You can do precisely that with our cycling wattage calculator, which also calculates your power-to-weight ratio for you. If you are a keen cyclist wondering how your power-to-weight ratio compares to a motor vehicle, you first need to calculate your body's power output. In theory, the truck should be able to accelerate twice as fast as the car, though, in reality, other differences, such as aerodynamic drag ( drag equation), the rolling resistance of the tires, etc., will affect this prediction. So we can see that the pickup truck has double the power-to-weight ratio of the small car. 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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