**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 .

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

You can use this form to select from known units:

millimeter of water [4 °C] to ton/square metre

millimeter of water [4 °C] to kip/square foot

millimeter of water [4 °C] to kilogram-force/square metre

millimeter of water [4 °C] to pound/square inch [absolute]

millimeter of water [4 °C] to micron of mercury [0 °C]

millimeter of water [4 °C] to meter of head

millimeter of water [4 °C] to

millimeter of water [4 °C] to barye

millimeter of water [4 °C] to yoctobar

millimeter of water [4 °C] to centihg