Newtons per square millimeter to megabars conversion calculator above calculates how many megabars are in 'X' newtons per square millimeter (where 'X' is the number of newtons per square millimeter to convert to megabars). In order to convert a value from newtons per square millimeter to megabars (from N/mm² to Mbar) simply type the number of N/mm² to be converted to Mbar and then click on the 'convert' button.