Convert pressure between pascals, kilopascals, bars, PSI, atmospheres and millimeters of mercury.
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1 atm is exactly 101.325 kPa, and 1 bar is about 0.98692327 atm. A tyre at 32 psi is about 220.63223338 kPa, while 2.2 bar is about 31.9083023 psi.
Every pressure converts through the pascal, one newton per square meter. A kilopascal is 1,000 Pa, a bar is exactly 100,000 Pa and a standard atmosphere is exactly 101,325 Pa. Millimeters of mercury use the conventional factor of 133.322387415 Pa.
These are unit conversions only. They do not adjust for altitude, nor do they say whether a reading is gauge pressure, measured above the surrounding air, or absolute pressure. Industrial gauges may be labelled psig or psia to make that distinction explicit.
All pressures convert through the pascal, one newton per square meter. A kilopascal is 1,000 Pa, a bar is exactly 100,000 Pa and a standard atmosphere is exactly 101,325 Pa, so 1 atm is 101.325 kPa and 1 bar is about 0.98692327 atm. Weather maps use hectopascals, where 1 hPa is 100 Pa and standard sea-level pressure is 1,013.25 hPa. A megapascal is common for hydraulics and materials: 1 MPa is about 145.03773773 psi.
Tyre placards list the same pressure in different units depending on the market. 32 psi is about 220.63223338 kPa, and 2.2 bar is about 31.9083023 psi, so a car door label reading 220 kPa, 2.2 bar or 32 psi describes practically the same setting. Tyre gauges show gauge pressure, the amount above the surrounding air, not absolute pressure. Check tyres cold, before driving, because pressure rises as they warm up, and follow the vehicle maker’s figure rather than the maximum printed on the tyre wall.
Blood pressure is still recorded in millimeters of mercury. A systolic reading of 120 mmHg is about 15.99868649 kPa, and some medical literature reports both units. The mmHg factor used here is 133.322387415 Pa, the conventional value; the closely related torr differs only in the far decimal places. Vacuum and laboratory gauges may use torr or millibar, and industrial gauges may be labelled psig or psia to show whether they read gauge or absolute pressure.
| Input | Result |
|---|---|
1 atm → kPa | 101.325 |
32 psi → kPa | 220.63223338 |
2.2 bar → psi | 31.9083023 |
1 bar → atm | 0.98692327 |
120 mmHg → kPa | 15.99868649 |
1 MPa → psi | 145.03773773 |
Whichever your door placard uses; they describe the same setting. A label reading 220 kPa, 2.2 bar or 32 psi is practically identical, since 32 psi is about 220.63223338 kPa. Check tyres cold, before driving, because pressure rises as they warm, and follow the vehicle maker’s figure rather than the maximum printed on the tyre wall.
A hectopascal is 100 Pa, and standard sea-level pressure is 1,013.25 hPa, which is the same as 1 atm or 101.325 kPa. The hectopascal replaced the millibar, and the two are numerically identical, which is why older charts and newer ones show the same numbers.
By convention: a systolic reading of 120 mmHg is about 15.99868649 kPa, and some medical literature prints both. This converter uses 133.322387415 Pa per mmHg; the closely related torr differs only in the far decimal places. Vacuum and laboratory gauges may use torr or millibar instead.