Bar to PSI Converter
A complete pressure unit conversion tool for tire pressure and engineering. Enter a value in any field to instantly convert between **Bar**, **PSI**, **Kilopascals (kPa)**, and **Atmospheres (atm)**.
How to Convert Bar to PSI
Converting from bar to Pounds per Square Inch (PSI) is the most common pressure conversion for drivers, as European and US tire pressure gauges use different units. The conversion is straightforward.
The Conversion Formula
The relationship between bar and PSI is based on their definitions in Pascals:
1 PSI = 6,894.757 Pascals (Pa)
From this, we get the direct conversion factor:
- Bar to PSI:
PSI = bar × 14.50377 - PSI to Bar:
bar = PSI / 14.50377(or PSI × 0.0689476)
For a quick mental estimate, you can just remember 1 bar ≈ 14.5 psi.
Bar vs. atm: What's the Difference?
A common point of confusion is the difference between `bar` and `atm` (standard atmosphere). They are very close but **not the same**.
- 1 bar is defined as exactly **100,000 Pascals (Pa)**.
- 1 atm is defined as exactly **101,325 Pascals (Pa)**.
Therefore, 1 atmosphere is slightly larger than 1 bar (1 atm = 1.01325 bar). Our calculator includes both for scientific accuracy.
Common Tire Pressure Conversion Chart
A quick reference chart for common car tire pressures.
| Bar | PSI (approx.) | kPa (approx.) |
|---|---|---|
| 2.0 bar | 29.0 psi | 200 kPa |
| 2.1 bar | 30.5 psi | 210 kPa |
| 2.2 bar | 31.9 psi | 220 kPa |
| 2.3 bar | 33.4 psi | 230 kPa |
| 2.4 bar | 34.8 psi | 240 kPa |
| 2.5 bar | 36.3 psi | 250 kPa |
Frequently Asked Questions (FAQ)
What is the formula for bar to PSI?
The formula is: PSI = bar × 14.50377.
How many PSI are in 1 bar?
There are **14.50377 PSI** in 1 bar. For quick mental math, you can approximate 1 bar ≈ 14.5 PSI.
How many PSI in 2.2 bar?
To convert 2.2 bar to PSI (a common tire pressure), you multiply 2.2 by 14.50377, which equals **31.908 PSI** (often rounded to 32 PSI).