmosphere is 101,325 pascals, about 1.3% more than a bar. A millibar is a thousandth of a bar, and equal to a hectopascal, which is why weather charts quote both.
Frequently asked questions
What is 1 bar in psi?
1 bar is 14.5037738 psi, usually rounded to 14.5 psi for everyday use.
What is 2.5 bar in psi?
2.5 bar is 36.2594 psi. This is within the pressure range used for some vehicle tyres, depending on the vehicle and load.
How do I convert psi back to bar?
Divide by 14.5037738 instead of multiplying. The converter above has a swap button that reverses the direction and carries the result across, or you can use the dedicated PSI to Bar Converter.