mmHg to mbar — convert millimetres of mercury to millibars
Exact 1 × 1.333224 = 1.333224
1 millimetre of mercury in other units
| Pascals | 133.322387 | Pa |
|---|---|---|
| Hectopascals | 1.333224 | hPa |
| Kilopascals | 0.13332239 | kPa |
| Megapascals | 0.000133322387 | MPa |
| Millibars | 1.333224 | mbar |
| Bar | 0.001333223874 | bar |
| Standard atmospheres | 0.001315789661 | atm |
| Pounds per square inch | 0.01933678 | psi |
| Torr | 1 | Torr |
| Inches of mercury | 0.03937008 | inHg |
mmHg to mbar at a glance
| Millimetres of mercury | Millibars |
|---|---|
| 1 mmHg | 1.333224 mbar |
| 2 mmHg | 2.666448 mbar |
| 3 mmHg | 3.999672 mbar |
| 5 mmHg | 6.666119 mbar |
| 10 mmHg | 13.332239 mbar |
| 20 mmHg | 26.664477 mbar |
| 25 mmHg | 33.330597 mbar |
| 50 mmHg | 66.661194 mbar |
| 100 mmHg | 133.322387 mbar |
| 250 mmHg | 333.305969 mbar |
| 500 mmHg | 666.611937 mbar |
| 1,000 mmHg | 1,333.22 mbar |
How to convert millimetres of mercury to millibars
Multiply by 1.333224 — one millimetre of mercury is 1.333224 millibars. That factor is exact: it comes from the definition of the units rather than from a measurement, so it will not change and does not need rounding.
Working 1 × 1.333224 = 1.333224
In words: about one millibars.
Questions
How many millibars are in a millimetre of mercury?
One millimetre of mercury is 1.333224 millibars. This figure is exact — it comes from the definition of the unit, not a measurement.
What is 1 millimetre of mercury in millibars?
1 millimetre of mercury is 1.333224 millibars. The working is 1 × 1.333224 = 1.333224.
What pressure should my tyres be?
Look at the sticker in the driver's door frame or the fuel flap, not the number moulded into the tyre — that one is the tyre's maximum, not the manufacturer's recommendation. Most cars sit somewhere around 32 to 35 psi, which is roughly 2.2 to 2.4 bar.
Is my tyre gauge measuring absolute or gauge pressure?
Gauge pressure — the amount above the surrounding air. A tyre reading 32 psi actually contains about 46.7 psi absolute, because atmospheric pressure of roughly 14.7 psi is already pressing on the other side of the gauge. Conversions on this page are between units, and leave that distinction alone.
Why do weather forecasts use hectopascals and millibars interchangeably?
Because they are the same size. One hectopascal is exactly one millibar, so the change from mbar to hPa was a relabelling rather than a conversion. Standard sea-level pressure is 1013.25 of either.
What is the difference between torr and mmHg?
Almost nothing, and the difference is deliberate. A torr is exactly one seven-hundred-and-sixtieth of a standard atmosphere; the conventional mmHg is defined as exactly 133.322387415 pascals. They diverge by about one part in seven million — invisible in medicine, occasionally not in vacuum work.