How to convert bar to pounds per square inch
1 bar ≈ 14.5038 psi
1 bar = 100,000 Pa exactly (SI Brochure) and 1 psi ≈ 6,894.757 Pa (NIST SP 811), so 1 bar ≈ 14.50377 psi.
Examples
- 2.2 bar = 31.908302 psi: a tire pressure printed in bar
- 9 bar = 130.53396 psi: an espresso machine gauge reading
- 4 bar = 58.015095 psi: a garden sprayer gauge reading in bar
Bar to psi chart
| Bar (bar) | Pounds per square inch (psi) |
|---|---|
| 1 bar | 14.503774 psi |
| 2 bar | 29.007548 psi |
| 2.2 bar | 31.908302 psi |
| 3 bar | 43.511321 psi |
| 4 bar | 58.015095 psi |
| 5 bar | 72.518869 psi |
| 9 bar | 130.53396 psi |
| 10 bar | 145.03774 psi |
| 15 bar | 217.55661 psi |
| 20 bar | 290.07548 psi |
| 25 bar | 362.59434 psi |
| 50 bar | 725.18869 psi |
| 75 bar | 1,087.783 psi |
| 100 bar | 1,450.3774 psi |
Common mistakes
- Some gauges show kPa instead of bar. 1 bar is 100 kPa exactly, so 220 kPa is the same as 2.2 bar.
- The quick factor of 14.5 psi per bar is about 0.03% low; use 14.5038 when precision matters.