Millibars to Bars Converter

To convert a measurement in millibars to bars, multiply the value by 0.001. The conversion factor comes from the relationship between both units and the pascal.

For example, to convert 5 mbar to bars: 5 × 0.001 = 0.005 bar.

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.

A bar is a metric unit of pressure equal to exactly 100,000 pascals, roughly equal to atmospheric pressure at sea level. Introduced by Norwegian meteorologist Vilhelm Bjerknes, the bar takes its name from the Greek 'baros' (weight). Although not an SI unit, it remains popular in industry, diving, and weather because it is close to one atmosphere.

Common uses of bars include: Scuba diving depth and tank pressure; Industrial hydraulics and pneumatics; European tire and automotive pressure; Weather systems (via millibars).

Here are some common values converted:

1 mbar = 0.001 bar 5 mbar = 0.005 bar 10 mbar = 0.01 bar 50 mbar = 0.05 bar 100 mbar = 0.1 bar