Convert PSI to Bar
PSI to bar is the conversion you need when a pressure reading is in the everyday US unit — pounds per square inch, the number on a tire gauge or an air compressor — but the gauge or spec you're comparing against uses bar. One psi is approximately 0.0689475729316836 bar, so the bar figure comes out much smaller.
Pounds per square inch to Bar conversion table
| Pounds per square inch (psi) | Bar (bar) |
|---|---|
| 1 | 0.068948 |
| 2 | 0.137895 |
| 3 | 0.206843 |
| 5 | 0.344738 |
| 10 | 0.689476 |
| 20 | 1.378951 |
| 50 | 3.447379 |
| 100 | 6.894757 |
| 500 | 34.473786 |
| 1,000 | 68.947573 |
The formula
To convert psi to bar, multiply the pressure in psi by 0.0689475729316836:
bar = psi × 0.0689475729316836
A worked example
Say you have a car tire at 32 psi and want it in bar:
32 × 0.0689475729316836 = 2.2063223 bar
So a tire at 32 psi is about 2.2 bar.
Why it's an approximation
Psi (pounds per square inch) is a US imperial unit, built from the pound and the inch. The bar is defined from the pascal, a metric unit built from the newton and the meter. The two systems don't divide evenly, so converting between them lands on a long, non-terminating number — 0.0689475729316836 is that value rounded off. It's carried to enough decimals for any everyday job, but it stays an approximation rather than a clean, exact figure.
When you'll use it
Reading a US tire or compressor gauge in psi and needing bar to match a European tire sticker, a bike pump, or a dive or scuba gauge marked in bar.
Frequently asked questions
How many bar are in one psi?
About 0.0689475729316836 bar. It's a rounded figure — psi is an imperial unit that doesn't line up evenly with the bar, so this factor is carried to enough decimals to be practical but is not exact.
What is a typical car tire in bar?
A car tire at about 32 psi is roughly 2.2063223 bar — so people often just say a tire is around 2.2 bar. Bar is a common pressure unit on European tire gauges and bike pumps, which is why the comparison comes up so often.
Is the psi to bar conversion exact?
No. Psi is a US imperial unit, and its conversion to the metric-derived bar is a long, non-terminating number. The factor 0.0689475729316836 is rounded — more decimal places give more precision if you need it.