Newtons per square millimeter to millibars converter on this page calculates how many millibars are in 'X' newtons per square millimeter (where 'X' is the number of newtons per square millimeter to convert to millibars). In order to convert a value from newtons per square millimeter to millibars (from N/mm² to mbar) simply type the number of N/mm² to be converted to mbar and then click on the 'convert' button.