To convert psi to bar, divide by 14.5038. To go the other way, multiply bar by 14.5038. So a 32 psi tyre is 32 ÷ 14.5038 = about 2.2 bar. The pressure converter does it instantly and covers kPa, atmospheres and mmHg too.
That is the rule. Here are the equivalents that matter most, since tyres are where most people meet this.
Why the factor is 14.5038
One bar is exactly 100,000 pascals, and one psi (pound per square inch) is 6,894.76 pascals. Divide one by the other and a bar is about 14.5038 psi. Both are defined precisely, so the conversion is exact and only rounded for display. People often round to “1 bar ≈ 14.5 psi” for a quick estimate, which is close enough for checking a tyre.
How to convert psi to bar
psi to bar
Divide by 14.5038.
- 30 psi → 2.07 bar
- 32 psi → 2.21 bar
- 35 psi → 2.41 bar
bar to psi
Multiply by 14.5038.
- 2.0 bar → 29.0 psi
- 2.5 bar → 36.3 psi
The pressure converter handles both directions and the other units.
Tyre pressure equivalents worth knowing
Garage air pumps in different countries use different units, so a handful of equivalents save guesswork:
- 30 psi ≈ 2.07 bar
- 32 psi ≈ 2.2 bar
- 35 psi ≈ 2.4 bar
- 40 psi ≈ 2.76 bar
Your car’s recommended pressure is usually printed on a sticker inside the driver’s door, often in both psi and bar, but if it lists only one, the converter fills the gap. Some gauges also show kilopascals: 1 bar is 100 kPa, so 2.2 bar is 220 kPa.
Where else it comes up
Beyond tyres, pressure conversions matter for bike pumps, weather readings (often in hectopascals or millibars, where 1 millibar equals 1 hectopascal), diving, and engineering work. For any of these, the exact factor keeps you safe, since pressure is one place where guessing can have real consequences.
To convert other everyday units, browse the full set on the length converter and beyond.