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