The psi to bar formula
To convert psi to bar, multiply by 0.0689476: bar = psi × 0.0689476. For example, 100 psi × 0.0689476 = 6.89 bar. One bar equals 100,000 pascals. To reverse it, use the bar to psi calculator.
How to convert psi to bar
Enter a pressure in psi and the calculator multiplies by 0.0689476 to give bar. This is common for tyre pressures, scuba tanks, and hydraulics, where the US uses psi and Europe uses bar.
Typical values worth knowing: a car tyre at 32 psi is 2.21 bar, a European door-jamb sticker asking for 2.4 bar means 34.8 psi, a road bike tyre at 100 psi is 6.89 bar, and a full scuba cylinder at 200 bar is about 2,900 psi. For a rough head conversion, divide psi by 14.5.
Check units before trusting a gauge: many pumps show kPa as well, where 100 kPa is 1 bar, and some show kgf/cm², which is close to but not exactly 1 bar. Cold and hot readings differ too — tyre pressure rises roughly 0.1 bar for every 10 °C, so set pressures on cold tyres.
The same numbers feed straight into the kilowatts to horsepower calculator.
PSI to bar reference table
| PSI | Bar |
|---|---|
| 14.5 psi | 1.00 bar |
| 32 psi | 2.21 bar |
| 100 psi | 6.89 bar |
| 200 psi | 13.79 bar |
The factor comes from the definitions: 1 bar is exactly 100,000 pascals and 1 psi is 6,894.76 pascals, so 1 psi is 0.0689476 bar and 1 bar is 14.5038 psi. Standard atmospheric pressure at sea level is 1.01325 bar, or 14.696 psi, which is why one bar is described as roughly one atmosphere rather than exactly one.
Once that is settled, the celsius to fahrenheit calculator takes care of the next part.
Frequently asked questions
- What is 100 psi in bar?
- 100 psi equals 6.89 bar (100 × 0.0689476).
- What is the psi to bar formula?
- bar = psi × 0.0689476.
- How many psi is 1 bar?
- One bar equals about 14.5 psi.
- How do I convert bar back to psi?
- Multiply by 14.5038, or use the bar to psi calculator.
- Is tyre pressure measured in absolute or gauge pressure?
- Gauge pressure, which is why a flat tyre reads 0 psi even though the air around it is at about 14.7 psi absolute. The conversion factor is the same either way, but never add or subtract atmospheric pressure when converting a gauge reading.