Centimeters of Water Column is a manometric unit used to relate a pressure reading to the height of fresh water at a temperature of 4 degC. 1 Centimeter of Water Gauge equals 98.0665 Pascals.
The cmH2O pressure unit is mostly used to measure breathing on respirators and ventilators which are used in medical and physiological applications such as controlling respiratory conditions or monitoring athletic performance.
There are many ways of writing centimeters of water, but the cause of most confusion are Water Column (WC) and Water Gauge (WG), which both mean exactly the same thing.
For more details on metric water gauge pressure units please see our mWG page.
Please refer to the table below to find the value of 1 cmWC in another pressure unit.
To find the amount of cmWC in a different pressure unit please click on the approriate unit hyperlink in the table below.
Use our website pressure converter to convert multiple values of cmH2o.
Examine how cmH2O is calculated from SI units or check the the different ways of writing mmH2O.
|10||mmH2O 4°C (39.2°F)|
|1||cmH2O 4°C (39.2°F)|
|0.01||mH2O 4°C (39.2°F)|
|0.393701||inH2O 4°C (39.2°F)|
|0.0328084||ftH2O 4°C (39.2°F)|
|0.735559||mmHg 0°C (32°F)|
|0.0735559||cmHg 0°C (32°F)|
|0.0289590||inHg 0°C (32°F)|
|735.559||µHg 0°C (32°F)|
|0.00000634971||tsi (uk, long)|
|0.00000711167||tsi (usa, short)|
|0.00102408||tsf (usa, short)|
Please note that the conversion factors above are accurate to 6 significant figures.
Pressure = Force / Area
Force = Mass x Acceleration
Mass = Density x Volume
Volume = Area x Height
Acceleration = Distance / (Second x Second)
Mass: Kilogram (kg)
Length: Metre (m)
Time: Second (s)
Force: Newton (N)
Pressure: Pascal (Pa)
Density = Water Density at 4degC = 1000 kg/m³
Area = 1 m²
Height = 1 cm = 0.01 m
Acceleration = Standard Gravity = 9.80665 m/s²
1 cmH2O Mass = 1000 kg/m³ x 1 m² x 0.01 m = 10 kg
1 cmH2O Force = 10 kg x 9.80665 m/s² = 98.0665 N
1 cmH2O Pressure = 98.0665 N / 1 m² = 98.0665 Pa
These are the different versions used for identifying cmH2O that you may find elsewhere.
Centimetres of H2O
Centimeters of H2O
Centimetres of Water Column
Centimeters of Water Column
Centimetres of Water Gauge
Centimeters of Water Gauge
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