We all need relief when we want to compare the performance of different vehicles, which is why there is a **power-to-weight ratio calculator. **The following text will explain how to calculate the power-to-weight ratio and why you need it so much.

Don’t hesitate to visit other interesting posts from the physics section. But also, make sure to see other related sections, such as statistics and this related Central Limit Theorem, or Probability of 3 Events calculator.

**What is the power-to-weight ratio calculator? Definition**

A **power-to-weight ratio calculator** is a calculation commonly applied to **engines** and mobile power sources that allows one unit or design to be compared. **The PWR calculator** measures the actual specifications of any engine. Calculators are also used as a measurement specification for a vehicle or **vehicle** complete with engine power, divided by the weight or **mass** of the vehicle, giving measurement data that are independent of vehicle size.

**How to calculate the power-to-weight ratio?**

The contact **or ratio of strength and weight** will be most easily explained through the example of cycling. Suppose we have two bikes; one bike can consume 250w **of power** and the other only 240w; both cyclists will race in the race to the top of the climb. The question is, who will win the race to the top? From a logical point of view, when we calculate it, it will be like this; the winner will be a bike from 250w of power in a race. But, not if the cyclist on that bike weighs 100kg and the other cyclist weighs 75kg. This is because it is difficult to carry more weightiness uphill. It’s the same with **engines**. More potent engines have more power than weaker ones, but it’s harder to carry their **weight** in these conditions.

Therefore, the **PWR calculato**r helps assess real-world conditions and obstacles performance.

**Calculation of power-to-weight ratio**

Before explaining **the calculation of the PWR**, it should be mentioned that the typical unit of measure of the **PWR** is W kg.

The designation we use for engine power is (**P**), regarding the power produced by the engine is divided by its weight (**W**). **P- toward – W = P/W** We will give a classic instance for a V-8 turbocharged engine that can have a 250 **horsepower** engine and can weigh 450 **kg** (1000 Ib) which gives a power of 0.42 kW (0.25 horsepower / Ib) It is important to note that, in most cases, we can use a calculator to calculate the vehicle’s **power** without the weight of the person or some other load. However, this can lead us to deviations about motorcycles and bicycles because the rider himself can have 1/3 to 1/2 the **weight** of the vehicle itself.

**Chart of power-to-weight ratio**

Engine | Power-to-weight ratio | Total output power |

Space Shuttle – Turbo engine | 100 horsepower / lb / 164,120 W / kg | 70,000 horsepower / 52,198kw |

V8 Diesel engine with turbo | 0.25 horsepower / lb / 410 W / kg | 250 horsepower / 186.42 kW |

Boeing 777 GE90-115B jet engine | 6.10 horsepower / lb / 10,041 W / kg | 111,526 horsepower / 83,164kw |

**Examples of calculating the power-to-weight ratio**

PMR is defined as follows:

PMR = (Pn / mt) × 1,000 kg / kW

The power-to-mass ratio index (**PMR**) is used to calculate acceleration.

The basic unit to calculate the power-to-weight ratio is ** \frac{w}{kg} equal to \frac{m^2 }{s^3} **

This fact allows the display of the power-to-weight ratio using the **SI unit**. The ratio of power and speed of vehicles, planes, rockets, and others is equal to the acceleration multiplied by the speed.

**Best power-to-weight ratios**

Recently, more and more manufacturers are offering better and more efficient **motor-powered products**. As a result, people are increasingly interested in vehicles or transports with an excellent **PWR calculator**. Below is an exemplar of a vehicle with an **excellent PWR**:

Two-stroke engines have the best **power-to-weight ratio calculator**, motorcycle engines, and motorboats with low power up to – 5 horsepower.

They are easy to operate, lightweight allow you to carry them without outside help. Moreover, engines are economical and have low fuel consumption.

**Increasing the power-to-weight ratio**

We will take a simple example of a horse, the average horse that is **strong one horsepower** can lift one object that weighs 75 kg in 60 minutes and pull it for 1 minute. More recently, we have said that it has replaced the metric system. We **express power in W**, apropos in kw. When we convert these values the ratio will be as follows: **1horse power = 0.735 kW or 1Kw = 1.35962 hp**

Since we live in the age of motor vehicles, and we have used them the most throughout the text, we will also explain how **they increase the power-to-weight ratio calculator**. The “torque” plays a vital role in increasing strength and weight, and it is equal to the product of the force and the distance of the place where that force acts. The force you use is denoted by the unit **Nm “torque**.”

**We will increase the PWR ratio calculator** with the help of torque, which is engine speed. The higher the engine speed, the higher the amount of fuel burned, and therefore we get a **higher power ratio.**

Simply, more revs – **more power**.

## Significance of power-to-weight ratio calculator

**The importance of the power-to-weight ratio calculators** is crucial to us to determine or know how an engine will behave at a given moment, how much speed it will develop about its weight, whether it is good or bad for our needs, whether it will be strong enough to the mass to be carried, pulled and similar. A power-to-weight ratio calculator can facilitate several calculations.

## FAQ

**What is power-to-weight ratio?**

The power-to-weight ratio is the natural characteristic of a motor vehicle. It is used by dividing the power of one engine by the mass it carries and drives.

**Why is the PWR ratio calculator good for us?**

PWR calculator helps assess the power of an engine or drive about what we need and whether it will meet our needs in the given conditions. In addition, the calculator gives us complete privacy to calculate the power-to-weight ratio for everything we need.

**How is the PWR calculated? Formula**

The power-to-weight ratio is calculated by dividing the power of an engine or starter by its total weight and the weight it carries under given conditions.

Formula: **P- toward – W = \frac{P}{V} **

**What is the significance of the PWR ratio calculator?**

The significance of the power-to-weight ratio calculator is that it can predict performance quite accurately and calculate the power-to-weight ratio under special conditions in certain places.