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