Convert pressure between metric and imperial units including pascals, kilopascals, megapascals, bar, psi, atmospheres, torr, and millimeters of mercury.
Enter a value to convert.
| Unit | Equals |
|---|---|
| 1 Bar | 100,000 Pascals |
| 1 Kilopascal | 1,000 Pascals |
| 1 Megapascal | 1,000,000 Pascals |
| 1 Atmosphere | 101,325 Pascals |
| 1 psi | 6,894.757293168 Pascals |
| 1 Atmosphere | 760 Torr |
| 1 Torr | 133.3223684211 Pascals |
| 1 mmHg | 133.322387415 Pascals |
A pressure converter changes a measurement of force per unit area from one unit to another while representing the same physical pressure — 1 bar and about 14.5 psi describe the same pressure, just counted in different units. Pressure is used constantly in engineering, weather reporting, automotive maintenance, and science, and different fields default to different units, so converting between them is a routine task.
Metric pressure units are built from the pascal, the SI unit of pressure:
Defined as one newton of force per square meter. It is a very small unit — normal room air pressure is about 101,325 Pa.
1,000 pascals. Commonly used for tire pressure specifications and weather reporting outside North America.
1,000,000 pascals. Used for higher pressures such as hydraulic systems and material strength ratings.
A metric unit close to, but not exactly, one atmosphere. 1 bar = 100,000 pascals exactly. Widely used in Europe for tire pressure and industrial pressure gauges.
The standard pressure unit in the US, used for tire pressure, plumbing, and mechanical specifications. 1 psi = 6.894757293168 kPa.
Defined as standard atmospheric pressure at sea level: 1 atm = 101,325 pascals exactly. Used as a reference point in chemistry and physics.
Both units trace back to mercury barometers, and both are commonly used for vacuum measurements and blood pressure readings. But they are defined differently:
The difference between the two is less than 0.001%, so in practice they are treated as interchangeable — but they are not mathematically identical.
Pressure conversions come up when checking or adjusting tire pressure against a spec listed in a different unit, reading weather and barometric pressure reports that use hPa, kPa, or inHg, working through engineering and hydraulic system calculations, planning scuba diving depths and tank pressures, understanding blood pressure readings in a medical context, and adjusting cooking times and temperatures for altitude, where atmospheric pressure affects boiling points.
One bar equals approximately 14.5038 psi. To convert bar to psi, multiply the number of bar by 14.5037737730.
Standard atmospheric pressure (1 atm) is 101.325 kPa, or 101,325 pascals.
Multiply the number of psi by 6.894757293168 to get kilopascals. For example, 30 psi × 6.894757293168 ≈ 206.84 kPa.
Nearly, but not exactly. A torr is defined as exactly 1/760 of a standard atmosphere, while a millimeter of mercury (mmHg) is defined from the density of mercury and standard gravity. The two differ by less than 0.001%, close enough that they are used interchangeably in most contexts.
One bar equals exactly 100,000 pascals (100 kilopascals).
A pascal (Pa) is the SI unit of pressure, defined as one newton of force per square meter. It is a very small unit, so pressure is often expressed in kilopascals (kPa) or megapascals (MPa) instead.
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