Millimeters of mercury to megapascals converter above calculates how many megapascals are in 'X' millimeters of mercury (where 'X' is the number of millimeters of mercury to convert to megapascals). In order to convert a value from millimeters of mercury to megapascals (from mmHg to MPa) just type the number of mmHg to be converted to MPa and then click on the 'convert' button.