What is power to weight ratio in a car ?

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.

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The power of the engine divided by the weight of the car.

It is usually mentioned as a measure of a car's potential to accelerate.

Car with a higher power to weight ratio is expected to accelerate faster.

F1 cars have about 700kg and about 860HP which indicates a power-to-weight ratio of around 1240bhp per tonne.

IndyCars produce over 900bhp per tonne.

NASCAR machines have about the same power as F1 but they are much heavier

(1515kg incl. driver) which results in about 560bhp per tonne.

The highest power-to-weight ratio is in sprint racing where some cars have over 900HP to only 640 kg of weight meaning PtW ratio 1400 HP/t

For comparison, typical Mercedes-Benz E-Class has about 200 HP per 1800kg meaning modest 111 HP per tonne.

it's the power of the engine divided by the weight.

power could be measured at the engine output or at the wheels, read the fine print.

possible units:

HP/pound

watts/kg

kw/kg

BTU/hr/pound

etc