Millimeters of Mercury to Millibars Converter

To convert a measurement in millimeters of mercury to millibars, multiply the value by 1.333224. The conversion factor comes from the relationship between both units and the pascal.

For example, to convert 5 mmHg to millibars: 5 × 1.333224 = 6.666119 mbar.

A millimeter of mercury (mmHg) is a unit of pressure equal to the pressure exerted by a one-millimeter-high column of mercury, about 133.32 pascals. Derived from early mercury barometers, the mmHg is nearly identical to the torr. It remains the standard unit for blood pressure and other physiological measurements in medicine worldwide.

Common uses of millimeters of mercury include: Blood pressure readings (systolic/diastolic); Intraocular and intracranial pressure; Barometric pressure in medicine; Vacuum and gas-pressure measurement.

A millibar equals one thousandth of a bar, or 100 pascals, and is equivalent to the hectopascal used in modern meteorology. The millibar dominated weather reporting for much of the 20th century. It is numerically identical to the hectopascal (hPa) that officially replaced it, so 1013 mbar and 1013 hPa describe the same sea-level pressure.

Common uses of millibars include: Atmospheric pressure in weather forecasts; Barometer and altimeter readings; Aviation weather reporting; Storm and hurricane intensity tracking.

Here are some common values converted:

1 mmHg = 1.333224 mbar 5 mmHg = 6.666119 mbar 10 mmHg = 13.332239 mbar 50 mmHg = 66.661194 mbar 100 mmHg = 133.322387 mbar