Megabars to millimeters of mercury conversion calculator above calculates how many millimeters of mercury are in 'X' megabars (where 'X' is the number of megabars to convert to millimeters of mercury). In order to convert a value from megabars to millimeters of mercury (from Mbar to mmHg) type the number of Mbar to be converted to mmHg and then click on the 'convert' button.