How pressure conversion works
Every pressure unit has a fixed ratio to the pascal. The value is first converted to pascals, then into the target unit.
Common values
| Value (bar) | Result |
|---|---|
| 0.1 bar | 1.45038 psi |
| 0.25 bar | 3.62594 psi |
| 0.5 bar | 7.25189 psi |
| 1 bar | 14.5038 psi |
| 1.5 bar | 21.7557 psi |
| 2 bar | 29.0075 psi |
| 3 bar | 43.5113 psi |
| 5 bar | 72.5189 psi |
| 10 bar | 145.038 psi |
More detail
Where each unit is used
psi (pounds per square inch) is common for US tire and industrial pressure; atm (standard atmosphere) is the reference used in chemistry and meteorology; mmHg (millimeters of mercury) is the scale on blood-pressure monitors and barometers. bar and kPa are common in SI-based engineering.
Tire pressure. 1 atm ≈ 101.325 kPa ≈ 14.7 psi ≈ 1.013 bar. Car tires are usually 30–35 psi, which is roughly 2.1–2.4 bar.
Frequently asked questions
How many psi is 1 bar?
1 bar ≈ 14.5038 psi. Enter your own value above for the exact conversion.
What is standard atmosphere (1 atm) in bar and psi?
1 atm is defined as exactly 1.01325 bar, which equals 14.696 psi.
What tire pressure should I use, psi or bar?
Passenger car tires typically run 30–35 psi (about 2.1–2.4 bar). Check the sticker inside your driver's door for the exact spec — this converter switches between the two instantly.
What is 120 mmHg in kPa or psi?
120 mmHg ≈ 16.0 kPa ≈ 0.16 bar ≈ 2.32 psi, using 1 mmHg = 133.322 Pa.