Convert Millibars to Millimeters of Mercury
Convert Millibars (mbar) to Millimeters of Mercury (mmHg) instantly and accurately.
Conversion Formula
mmHg = mbar × 0.7500615758
About Millibars
A millibar (mbar) = 100 Pa = 1 hPa - the historically dominant meteorological pressure unit. Standard sea-level pressure is 1013.25 mbar. Hurricane intensity is characterised by central pressure: Category 5 storms typically below 920 mbar (US record: 892 mbar, 1935). Upper-air analysis levels - 850, 700, 500, 300, 200 mbar - appear throughout decades of archived meteorological data. Aircraft cabins are pressurised to ~750-800 mbar at cruise altitude. 'Weather bombs' see pressure fall 24+ mbar in 24 hours. 1 mbar = 100 Pa.
About Millimeters of Mercury
One millimetre of mercury (mmHg) = pressure from 1 mm of mercury at 0°C and standard gravity = 133.322 Pa. Clinical medicine worldwide uses mmHg for blood pressure (normal ~120/80 mmHg) and for gas partial pressures in physiology: arterial O₂ ~95-100 mmHg; CO₂ ~40 mmHg; alveolar O₂ ~104 mmHg. Ophthalmologists measure intraocular pressure in mmHg (normal 10-21; glaucoma risk above 21). Vacuum equipment ratings are also given in mmHg. 760 mmHg = 1 atm. 1 mmHg = 133.322 Pa.
Quick Reference Table
| Millibars (mbar) | Millimeters of Mercury (mmHg) |
|---|---|
| 1 mbar | 0.750062 mmHg |
| 2 mbar | 1.50012 mmHg |
| 5 mbar | 3.75031 mmHg |
| 10 mbar | 7.50062 mmHg |
| 25 mbar | 18.7515 mmHg |
| 50 mbar | 37.5031 mmHg |
| 100 mbar | 75.0062 mmHg |