Whenever cars are discussed or their performance is compared, it is all about HP. This is a term that is almost certain to crop up when you want to buy a new or used car, but what does the HP figure actually mean? Here is everything you need to know!

What does HP mean for a car?

Alongside assistance systems, performance is often the deciding factor when choosing a car. It is usually stated in HP, which stands for horsepower. But where does this term actually come from?

The concept of horsepower was coined by the Scottish engineer James Watt (1736–1819). Although Watt did not invent the steam engine, he is famous for its groundbreaking increase in efficiency. To market his machines more effectively, he needed a comparative value that people at the time could visualise: the working power of a horse.

Watt originally observed ponies pulling baskets of coal upwards in a mine. To ensure his steam engines exceeded customer expectations, he calculated generously and defined the power of a strong working horse as 33,000 foot-pounds per minute. In simple terms, this means a horse is capable of lifting a weight of 33,000 pounds by one foot within one minute. Thus, a unit of measurement was born which—despite being long since replaced by the Watt (W) or Kilowatt (kW) in physics—persists in everyday language worldwide to this day.

HP in transition: The era of electric cars

Nowadays, the classic HP figure is increasingly losing significance. With the rise of electric cars, other factors are moving to the forefront:

• Kilowatt (kW): In the EU and Switzerland, kW has been the legal unit for decades. For electric cars, this value is now becoming the global standard, as it describes electrical power directly.

• Torque: Electric drives deliver their full power instantly from a standstill. Therefore, torque (measured in Newton metres, Nm) is often more meaningful for the feeling of acceleration than pure peak HP.

• Efficiency and range: Since modern electric motors are very powerful anyway, buyers today pay less attention to the maximum HP figure and more to battery capacity (kWh) and energy consumption per 100 kilometres.

Horsepower remains a charming relic from the industrial revolution that is slowly fading into the background in a digitised and electrified world.

HP or kW? Performance measurement and its development

There are actually various units that provide information about the performance of a car. HP remains the most popular unit for manufacturers in Switzerland and large parts of Europe. However, its dominance is waning, as the legally preferred unit is now Kilowatt (kW).

There is a simple conversion for this: one kilowatt corresponds to approximately 1.36 HP. Even if switching to kW takes some getting used to, it makes sense in the long run, especially due to the advancement of electric cars. Since electrical power is physically measured in kW, it is only logical that manufacturers establish this unit as the standard.

The cost factor of performance

Be aware that cars with extremely high performance often suffer from steeper depreciation and are significantly more expensive to maintain. Higher HP figures usually mean higher costs for insurance, taxes, and servicing. More power literally comes at a price.

Specifics of electric cars

Electric cars often possess an extreme amount of HP, as electric motors are compact and relatively cheap to manufacture. However, there is a decisive advantage regarding maintenance: they are often cheaper to service than combustion cars of equal strength, as many wear parts like spark plugs, oil filters, or timing belts are completely eliminated. Nevertheless, insurance remains a costly factor for high-performance models.

Torque: What it means and why it matters

A term you will encounter repeatedly in this context is torque. Measured in Newton metres (Nm), it indicates how much "force" the engine transfers to the drive shaft. Put simply: torque is the pulling power, while the HP figure describes endurance at high speeds.

High torque ensures that the car feels powerful when pulling away and accelerates well from low revs. For those who want to drive efficiently, you should shift up at the end of the peak torque range. However, if you are looking for maximum acceleration, you utilise the entire rev range up to the maximum HP output.

In electric cars, the driving experience is so impressive because the full torque is available immediately from the very first revolution. There is no delay. While horsepower determines how fast the car can go at its maximum, torque significantly dictates how effortless and punchy it feels in everyday driving.

How does the HP figure affect fuel consumption?

The question of how HP affects petrol consumption can be answered quite simply from a physics perspective: to generate more power, more energy must be converted. Since petrol is the energy source for a combustion engine, the demand for fuel generally increases with performance. However, modern technology makes this calculation much more complex today.

The mechanical side

An engine with high HP is often larger. More cylinders and larger displacements mean that more metal parts must be moved inside the engine. These internal friction losses mean that a high-performance engine consumes more than a smaller engine, even at idle.

Efficiency

Interestingly, more power does not mean massively higher consumption in every scenario. A small engine with low HP often has to struggle at high speeds on the motorway or during mountain climbs. It then operates in an inefficient range. A more powerful engine can often perform the same task effortlessly at lower revs.

Driving style

Ultimately, the HP figure is primarily an indicator of consumption potential. If you call upon the full power of your car to accelerate rapidly, you push the instantaneous consumption sky-high.

Efficiency in focus: The modern dilemma

Today, manufacturers try to resolve the conflict between high performance and low consumption through technologies such as turbocharging or hybridisation. This allows high HP values to be achieved without everyday consumption reaching astronomical heights.

Whether you choose an economical model with less HP or a high-performance car depends heavily on your personal driving profile. Those who travel a lot in the city benefit from less HP and lower weight, while a more sovereign engine certainly has its advantages on long journeys.

Car selection at Carvolution: The right model for everyone

At Carvolution, you will find a large selection of cars for every taste and need. Whether you are looking for a car with high or low HP—the choice is yours.

Under this link, you will find our entire range of cars. There is bound to be the perfect car for you. And here you can directly book an appointment for a personal consultation.