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Convert between PSI, bar, atm, kPa, and more with quick reference tables.
Pressure is force applied per unit area, measured in pascals (Pa). Common units include PSI, bar, atmospheres, and millimeters of mercury (mmHg). Standard atmospheric pressure at sea level is 101.325 kPa.
| Description | psi | bar | kPa |
|---|---|---|---|
| Car tire (typical) | 32 | 2.21 | 221 |
| Bike tire (road) | 100 | 6.89 | 689 |
| 1 atmosphere | 14.7 | 1.01 | 101.3 |
| Scuba tank | 3,000 | 207 | 20,684 |
| Water pressure (home) | 50 | 3.45 | 345 |
| Fire extinguisher | 195 | 13.4 | 1,344 |
Divide by 14.5038 or multiply by 0.0689476 to convert PSI to bar.
bar = psi × 0.0689476
Multiply by 100 to convert bar to kilopascals (1 bar = 100 kPa).
kPa = bar × 100
1 atm = 101.325 kPa = 1.01325 bar = 14.696 psi = 760 mmHg.
Formula
1 atm = 101.325 kPa = 1.01325 bar = 14.696 psi = 760 mmHgPa (pascal) = SI unit of pressure — 1 Pa = 1 N/m² (force per unit area)
psi = pounds per square inch — US/UK standard for tire pressure, hydraulics
bar = 100,000 Pa — used in industry; 1 bar ≈ 1 atm (within 1.3%)
mmHg = millimeters of mercury — medical standard for blood pressure (BP)
Worked Example
Convert 32 psi (car tire) to bar and kPa
Did you know? Normal blood pressure of 120/80 mmHg translates to just 0.159/0.106 atm — the human cardiovascular system operates at pressures barely above ambient. Car tires at 32 psi are more than twice the pressure of the atmosphere.
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