Centimeters of water to pascals conversion calculator above calculates how many pascals are in 'X' centimeters of water (where 'X' is the number of centimeters of water to convert to pascals). In order to convert a value from centimeters of water to pascals (from cmH2O to Pa) just type the number of cmH2O to be converted to Pa and then click on the 'convert' button.