Convert PSI to bar for pressure and tire measurements.
Convert PSI to bar using the official US customary standard conversion factor of 1 PSI = 0.0689475729 bar.
Convert PSI to bar for pressure and tire measurements.
Convert PSI to bar using the official US customary standard conversion factor of 1 PSI = 0.0689475729 bar.
High precision critical for hydraulic systems, industrial equipment, and safety applications. Tire pressure can use 1-2 decimal places.
Common mistake: Confusing PSI with PSIA (absolute pressure) and PSIG (gauge pressure). PSIG = PSIA - 14.7 (atmospheric pressure). Also, using approximate 0.07 bar per PSI instead of the exact 0.06895 bar.
| Item | PSI | Bar |
|---|---|---|
| Atmospheric | 14.7 | 1.01 |
| Car tire | 30 | 2.07 |
| Bike tire | 80 | 5.52 |
| Water pressure | 60 | 4.14 |
| Industrial | 1000 | 68.95 |
PSI (Pounds per Square Inch) is a unit of pressure.
Standard atmospheric pressure is approximately 14.7 PSI.
The official US customary standard defines 1 PSI as exactly 0.0689475729 bar.
PSIG is gauge pressure (relative to atmospheric), while PSIA is absolute pressure (including atmospheric). PSIA = PSIG + 14.7.
Correct tire pressure ensures safety, fuel efficiency, and even tire wear.
30 PSI equals approximately 2.07 bar.
Last Updated: 2026 · Reviewed by the UnitFig editorial team