Pressure Converter
Convert between PSI, bar, atm, pascal, and mmHg.
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1 psi = 0.0689476 bar
| PSI (psi) | Bar (bar) |
|---|---|
| 1 | 0.0689476 |
| 2 | 0.1378952 |
| 5 | 0.344738 |
| 10 | 0.689476 |
| 15 | 1.034214 |
| 20 | 1.378952 |
| 25 | 1.72369 |
| 50 | 3.44738 |
| 75 | 5.17107 |
| 100 | 6.89476 |
| 150 | 10.34214 |
| 200 | 13.78952 |
| 250 | 17.2369 |
| 500 | 34.4738 |
| 1,000 | 68.9476 |
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Pressure Unit Reference
| From | To |
|---|---|
| 1 atmosphere (atm) | 101.325 kPa / 14.696 psi / 760 mmHg / 1.01325 bar |
| 1 bar | 100 kPa / 14.504 psi |
| 1 psi | 6.895 kPa / 0.06895 bar |
| 1 kPa | 0.145 psi / 0.01 bar |
Where Each Pressure Unit Is Used
Tire pressure: PSI in the US, bar in Europe and most other countries. A typical car tire runs at 32–35 psi (2.2–2.4 bar).
Weather: Barometric pressure is measured in millibars (mb) or hectopascals (hPa) — these are numerically identical. Standard atmospheric pressure is 1,013.25 mb.
Medical: Blood pressure is measured in mmHg (millimeters of mercury). Normal is around 120/80 mmHg.
Industrial: Systems use kPa, bar, or PSI depending on the region and industry standards.
When to use this
You are checking your tire pressure and the owner's manual says 2.3 bar but your tire gauge reads in PSI. Or you are reading a weather report that lists atmospheric pressure in millibars while your barometer shows inches of mercury. Or you are working on a plumbing or HVAC specification that mixes pascals, PSI, and atmospheres. Pressure conversion is essential in automotive maintenance, meteorology, engineering, medicine, and diving.
The most commonly searched pressure conversions are PSI to bar, bar to PSI, atm to PSI, and kPa to PSI. The pascal (Pa) is the SI unit of pressure, but it is so small (1 Pa = the pressure of a dollar bill resting on a table) that kilopascals (kPa) and bar are used for practical measurements. This converter handles pascals, kilopascals, bar, PSI, atmospheres, and mmHg (torr).
Good to know
1 bar is roughly 1 atmosphere. Specifically, 1 atm = 1.01325 bar. They are close enough that in casual conversation they are interchangeable, but in engineering calculations the 1.3% difference matters. Standard atmospheric pressure at sea level is 101.325 kPa = 1.01325 bar = 14.696 PSI.
Tire pressure uses PSI in the US and bar/kPa everywhere else. A typical car tire pressure of 32 PSI equals about 2.2 bar or 220 kPa. Knowing that 1 PSI is about 0.069 bar (or roughly 1 bar = 14.5 PSI) is the most useful conversion for everyday automotive use.
Blood pressure uses mmHg worldwide. A reading of "120/80" means 120 millimeters of mercury systolic over 80 mmHg diastolic. This unit persists in medicine even though mercury manometers have largely been replaced by digital devices. 120 mmHg equals about 2.32 PSI or 16 kPa.
Quick Reference
| From | To | Multiply By |
|---|---|---|
| 1 PSI | Bar | 0.06895 |
| 1 PSI | kPa | 6.895 |
| 1 PSI | mmHg | 51.715 |
| 1 Bar | PSI | 14.504 |
| 1 Bar | kPa | 100 |
| 1 ATM | PSI | 14.696 |
| 1 ATM | Bar | 1.01325 |
| 1 ATM | mmHg | 760 |
| 1 kPa | PSI | 0.1450 |
| 1 mmHg | kPa | 0.1333 |