Millibar (mbar)

The millibar (mbar) is one thousandth of a bar, exactly 100 pascals. It is numerically identical to the hectopascal (hPa) used in meteorology.

Symbol: mbar

Quantity: pressure, stress and differential pressure (force per unit area)

SI relation: 1 mbar = 100 Pa (exact)

Derivation: 1 mbar = 10⁻³ bar = 100 Pa = 1 hPa

Exact: yes, by definition

Typical uses

Weather maps and barometers (sea level ≈ 1013 mbar)
Domestic gas supply in Europe (natural gas 20 mbar, propane 37 mbar)
Low-vacuum and leak testing
Filter and fan differential pressure in Europe

Convert millibars to other units

1 mbar in other pressure units
Conversion	1 mbar equals	Reverse
millibar to pascal	100 Pa	pascal to millibar
millibar to kilopascal	0.1 kPa	kilopascal to millibar
millibar to psi	0.01450377377 psi	psi to millibar
millibar to bar	0.001 bar	bar to millibar
millibar to millimeter of mercury	0.7500615758 mmHg	millimeter of mercury to millibar
millibar to inch of water	0.401463076 inH₂O	inch of water to millibar
millibar to atmosphere	0.0009869232667 atm	atmosphere to millibar
millibar to megapascal	0.0001 MPa	megapascal to millibar
millibar to torr	0.7500616827 Torr	torr to millibar
millibar to millimeter of water	10.19716213 mmH₂O	millimeter of water to millibar
millibar to centimeter of water	1.019716213 cmH₂O	centimeter of water to millibar
millibar to inch of mercury	0.0295299833 inHg	inch of mercury to millibar
millibar to decibar	0.01 dbar	decibar to millibar
millibar to inch of water (60 °F)	0.401864652 inH₂O (60 °F)	inch of water (60 °F) to millibar
millibar to barye	1000 Ba	barye to millibar

Open the Pressure Converter to convert any value between all units.

Sources

Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "millibar".

Last reviewed: 2026-10-15. Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.

Cite this page

APA

Scientific Converters. (2026, October 15). Millibar (mbar). Retrieved October 17, 2026, from https://scientificconverters.com/units/millibar/

IEEE

Scientific Converters, "Millibar (mbar)," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/units/millibar/