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