Convert pressure units — pascal, PSI, bar, atmosphere, torr, mmHg and more.
| Unit | Name | Value |
|---|---|---|
| 0.001 mmHg | 0.00133322 mbar | |
| 0.01 mmHg | 0.0133322 mbar | |
| 0.1 mmHg | 0.133322 mbar | |
| 1 mmHg | 1.33322 mbar | |
| 5 mmHg | 6.6661 mbar | |
| 10 mmHg | 13.3322 mbar | |
| 50 mmHg | 66.661 mbar | |
| 100 mmHg | 133.322 mbar | |
| 1000 mmHg | 1333.22 mbar |
Formula: Millibar = mmHg × 1.333
Multiply any mmhg value by 1.333 to get millibar.
Reverse: mmHg = Millibar × 0.7501
Common mmhg values — factor: 1 mmHg = 1.333 mbar
| mmHg (mmHg) | Millibar (mbar) | Context |
|---|---|---|
| 1 mmHg | 1.333 mbar | Very low / ophthalmic |
| 5 mmHg | 6.666 mbar | Low IOP |
| 10 mmHg | 13.33 mbar | Diastolic minimum |
| 20 mmHg | 26.66 mbar | Low BP diastolic |
| 40 mmHg | 53.33 mbar | Low BP range |
| 60 mmHg | 79.99 mbar | Hypotensive |
| 80 mmHg | 106.7 mbar | Normal diastolic |
| 100 mmHg | 133.3 mbar | Elevated diastolic |
| 120 mmHg | 160 mbar | Normal systolic |
| 200 mmHg | 266.6 mbar | High BP |
| 300 mmHg | 400 mbar | Hypertensive crisis |
| 760 mmHg | 1,013 mbar | 1 atm |
| 1,000 mmHg | 1,333 mbar | Above atm |
| 2,000 mmHg | 2,666 mbar | ~2.6 atm |
| 1e+04 mmHg | 1.333e+04 mbar | ~13 atm |
1 mmHg = 1.333 mbar. Memorize for instant estimates.
Use 1.333 as a quick mental multiplier.
Multiply result by 0.7501 to recover the original mmHg value.
Measures and interprets blood pressure in mmHg — the global clinical standard.
Measures intraocular pressure in mmHg to screen for and manage glaucoma.
Monitors arterial blood pressure and ventilator settings in mmHg.
Specifies rough vacuum ranges in torr/mmHg for laboratory systems.
Measures pulmonary artery pressure and oxygen partial pressure in mmHg.
Quantifies gas partial pressures (O₂, CO₂) in blood and tissues in mmHg.
Millimeters of mercury (mmHg) is the traditional medical pressure unit, defined as the pressure exerted by a 1 mm column of mercury at 0°C under standard gravity. It equals 133.322 Pa and is numerically identical to the torr.
Blood pressure is universally measured in mmHg worldwide: normal blood pressure is about 120/80 mmHg. Intraocular pressure (glaucoma screening) is measured in mmHg. Gas partial pressures in physiology are quoted in mmHg.
Interesting fact: The sphygmomanometer (blood pressure cuff) still uses mmHg more than 130 years after its invention, making mmHg one of the most clinically important pressure units despite not being an SI unit.
The millibar (mbar) equals 0.001 bar or 100 pascals, and is numerically identical to the hectopascal (hPa). It became the standard unit for surface pressure in international meteorology in the 20th century.
Weather maps and forecasts worldwide use millibars or hectopascals for surface pressure. Standard sea-level pressure is 1013.25 mbar. Hurricanes and typhoons are characterized by very low central pressures — Hurricane Patricia (2015) reached 872 mbar.
Interesting fact: A 1 mbar pressure difference over 111 km (1° latitude) drives a wind of approximately 1 m/s in mid-latitudes, which is why steep pressure gradients produce strong winds.
Converting mmhg to millibar is a common task in engineering, medicine, meteorology, and science. Different industries and countries use different pressure units — PSI in the US, bar in Europe, mmHg in medicine, and pascals in physics — making accurate conversion essential for cross-disciplinary work.
Quick reference: 5 mmHg = 6.666 mbar and 10 mmHg = 13.33 mbar. For the reverse: 1 mbar = 0.7501 mmHg. The exact factor is 1 mmHg = 1.333 mbar.
All conversions use IEEE 754 double-precision arithmetic, accurate to at least 8 significant figures.