Millimetres of mercury to bar
Multiply millimetres of mercury by 0.00133322 to get bar.
760 mmHg = 1.0133 bar
How to convert millimetres of mercury to bar
The bar is exactly 100 000 pascals (100 kPa), close to one atmosphere. The millimetre of mercury is the conventional millimetre of mercury, exactly 101325/760 pascals (about 133.322 Pa), equal to the torr.
Worked example — 760 mmHg: 760 × 0.00133322 = 1.0133 bar.
Millimetres of mercury to bar table
| Millimetres of mercury | Bar |
|---|---|
| 100 mmHg | 0.133322 bar |
| 250 mmHg | 0.333306 bar |
| 500 mmHg | 0.666612 bar |
| 750 mmHg | 0.999918 bar |
| 760 mmHg | 1.0133 bar |
| 1,000 mmHg | 1.3332 bar |
| 1,500 mmHg | 1.9998 bar |
| 2,000 mmHg | 2.6664 bar |
| 5,000 mmHg | 6.6661 bar |
Reverse and related
About millimetres of mercury and bar
Millimetre of mercury (mmHg)
1 mmHg = 0.00133322 barDefinition. The conventional millimetre of mercury, exactly 101325/760 pascals (about 133.322 Pa), equal to the torr
History and origin
The millimetre of mercury comes from mercury barometers, where pressure was read as the height of a mercury column. It is now fixed conventionally as one 760th of a standard atmosphere, essentially equal to the torr.
Current use
mmHg is the standard unit for blood pressure — a reading of 120/80 mmHg — and for measuring vacuums.
Source: NIST SP 811, App. B; ISO 80000-4. Exact SI values are definitional (bar = 10⁵ Pa, atm = 101 325 Pa) or derived from the pound (NIST HB 44) and standard gravity 9.80665 m/s² (psi)
Bar (bar)
1 bar = 750.0617 mmHgDefinition. Exactly 100 000 pascals (100 kPa), close to one atmosphere
History and origin
The bar was introduced in the early twentieth century by the meteorologist Vilhelm Bjerknes, defined as exactly 100 000 pascals, close to average sea-level air pressure. Its name comes from the Greek for weight.
Current use
The bar is common outside the United States for tyre pressure, diving and weather, where the closely related millibar is also used.
Source: NIST SP 811, App. B; ISO 80000-4. Exact SI values are definitional (bar = 10⁵ Pa, atm = 101 325 Pa) or derived from the pound (NIST HB 44) and standard gravity 9.80665 m/s² (psi)
Where people use this
Millimetres of mercury: blood pressure, vacuum measurement. Bar: tyre pressure outside the US, diving, weather. 750 mmHg is about 1 bar.
Every value is carried to full double precision; the display is rounded.
Both units are defined in NIST SP 811, App. B; ISO 80000-4. Exact SI values are definitional (bar = 10⁵ Pa, atm = 101 325 Pa) or derived from the pound (NIST HB 44) and standard gravity 9.80665 m/s² (psi).
Questions people ask
How many bar is 760 mmHg?
760 mmHg, which is one atmosphere, is about 1.013 bar.
How many mmHg in a bar?
One bar is about 750 mmHg.
How many bar is 1000 mmHg?
1000 mmHg is about 1.33 bar.