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