Bar to mbar Converter

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Convert bar to millibars using the SI relation 1 bar = 1,000 mbar. Equivalent to converting bar to hPa (mbar = hPa exactly). Anchors: 1 bar = 1,000 mbar = 1,000 hPa, 1.01325 bar = 1,013.25 mbar (sea-level atm), 5 bar = 5,000 mbar (high-pressure dive). Useful when bar pressure values need to feed into meteorology software that expects hPa/mbar. Browser-local.

Bar
Millibar (mbar)

Bar → Millibar (mbar)

Quick reference table

BarMillibar (mbar)
1 bar1000 mbar
2 bar2000 mbar
5 bar5000 mbar
10 bar10000 mbar
25 bar25000 mbar
50 bar50000 mbar
100 bar100000 mbar

Glossary

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.

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.

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

mbar to Bar
Convert mbar to bar — 1000 mbar = 1 bar (mbar = hPa)
Bar to atm
Convert bar to atm — 1 bar ≈ 0.9869 atm
atm to mbar
Convert atm to mbar — 1 atm = 1013.25 mbar
Pressure Converter
Convert pressure — Pa, kPa, MPa, bar, mbar, atm, mmHg, psi