Convert millimeters of mercury to bar
Millimeter of mercury (mmHg) to bar (bar). One millimeter of mercury equals 0.001333 bar.
Formula
Millimeter of mercury to bar conversion table
| Millimeters of mercury | Bar | Bar | Millimeters of mercury |
|---|---|---|---|
| 1 mmHg | 0.001333 bar | 1 bar | 750.06 mmHg |
| 2 mmHg | 0.002666 bar | 2 bar | 1500.12 mmHg |
| 3 mmHg | 0.004 bar | 3 bar | 2250.18 mmHg |
| 5 mmHg | 0.006666 bar | 5 bar | 3750.31 mmHg |
| 10 mmHg | 0.013332 bar | 10 bar | 7500.62 mmHg |
| 20 mmHg | 0.026664 bar | 20 bar | 15001.23 mmHg |
| 50 mmHg | 0.066661 bar | 50 bar | 37503.08 mmHg |
| 100 mmHg | 0.133322 bar | 100 bar | 75006.16 mmHg |
| 500 mmHg | 0.666612 bar | 500 bar | 375030.79 mmHg |
| 1000 mmHg | 1.3332 bar | 1000 bar | 750061.58 mmHg |
To convert millimeters of mercury to bar, divide the number of millimeters of mercury by 750.06. One millimeter of mercury equals 0.001333 bar, and one bar equals 750.06 millimeters of mercury, so the relationship is fixed and exact. As a worked example, 10 mmHg comes to 0.013332 bar. Enter your own figure in the converter above to get an instant answer, or use the swap button to flip the direction. This is a pressure conversion, and like every tool on UnitGlide it runs locally in your browser with no account or upload required. The table further down shows a range of common millimeter of mercury values already worked out in bar, plus the reverse bar to millimeter of mercury direction, which is handy for quick reference or double-checking a result by hand.
Millimeter of mercury to bar in practice
Millimetres of mercury to bar links the pressure unit of medicine and vacuum work to the bar used for weather and industrial gauges.
Blood pressure, vacuum and weather
Blood pressure is read in mmHg, so a 120 mmHg systolic is 0.16 bar, and laboratory vacuum gauges quoted in mmHg convert the same way. Atmospheric pressure sits near 760 mmHg, which is 1.013 bar, the reason standard sea-level pressure and a round one bar are so close but never quite identical.
mmHg, Torr and millibar
One millimetre of mercury is almost exactly one Torr, so the two are used interchangeably in vacuum work without anyone converting between them. Weather, though, tends to use hectopascals or millibars, and a millibar is a thousandth of a bar, so it is worth checking which unit a gauge or forecast is printed in before starting.
A mental anchor for the decimal
One mmHg is about 0.00133 bar, an awkward small number where it is easy to lose a decimal place. A quick check keeps you honest: 750 mmHg is very nearly one bar, so any everyday pressure in mmHg divided by 750 lands close to its value in bar, and 375 mmHg is roughly half a bar.
Why mercury at all
The unit is a hangover from the mercury barometer and sphygmomanometer, where pressure literally pushed a column of mercury up a tube and its height in millimetres was the reading. Medicine kept the unit long after the instruments changed, which is why a modern digital monitor still shows a figure in mmHg rather than bar or pascals.
Tyres, diving and other gauges
Many working gauges skip mmHg entirely and read in bar: a car tyre sits around 2.2 bar, and a scuba cylinder at 200 bar towers over anything in the mmHg range. Converting a medical or vacuum figure into bar is often about placing it on that familiar scale, where 120 mmHg turning into a mere 0.16 bar makes plain just how gentle blood pressure is beside an industrial line.
Frequently asked questions
How many bar are in a millimeter of mercury?
One millimeter of mercury equals 0.001333 bar. The ratio is constant, so you can multiply any number of millimeters of mercury by 0.001333 to get bar.
What is the formula to convert millimeters of mercury to bar?
Use bar = millimeters of mercury ÷ 750.06. UnitGlide applies this exact formula for every value, so results stay accurate across the whole range.
How do I convert bar back to millimeters of mercury?
Go the other way by using one bar equals 750.06 millimeters of mercury. You can also press the swap button in the converter above to flip the direction in one click.
Is this millimeter of mercury to bar converter accurate?
Yes. It uses internationally defined SI conversion factors, as maintained by the BIPM, and all math runs in your browser so nothing is rounded away on a server. For everyday use the displayed precision is more than enough.