Kilowatts to Horsepower

Reading an EV Spec Sheet When You Think in Horsepower

Electric cars are engineered in kilowatts, so that is what the technical data sheet, the type-approval document and most European brochures print. If twenty years of car shopping taught you what 150 hp feels like on a slip road, a line reading "motor output 110 kW" gives you nothing to hold on to until it becomes a horsepower figure.

Conversion factor: 1 kW = 1.34102209 hp, so multiply the kilowatt figure by roughly 1.341. A 110 kW family hatchback is 147.5 hp — squarely in the territory of the 1.6-litre petrol cars most buyers are trading in.

What Changes When the Engine Is a Motor

The badge stopped meaning litres

Displacement disappeared along with the engine, so makers name trims after output instead. A number on the tailgate is now a power claim, and in Europe it is usually the kilowatt one.

Headline figures are short bursts

The advertised kilowatts are normally peak output that the motor and inverter sustain for a handful of seconds before thermal limits pull them back to a lower continuous rating.

Two kilowatt numbers on one page

A brochure quotes motor output and DC charging rate in the same unit. One moves the car, the other fills the battery, and only the first belongs in a horsepower comparison.

System power, not motor arithmetic

On a dual-motor car the quoted figure is what the pack and inverters can deliver together, which is normally less than the two axle motors added up.

Sizing Up an Electric Car Against the Petrol One You Know

Most shoppers do this in a showroom or with three configurator tabs open, weighing a car they are considering against the one already on the driveway.

Enter the motor output from the data sheet

Type the kilowatt figure — 87, 110, 150, 160 — into the left field and the horsepower equivalent appears as you type. A comma works as the decimal separator, so 147,5 reads the same as 147.5.

Look for the continuous rating as well

Technical annexes often list a maximum 30-minute or continuous power beside the peak. Convert both and you learn the band the car actually lives in, not just its launch-control moment.

Turn it round for the combustion rival

Cross-shopping a 204 hp turbo saloon? Press the swap button (↔) to run hp → kW and meet the electric car on its own ground: 204 hp comes to 152.1 kW.

Copy the number into your shortlist

The copy button puts the plain number on the clipboard with no unit and no spaces, which is what a spreadsheet cell wants. Ctrl + C inside a field does the same.

Check which horsepower the rival quotes: a German or Japanese brochure printing 204 next to a kilowatt figure is almost certainly using metric horsepower, a slightly smaller unit than the mechanical hp this page produces.

Motor Ratings of Cars You Can Actually Buy

A spread of production electric cars from city runabouts to performance saloons, with the kilowatt figure off the data sheet and what it comes to in mechanical horsepower.

Class of car	Motor output	Horsepower	What the figure represents
Budget city EV	33 kW	44.3 hp	Peak; fine for urban speeds, thin on a motorway slip road
Small hatchback	87 kW	116.7 hp	Peak output of a supermini-sized single motor
Compact family EV	110 kW	147.5 hp	The mainstream figure, matched to a 1.6-litre petrol feel
Mid-size hatch, higher trim	150 kW	201.2 hp	Peak; the continuous rating sits far below it
Compact SUV, long range	160 kW	214.6 hp	Peak drive power at a healthy state of charge
Performance crossover, dual motor	430 kW	576.6 hp	Combined system power in a boost mode, not a steady state
Flagship saloon, overboost	700 kW	938.7 hp	Launch-control peak lasting a couple of seconds
The same saloon, sustained	460 kW	616.9 hp	What that car can hold once the burst is over

The last two rows are the point of the exercise. One car legitimately carries two very different horsepower numbers, and the one on the poster is the one it can hold for about as long as a traffic-light gap. An engine will happily produce its quoted output all afternoon; an electric drivetrain's headline figure is far more of a peak than buyers expect.

How the Converter Fits a Showroom Comparison

Both boxes move while you scan a price list

Type into either side and the other follows immediately, so you can run down a whole trim table without clearing anything between models.

Flip direction when the rival brochure is in hp

One press of the swap button puts horsepower on the left, the direction you want when it is the combustion car being translated.

Any power unit for the rest of the data sheet

The searchable dropdowns hold every power unit, so the same page copes with a metric horsepower badge figure or a heat-pump rating further down the page.

Clean figures for a shortlist spreadsheet

Results carry up to eight decimals with thousands separated by a space, and the copy button hands over the bare number without the unit attached.

Questions From the Showroom Floor

Is the kW on an EV spec sheet the peak figure or what the car can hold?

Almost always the peak. Motors, inverters and battery packs all accept a large overload briefly while there is thermal headroom, and marketing quotes that moment. Where a continuous or 30-minute rating is published it is often less than half the headline number: a drive unit quoted at 240 kW peak may be a 120 kW continuous machine, which is 321.8 hp against 160.9 hp for the very same hardware.

Why does my EV feel slower when the battery is nearly empty?

Power leaves the pack as volts times amps, and pack voltage sags as the state of charge falls. Below roughly 20 % many cars trim available drive power to protect the cells, so a 160 kW car may only offer around 100 kW — 214.6 hp becoming 134.1 hp. Very cold cells, and a heat-soaked motor after repeated hard runs, do much the same thing.

The car lists a 150 kW motor and 150 kW charging — are they the same thing?

No, and the coincidence is unlucky. Motor kilowatts are mechanical power sent to the wheels; charging kilowatts are electrical power flowing into the pack at a DC rapid charger. Converting the charging figure to horsepower tells you nothing about performance. Only the drive figure, the one in the performance section of the data sheet, belongs in an hp comparison.

Do I add the two motor ratings together on a dual-motor car?

Not when a system figure is given. The pack sets a ceiling on total current, so a car with a 150 kW rear motor and an 80 kW front motor may be homologated at 200 kW rather than 230 kW. Convert the published system figure — 200 kW is 268.2 hp — and read the individual axle ratings as information about torque split instead of something to sum.

A 160 kW EV out-accelerates a 215 hp petrol car — has the conversion gone wrong?

The arithmetic is right: 160 kW is 214.6 hp. What differs is how the power arrives. A motor makes full torque from a standstill and needs no gearchanges, while a turbo engine has to reach several thousand rpm and swap ratios to touch its peak. Horsepower describes the rate of doing work at one operating point, not how fast a car gets there — which is why matching hp figures rarely means matching stopwatch times.