OK, that wasn't as bad as I thought. Thanks to Google, I was able to find Math.com (click on solve for X) and re-learn my basic algebra. So if you know the Nm rating for a vehicle you can guestimate lb ft of Torque by multiplying by .736
Example of a 2005 Mustangs 320 lb ft of Torque;
to get Nm 320/.736 = 434.7826 Nm so to got the other way 434 Nm X .736 = 319.424 or close enough to 320 for any discusion.
I remember thinking I would never use this math as an adult, especially with calculators, but shame on me.