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Power to weight ratio : PWR

 Power-to-weight ratio is a measurement of actual performance of any engine or power source. It is also used as a measurement of performance of a vehicle as a whole, with the engine's power output being divided by the weight (or mass) of the vehicle, to give a metric that is independent of the vehicle's size.

 It is defined as per requirement of vehicle performance.

It can be defined in terms of (in SI Units)

 HP/Tonne
Kw/Tonne
Kw/Kg

 Example
Engine Power= 350 Hp
Vehicle GVW=18000 Kg= 18 Tonne

 PWR=HP/Tonne
350/18= 19.5

 Article Contribution by Sandeep Bhasme.
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