Bar to PSI Converter
Converts bar to psi (bar to psi) and back. The conversion factor is shown below every result.
How to Convert Bar to PSI
What Is a Bar?
The bar is a metric unit of pressure defined as exactly 100,000 pascals.
What Is a PSI?
PSI (pounds per square inch) is a US customary unit of pressure equal to exactly 6,894.757293168 pascals.
Common Bar to PSI Reference Points
Real-world reference values for quick sanity checks.
| Item | Bar (bar) | PSI (approx.) |
|---|---|---|
| Typical car tire pressure | 2.2 bar | 31.91 psi |
| Road bike tire pressure (high) | 8 bar | 116.03 psi |
| Reference values are illustrative approximations for common items, not measured specifications. | ||
Bar to PSI Conversion Table
| Bar (bar) | PSI (psi) |
|---|---|
| 0.5 bar | 7.251887 psi |
| 1 bar | 14.503774 psi |
| 1.5 bar | 21.755661 psi |
| 2 bar | 29.007548 psi |
| 2.2 bar | 31.908302 psi |
| 3 bar | 43.511321 psi |
| 5 bar | 72.518869 psi |
| 8 bar | 116.03019 psi |
| 10 bar | 145.037738 psi |
| Source: NIST SP 811, Appendix B (1 bar = 100,000 Pa exactly; 1 psi = 6,894.757293168 Pa exactly) | |
Frequently Asked Questions
How do I convert bar to PSI?
Multiply the bar value by 14.5037737730. For example, 2.5 bar × 14.5037737730 = 36.259 psi.
Why is the factor 14.5037737730 and not a round number?
The bar is a clean metric definition (exactly 100,000 Pa), but PSI traces back to the pound-force and the square inch, two US customary units with their own exact but non-round definitions. The ratio between them doesn't land on a round number.
What bar reading should I use for my car tires?
Check your vehicle's door jamb sticker or owner's manual for the recommended PSI or bar figure; don't guess. Most passenger car tires run 2.0 to 2.5 bar (about 29 to 36 psi), but the correct number varies by vehicle and load.
Related Pressure Converters
A good measuring tool marked in both bar and psi removes the guesswork at the point of use.