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