Units

Torque has dimensions of force times distance. Official SI literature suggests using the unit newton metre (N·m) or the unit joule per radian.[7] The unit newton metre is properly denoted N·m or N m.[8] This avoids ambiguity with mN, millinewtons.

The joule, which is the SI unit for energy or work, is dimensionally equivalent to a newton metre, but it is not used for torque. Energy and torque are entirely different concepts, so the practice of using different unit names for them helps avoid mistakes and misunderstandings.[7] The dimensional equivalence of these units, of course, is not simply a coincidence: A torque of 1 N·m applied through a full revolution will require an energy of exactly 2π joules. Mathematically,

E= \tau \theta\

where E is the energy, τ is magnitude of the torque, and θ is the angle moved (in radians). This equation motivates the alternate unit name joules per radian.[7]

Other non-SI units of torque include "pound-force-feet", "foot-pounds-force", "inch-pounds-force", "ounce-force-inches", and "metre-kilograms-force". For all these units, the word "force" is often left out,[9] for example abbreviating "pound-force-foot" to simply "pound-foot". (In this case, it would be implicit that the "pound" is pound-force and not pound-mass.)

And "J" is not the correct Unit (in SI-System)

The joule, which is the SI unit

Hello,

Sorry but I think you did it wrong.
It is not 'Nm but 'N*'m. See the example please:
Open in SMath Cloud

Regards,
Radovan

I typed it in the way kadpeter's example shows, but I'm still getting Joules as the resulting unit of measure...