Centimeters of water to millipascals converter on this page calculates how many millipascals are in 'X' centimeters of water (where 'X' is the number of centimeters of water to convert to millipascals). In order to convert a value from centimeters of water to millipascals (from cmH2O to mPa) type the number of cmH2O to be converted to mPa and then click on the 'convert' button.