mbar to Bar Converter

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Convert millibars to bar using the SI relation 1 bar = 1,000 mbar. Note: mbar and hPa are identical units, so this converter also handles hPa → bar with the same factor. Anchors: 1,000 mbar = 1 bar (close to atmospheric), 1,013.25 mbar = 1.01325 bar = 1 atm. Useful when meteorological mbar/hPa readings need to be expressed in bar. Browser-local.

Millibar (mbar)
Bar

Millibar (mbar) → Bar

Quick reference table

Millibar (mbar)Bar
1 mbar0.001 bar
2 mbar0.002 bar
5 mbar0.005 bar
10 mbar0.01 bar
25 mbar0.025 bar
50 mbar0.05 bar
100 mbar0.1 bar

Glossary

Millibar (mbar)

A millibar equals one thousandth of a bar, or 100 Pa. It is identical to the hectopascal (hPa) — meteorologists and weather services use both names interchangeably. Standard atmospheric pressure is 1013.25 mbar (= 1013.25 hPa). Surface weather charts, barometers and aircraft altimeters report station pressure in mbar/hPa.

Bar

The bar is a non-SI metric pressure unit equal to exactly 100,000 Pa, very close to atmospheric pressure at sea level (1 atm = 1.01325 bar). Widely used in European engineering, automotive specs (turbo boost, fuel-rail pressure), tire pressure (2–3 bar typical), scuba diving and weather charts. Not part of SI but accepted for use with SI.

Metric / SI pressure

In the metric system, pressure is reported in pascals (SI base) or its multiples — kilopascal (kPa, 10³ Pa), megapascal (MPa, 10⁶ Pa) — and the related non-SI unit bar (10⁵ Pa). The millibar/hectopascal (mbar = hPa = 100 Pa) is used in meteorology. All metric units relate by exact powers of ten, so conversions between them are simple shifts of decimal point.

Imperial / US pressure

US engineering and automotive primarily report pressure in pounds per square inch (psi). 1 psi ≈ 6,894.76 Pa, defined as one pound-force per square inch. Standard atmospheric pressure is 14.696 psi. The closely related "psi-gauge" (psi-g) measures pressure above atmospheric, while "psi-absolute" (psi-a) measures total pressure including atmospheric.

Related tools

Bar to mbar
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