Pressure Converter: psi, bar, kPa, atm, mmHg, inHg
Convert psi, bar, pascals, kPa, MPa, atmospheres, mmHg, torr and inHg, with the factor shown.
Inputs
| Unit | 32 PSI is |
|---|---|
| Pascal | 220,632.224 |
| Kilopascal | 220.632224 |
| Bar | 2.206322 |
| Atmosphere | 2.177471 |
| PSI | 32 |
| mmHg | 1,654.87738 |
| Megapascal | 0.220632 |
| Torr | 1,654.87738 |
| inHg | 65.152652 |
- Factor
- 1 PSI = 6.894757 Kilopascal
- Working
- 32 × 6.894757 = 220.632224
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What each Pressure input means
- Value
- The pressure to convert: a tyre reading, a weather pressure, a blood-pressure figure, a gauge.
- From
- psi and inHg are US units; Pa, kPa, MPa and bar are metric, with 1 bar = 100 kPa; atm is standard atmospheric pressure; mmHg and torr are used for blood pressure and vacuum work.
- To
- The unit you want. A tyre gauge reads gauge pressure, above the atmosphere; convert it like any other pressure.
Pressure conversion formula
result = value × (pascals in one 'from' unit ÷ pascals in one 'to' unit)
Pressure is force per area, and the pascal — one newton per square metre — is the anchor. A bar is 100,000 Pa, and the standard atmosphere 101,325 Pa, so the two are close but not equal. Pounds per square inch (psi) is 6,894.757 Pa, so a bar is 14.504 psi. Medicine and weather still use the height of a mercury column: a millimetre of mercury (and its near-twin the torr) is 133.322 Pa, an inch of mercury 3,386.389 Pa. The page converts through pascals and lists every unit.
Pressure conversion worked example
32 psi × 6.894757 = 220.6 kPa, or 2.206 bar — the same tyre pressure written three ways. Standard atmospheric pressure, 101.325 kPa, is 14.696 psi, 760 mmHg and 29.92 inHg.
More Pressure examples
A European tyre placard of 2.2 bar: 2.2 × 14.503774 = 31.908304 psi — set the gauge to 32 psi.
A systolic blood pressure of 120 mmHg in kilopascals: 120 × 0.133322 = 15.998688 kPa, about 16 kPa.
One standard atmosphere, 101,325 Pa, is 14.695949 psi — the 14.7 psi of the air pressing on everything at sea level.
Where the Pressure converter can give the wrong answer
- Tyre gauges read gauge pressure, above the surrounding atmosphere; absolute pressure adds about 1 atm. This page converts units, not between gauge and absolute.
- mmHg and torr are equal to within a few parts per million and are treated as equal here.
- Blood pressure is in mmHg by convention; the numbers convert like any other pressure.
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Pressure conversion reference table
| psi | kPa | bar |
|---|---|---|
| 26 | 179.3 | 1.79 |
| 28 | 193.1 | 1.93 |
| 30 | 206.8 | 2.07 |
| 32 | 220.6 | 2.21 |
| 35 | 241.3 | 2.41 |
| 36 | 248.2 | 2.48 |
| 40 | 275.8 | 2.76 |
| 45 | 310.3 | 3.1 |
| 80 | 551.6 | 5.52 |
| 100 | 689.5 | 6.89 |
Pressure conversion FAQ
- 14.504. A bar is 100,000 Pa and a psi 6,894.757 Pa.
- 2.21 bar, or 220.6 kPa: 32 × 6,894.757 Pa = 220,632 Pa.
- 101,325 Pa: 1.01325 bar, 14.696 psi, 760 mmHg or 29.92 inHg.
- For all practical purposes. A torr is 1/760 of a standard atmosphere and a conventional mmHg 133.3224 Pa; they differ by less than one part in 6 million.
- 2.41 bar: 35 × 0.0689476. 30 psi is 2.07 bar and 40 psi 2.76 bar.
- psig is gauge pressure, measured above the surrounding air — what a tyre gauge reads. psia is absolute pressure, gauge plus about 14.7 psi at sea level. Plain 'psi' on a tyre means psig.
- 16.0/10.7 kPa: multiply each mmHg figure by 0.1333. Blood pressure is still reported in mmHg almost everywhere.
- 14.696 psi at sea level — 101,325 Pa — usually rounded to 14.7.
- 100. A bar is 100,000 Pa, so 2.5 bar is 250 kPa.
- 145.04 psi. Concrete and hydraulic pressures are often quoted in MPa: 30 MPa concrete is about 4,350 psi.
- US weather reports and aircraft altimeters give barometric pressure in inches of mercury; standard sea-level pressure is 29.92 inHg.
- 3.45 bar: 50 × 0.0689476.
- 0.145. Multiply kPa by 0.145 for psi, or divide psi by 0.145 for kPa.
- 36.3 psi: 2.5 × 14.5038.
- 14.5 psi — a little under one atmosphere.
- 133.32 Pa, the same as a millimetre of mercury to within a millionth.
- Air in a sealed tyre loses pressure as it cools, as the ideal gas law predicts. Check pressures cold, before driving, against the figure on the door-pillar placard.
- 1.01325 bar.