Millibars to Pascals Converter

The Millibars to Pascals Converter converts pressure from millibars (mbar) to Pascals (Pa). The conversion is straightforward: 1 mbar = 100 Pa (exact). Millibars are the traditional pressure unit in meteorology, while Pascals are the SI standard. This converter also shows that 1 mbar = 1 hectopascal (hPa) — they are numerically identical.

The millibar has been the standard pressure unit in meteorology since the early 20th century. Weather maps, aviation reports (METAR), and atmospheric research papers commonly express barometric pressure in millibars. Standard sea-level pressure is 1013.25 mbar. Tropical cyclone intensity is classified partly by central pressure in millibars — a Category 5 hurricane has a central pressure below 920 mbar.

In 1984, the World Meteorological Organization (WMO) adopted the hectopascal (hPa) as the preferred unit, since it is numerically identical to the millibar but uses the SI Pascal as its base. This means 1013.25 mbar = 1013.25 hPa — meteorologists can use either designation without changing any numbers. The transition was seamless, and both units remain in common use.

Beyond meteorology, millibars appear in vacuum science (especially in European laboratories), altimetry (where pressure altitude is calculated from millibar readings), and process engineering. Our converter provides both Pascal and hectopascal outputs. Since 1 mbar = 1 hPa by definition, the hectopascal output serves primarily to confirm this identity for users unfamiliar with the relationship.