**Full name:** millimeter of water [4 °C]

**Plural form:** millimeters of water

**Symbol:** mmH2O

**Alternate spelling:** mm of water

**Category type:** pressure

**Scale factor:** 9.80665

The SI derived unit for pressure is the pascal.

1 pascal is equal to 0.10197162129779 millimeter of water.

Valid units must be of the **pressure** type.

You can use this form to select from known units:

millimeter of water to kilogram/square centimetre

millimeter of water to newton/square metre

millimeter of water to sthene/square metre

millimeter of water to kilopond/square millimeter

millimeter of water to micron mercury [0 °C]

millimeter of water to megapascal

millimeter of water to pascal

millimeter of water to foot of air [0 °C]

millimeter of water to inch of water [4 °C]

millimeter of water to hectopascal