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.

hPa 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.

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Site Last Updated: 09/02/12

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