How to Convert PSI to Bar (and Back)
PSI (pounds per square inch) and bar are the two most common pressure units for everyday use — mainly for tire inflation, but also for cooking (pressure cookers), weather, and industrial applications. This guide explains both units, gives you the conversion formula, and provides a practical tire pressure reference.
What Is PSI?
PSI stands for pounds per square inch. It measures how many pounds of force are applied per square inch of area. It is the standard pressure unit in the United States and is used for tire pressure, blood pressure (alongside mmHg), air compressors, and hydraulics.
1 PSI = 6,894.757 pascals (the SI unit of pressure).
What Is Bar?
Bar is a metric pressure unit equal to exactly 100,000 pascals (100 kPa). It is slightly less than standard atmospheric pressure (1 atm = 1.01325 bar). Bar is the standard tire pressure unit in Europe and most of the world outside the US.
Tire pressure gauges in Europe show bar. Weather pressure maps use hectopascals (hPa), which equal millibar — 1,013 hPa = 1.013 bar at sea level.
The Conversion Formula
1 bar = 14.5038 PSI. To convert bar to PSI, multiply by 14.5038.
1 PSI = 0.0689476 bar. To convert PSI to bar, multiply by 0.0689476.
Mental shortcut: 1 bar ≈ 14.5 PSI. For a quick estimate, multiply bar by 14.5 or divide PSI by 14.5.
Tire Pressure Reference
Recommended tire pressure varies by vehicle — always check the sticker inside your driver door. Common ranges:
- 2.0 bar = 29 PSI (low end for passenger cars)
- 2.2 bar = 32 PSI (common for compact cars)
- 2.4 bar = 35 PSI (common for sedans and SUVs)
- 2.5 bar = 36 PSI (higher end for passenger cars)
- 4.5–6.0 bar = 65–87 PSI (road bicycle tires)
- 1.5–2.5 bar = 22–36 PSI (mountain bike tires)
Other Pressure Reference Points
Atmospheric pressure at sea level: 1.01325 bar = 14.696 PSI.
Pressure cooker: typically 0.8–1.0 bar (11.6–14.5 PSI) above atmospheric pressure.
Scuba tank: 200–300 bar (2,900–4,350 PSI).
Blood pressure (systolic, healthy adult): about 120 mmHg = 0.16 bar = 2.32 PSI.
Conclusion
1 bar = 14.5038 PSI. 1 PSI = 0.0689476 bar. For tire pressure: most cars use 2.0–2.5 bar (29–36 PSI). Always check your vehicle's recommended pressure on the door sticker — overinflation and underinflation both reduce safety and fuel efficiency. Use our free pressure converter for instant results.