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