mbar – Millibar Pressure Unit

Millibar is a metric unit of pressure mainly used in European countries and is derived directly from the bar pressure unit which equals 1,000 mbar. In SI units 1 mbar equals 100 pascals.

The millibar is most commonly used to measure barometric pressure for meteorological purposes and low range gas pressures due to its very small value.

In recent years the mb pressure unit has been replaced by the hPa (hectopascal) which is exactly the same value. However the millibar has been used by many people for many years so it will be a long time before its use is completely phased out if at all.

There are three common abbreviated forms used to identify millibar pressure unit which are mb, mbar and mbr.

You can convert a millibar reading into a different pressure unit by multiplying it by one of the conversion factors in the table below.

Alternatively you can use our pressure converter to calculate the answer instead.

• 150 mbar combined differential pressure sensor, gauge and logger
• Low cost barometric pressure transmitter for 750 – 1250 mbar absolute
• 500 to 1200 millibar atmospheric pressure logger with RS232 interface
• 400 mbar absolute (not relative) battery supplied vacuum sensing display

Conversion Factors

• 0.001 bar
• 0.0145038 psi
• 1 mbar
• 100 N/m²
• 100 Pa
• 1 hPa
• 0.1 kPa
• 0.0001 MPa
• 0.00101972 kg/cm²
• 10.1972 mmH2O 4°C (39.2°F)
• 1.01972 cmH2O 4°C (39.2°F)
• 0.0101972 mH2O 4°C (39.2°F)
• 0.401463 inH2O 4°C (39.2°F)
• 0.0334553 ftH2O 4°C (39.2°F)
• 0.750062 mmHg 0°C (32°F)
• 0.0750062 cmHg 0°C (32°F)
• 0.0295300 inHg 0°C (32°F)
• 0.750062 Torr
• 750.062 mTorr
• 0.000986923 atm
• 0.00101972 at
• 1000 dyn/cm²
• 0.232060 oz/in²
• 750.062 µHg 0°C (32°F)
• 0.00000647490 tsi (uk, long)
• 0.00000725189 tsi (usa, short)
• 0.00104427 tsf (usa, short)
• 2.08854 psf
• 1.01972 g/cm²

Please note that the conversion factors above are accurate to 6 significant figures.

• 20 mbarg digital display air pressure indicator and transmitter with 1/4 NPT male fitting
• Minus 15 mbar (6 inH2O) range suction pressure transmitter
• +/-100 millibar digital manometer recorder with ATEX approval
• Swimming pool submersible pressure transmitter with 300 mbar range

Conversion Tables

Select a look up table for converting a pressure reading in millibars to other measurement units.

• bar  »  1 to 2,000 mbar → 0.001 to 2.000 kPa
• psi  »  1 to 2,000 mbar → 0.0145038 to 29.0075 psi
• Pa  »  1 to 2,000 mbar → 100 to 200,000 Pa
• kPa  »  1 to 2,000 mbar → 0.1 to 200.0 kPa
• inH₂O  »  1 to 2,000 mbar → 0.401463 to 802.926 inH₂O
• mmHg  »  1 to 2,000 mbar → 0.750062 to 1,500.12 mmHg
• inHg  »  1 to 2,000 mbar → 0.0295300 to 59.0600 inHg
• Torr  »  1 to 2,000 mbar → 0.750062 to 1,500.12 Torr

Help

30 mbar to oz/in²

What is the oz/in² conversion for a 0 to 30 mbar pressure range?

30 mbar = 6.96181… oz/in²

0-300 mbar to inH₂O

How does a range 0-300 mbar convert to inH₂O units?

This graphic shows how the range 0-300 millbar converts to inH₂O:

0-300 mbar to psi

What does a 0 to 300mbar range read if converted into psi?

This graphic shows how the range 0-300 millbar converts to psi:

0.5 mbar to inHg

We are looking at sourcing a vacuum pump from Asia for making RTV silicones which is rated in millibars, what does 0.5 mbar equal in “inHg” ?

0.5 mbar = 0.014765 inHg (@0degC)

• 150 mbar combined differential pressure sensor, gauge and logger
• 100 mbarg range 0-5 volts output IP68 silicon diaphragm liquid level sensor
• 800mbar absolute range 4-20mA output high temperature protected OEM pressure sensor
• Trichloroethylene compatible 100 mbar Ex pressure transmitter

Measurement Unit Related Terms

More pages related to measurement unit technical terms.

• at – Technical Atmosphere Pressure Unit
• atm – Standard Atmosphere Pressure Unit
• bar Pressure Unit
• cmH2O – Centimetres of Water Column at 4 deg C Pressure Unit
• cmHg – Centimetres of Mercury at 0 deg C Pressure Unit
• daPa – Dekapascal Pressure Unit
• dyn/cm² – Dyne per Square Centimetre Pressure Unit
• ftH2O – Feet of Water Column at 4 deg C Pressure Unit
• g – Acceleration due to Gravity
• g/cm² – Grams per Square Centimetre Pressure Unit
• hPa – Hectopascal Pressure Unit
• inH2O – Inches of Water Column at 4 deg C Pressure Unit
• inHg – Inches of Mercury at 0 degrees C Pressure Unit
• kg/cm² – Kilogram per Square Centimetre Pressure Unit
• kg/mm² – Kilogram per Square Millimetre Pressure Unit
• kPa – Kilopascal Pressure Unit
• ksi – Kilopounds per Square Inch Pressure Unit
• mH2O – Metres of Water Gauge at 4 deg C Pressure Unit
• mmH2O – Millimetres of Water Column at 4 deg C Pressure Unit
• mmHg – Millimetres of Mercury at 0 deg C Pressure Unit
• MPa – Megapascal Pressure Unit
• mPa – Millipascal Pressure Unit
• mTorr – Millitorr Pressure Unit
• N/cm² – Newton per Square Centimetre Pressure Unit
• N/m2 – Newton per Square Metre Pressure Unit
• N/mm² – Newton per Square Millimetre Pressure Unit
• oz/in² – Ounce per Square Inch Pressure Unit
• Pa – Pascal Pressure Unit
• Pressure
• Pressure Units
• psf – Pounds per Square Foot Pressure Unit
• psi – Pounds per Square Inch Pressure Unit
• Specific Gravity
• Torr Pressure Unit
• tsf – Tons per Square Foot (USA, Short) Pressure Unit
• tsi – Tons per Square Inch (UK, Long) Pressure Unit
• tsi – Tons per Square Inch (USA, Short) Pressure Unit
• Water Density
• µHg – Micron of Mercury at 0 deg C Pressure Unit