Correct me if I'm wrong, but the simulator at ebikes.ca calculates newton meters for the motors they sell.
My set-up for instance looks like it puts out ~96 Nm with 18Ah of NiMH and 50 Amp controller. At 35A, 80Nm.
With 66 volts of Dewalt A123 it's 120 Nm.
With that battery pack, 50 Amp controller, the Xlyte 408 is 90 Newton Meters or 60 pounds of thrust.
The explanations are in the notes.