Decanewtons to tonnes-force conversion calculator shown above calculates how many tonnes-force are in 'X' decanewtons (where 'X' is the number of decanewtons to convert to tonnes-force). In order to convert a value from decanewtons to tonnes-force (from daN to tnf) type the number of daN to be converted to tnf and then click on the 'convert' button.