How to convert bar to pounds per square inch
- Take the value in bar.
- Use the formula pounds per square inch = bar × 14.50377377.
- For example, 2.2 bar is 31.91 psi.
About bar and pounds per square inch
A bar is exactly 100,000 pascals (100 kPa), close to the air pressure at sea level. Multiply bar by 14.5038 to get psi. For a mental estimate multiply by 14.5, which is off by less than 0.1%.
European cars, espresso machines, pressure washers and dive cylinders are rated in bar, while US gauges and pumps read psi. You need this conversion to set tires with a US gauge or to compare a machine’s spec sheet with a US one.
Examples
- 2.2 bar (a typical car tire pressure) is 31.91 psi
- 1 bar (roughly the air pressure at sea level) is 14.5 psi
- 9 bar (the classic espresso brewing pressure) is 130.53 psi
- 200 bar (a common scuba cylinder fill) is 2,900.75 psi
Bar to pounds per square inch chart
| Bar | Pounds per square inch (psi) |
|---|---|
| 0.5 | 7.25 |
| 1 | 14.5 |
| 1.5 | 21.76 |
| 1.8 | 26.11 |
| 2 | 29.01 |
| 2.1 | 30.46 |
| 2.2 | 31.91 |
| 2.3 | 33.36 |
| 2.4 | 34.81 |
| 2.5 | 36.26 |
| 2.8 | 40.61 |
| 3 | 43.51 |
| 3.5 | 50.76 |
| 4 | 58.02 |
| Bar | Pounds per square inch (psi) |
|---|---|
| 5 | 72.52 |
| 6 | 87.02 |
| 7 | 101.53 |
| 8 | 116.03 |
| 9 | 130.53 |
| 10 | 145.04 |
| 15 | 217.56 |
| 20 | 290.08 |
| 50 | 725.19 |
| 100 | 1,450.38 |
| 200 | 2,900.75 |
| 232 | 3,364.88 |
| 300 | 4,351.13 |