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hPa – Hectopascal Pressure Unit

Hectopascal is a 100x multiple of the pascal, which is the SI unit for pressure. The hectopascal is the international unit for measuring atmospheric or barometric pressure. 1 hectopascal equals 100 pascals.

Due to its low value the hectopascal is ideal for use as a measure of atmospheric pressure and other low gas pressures such as air flow differentials in air conditioning systems or wind tunnels.

One hectopascal is exactly equal to one millibar and although the scientific community has officially adopted the hectopascal in preference to the millibar, the millibar is still used extensively throughout the world due to the proliferation of its use historically.

You can convert a reading in hectopascals into different engineering units by multiplying it by the appropriate conversion factor in the list below.

Alternatively you can let the pressure unit converter do the calculation for you.

Featured hpa - hectopascal, mbar - millibar unit range pressure measurement products

  • Vacuum digital gauge to measure 0 to 1000 mbar absolute - We have a need for a general vacuum digital gauge which can display 0-1000mbar vacuum as absolute readings.
  • Gas supply 100 mbar static pressure transmitter for boiler room - Stainless steel based compact pressure transmitter for measuring pressure of incoming boiler room natural gas supply up to 100 mbar gauge.

Contents

Toggle
  • Conversion Factors
  • Conversion Tables
  • Help
    • hPa to mb units
    • Barometric pressure

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.

Featured hpa - hectopascal, mbar - millibar unit range pressure measurement products

  • Vacuum gauge for minus 150 mbar range with a 0.1 mbar display resolution - We are looking to measure have to measure vacuum from zero to -150mbar to a resolution of 0.1 milibar
  • 800 to 1200 mbar atmospheric pressure transmitter - Reliable barometric pressure sensor for OEM applications requiring atmospheric pressure compensation in scientific and process instrumentation.

Conversion Tables

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

  • psi  »  1 to 2,000 hPa → 0.0145038 to 29.0075 psi
  • bar  »  1 to 2,000 hPa → 0.001 to 2.000 bar

Help

hPa to mb units

What is the conversion from hpa to mbs, e.g. 1018 hPa to mbs?

The hPa (hectopascal) unit has exactly the same value as mb (millibar) unit, so the conversion is one to one, 1018 hPa = 1018 mbs exactly.

Barometric pressure

What does hPa mean in relation to barometric pressure?

hPa is the abbreviated name for hectopascal (100 x 1 pascal) pressure units which are exactly equal to millibar pressure unit (mb or mbar). The hectopascal or millibar is the preferred unit for recording and predicting barometric or atmospheric pressure in European and many other countries weather reports. Despite the official directive by the World Meteorological Organisation in 1986 to phase out the use of the millibar in favour of the hectopascal, it is still widely used.

Featured hpa - hectopascal, mbar - millibar unit range pressure measurement products

  • Dirty water, sludge & sewerage tank level 400 mbar pressure sensor - Flush ceramic diaphragm pressure sensor for measuring level of a dirty water, sludge & sewerage tank.
  • 700 to 1100 millibar scaled 4 to 20mA output pressure sensor for barometric pressure measurement - 4-20mA output transmitter for monitoring barometric pressure from 700 to 1100 mbar absolute.

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Wirelessly Measure & Log Pressure

Use this battery powered wireless pressure sensor to transmit readings to a receiver connected to USB, RS485, RS232, cellular network or analog output

Use this battery powered wireless pressure sensor to transmit readings to a receiver connected to USB, RS485, RS232, cellular network or analog output

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