The bar to psi formula
To convert bar to psi, multiply by 14.5038: psi = bar × 14.5038. For example, 2 bar × 14.5038 = 29.01 psi. One bar equals 100,000 pascals. To reverse it, use the psi to bar calculator.
The factor comes straight from the definitions: 1 bar is exactly 100,000 pascals and 1 psi is 6,894.76 pascals, so 100,000 ÷ 6,894.76 = 14.5038. Rounding it to 14.5 is fine for tyre work — on a 3 bar reading the difference is only about 0.01 psi.
How to convert bar to psi
Enter a pressure in bar and the calculator multiplies by 14.5038 to give psi. Tyre and gauge pressures are often labelled in bar in Europe but in psi in the US, so this conversion is useful for cars, bikes, and pumps.
Watch the difference between gauge and absolute pressure. Tyre, pump and boiler gauges read gauge pressure, measured above the surrounding air, while weather and vacuum figures are usually absolute. Converting bar to psi never changes which of the two you have; it only changes the unit, so a 2 bar gauge reading becomes 29.01 psi gauge, often written psig.
Typical values help you sanity-check a result: a car tyre runs about 2.2–2.5 bar (32–36 psi), a road bike tyre 6–8 bar (87–116 psi), an espresso machine brews near 9 bar (130.5 psi), and standard atmospheric pressure at sea level is 1.013 bar (14.70 psi).
The same numbers feed straight into the kilowatts to horsepower calculator.
Bar to psi reference table
| Bar | PSI |
|---|---|
| 1 bar | 14.50 psi |
| 2 bar | 29.01 psi |
| 3 bar | 43.51 psi |
| 10 bar | 145.04 psi |
Values between the rows scale linearly, so half of 3 bar is half of 43.51 psi, or 21.76 psi for 1.5 bar. If you only remember one number, remember that 1 bar is roughly 14.5 psi and multiply from there.
Once that is settled, the celsius to fahrenheit calculator takes care of the next part.
Frequently asked questions
- What is 2 bar in psi?
- 2 bar equals 29.01 psi (2 × 14.5038).
- What is the bar to psi formula?
- psi = bar × 14.5038.
- How many psi is 1 bar?
- One bar equals about 14.50 psi.
- How do I convert psi back to bar?
- Multiply by 0.0689476, or use the psi to bar calculator.
- Should I use bar or psi for car tyres?
- Use whichever unit your tyre placard and your gauge show, because mixing them causes real mistakes: 2.2 bar is 31.9 psi, not 22 psi. European cars usually list bar, US gauges read psi, and many forecourt pumps display both.