**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 inch water [4 °C]

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

millimeter of water to ton/square metre

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

millimeter of water to bar

millimeter of water to centipascal

millimeter of water to foot of air [15 °C]

millimeter of water to hectopascal

millimeter of water to millihg

millimeter of water to picobar