PWR of small car = 89 hp / 2546 lb = 0.035 hp/lb PWR of pickup truck = 290 hp / 4069 lb = 0.071 hp/lbĪnd for the small Ford Fiesta, the calculation is as follows: For the pickup truck, the calculation is as follows: Let's go back to the two examples at the top of the page and calculate their power-to-weight ratios (PWRs). We talk more about this in our weight on other planets calculator. So if you wanted to calculate the power-to-weight ratio of the Moon buggy, for example, you would use its mass rather than its weight as measured on the Moon, which would be one-sixth of that measured on Earth. It's important to note that the word "weight" used throughout this article is a colloquial term for mass. However, because it is very lightweight, its power-to-weight ratio will be much greater than that of a typical car. An example of a quickly accelerating vehicle is a motorbike, which can have an average amount of power. If a car has a higher power output per pound than another vehicle, it will be able to accelerate that pound of weight more quickly. The two most common power-to-weight ratio units are horsepower per pound ( hp/lb) and kilowatt per kilogram ( kW/kg). But what does that mean exactly? It is a measure of how much power the vehicle can produce per unit of weight. The solution is to divide the vehicle's power by its weight (or mass) to get the power-to-weight ratio. What we need is a metric that doesn't depend on the size of the vehicle. How can we fairly compare their performance using these numbers? For example, a Ford F-series pickup truck has a peak power output of 290 hp ( 216 kW) and weighs 4,069 lb ( 1,846 kg), while a Ford Fiesta produces 89 hp ( 66 kW) and weighs 2,546 lb ( 1,155 kg). Different vehicles produce varying quantities of power and weigh different amounts.
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