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