Horsepower alone doesn’t tell you much about how fast a car actually feels.
On paper, a 450-hp muscle car that weighs 1,724 kg and a 152-hp Caterham that weighs 540 kg sound like different machines, but the lightweight one has a better power-to-weight ratio: around 282 hp per ton versus roughly 261 hp per ton.
Our calculator accepts hp, PS or kW alongside kilograms or pounds and converts everything for you. Enter your car’s output and weight to get the figure in every common unit.
Power-to-Weight Ratio Calculator
Enter your car’s power output and kerb weight to see how much power it carries per tonne.
Use the manufacturer’s kerb (curb) weight for the most accurate result.
Power-to-weight ratio
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hp per tonne
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- Metric power-to-weight—
- Metric horsepower—
- Weight carried per hp—
- Weight carried per hp (imperial)—