What is the unit of torque?

[santhosh]

For metric SI units, power is watts, torque is newton metres and angular speed is radians per second (not rpm and not revolutions per second).

Also, the unit newton metre is dimensionally equivalent to the joule, which is the unit of energy.

[vargaalex]

Wikipedia has an excellent article on torque, very concise and to the point, its worth reading to understand torque better.

Torque