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kW to hp Converter

Convert kW to hp and back — 1 kW = 1.35962 metric hp. Pick metric or mechanical horsepower, free, instant, no sign-up, full working shown.

Convert kW ⇄ hp

135.962 hp (metric)
100 kW = 135.962 hp (metric)

Formula: 100 kW × 1.35962 = 135.962 hp (metric)

That's 134.102 mechanical hp — the two hp definitions differ by about 1.4%.

How the kw to hp conversion works

The converter applies hp = kW × 1.35962 for metric horsepower (PS), the unit car makers quote in Europe. Going the other way, kW = hp ÷ 1.35962. Switch to mechanical horsepower and the factor is 1.34102 — the imperial unit used in the US and UK.

Worked example: a 100 kW motor is 100 × 1.35962 = 135.962 metric hp, or 100 × 1.34102 = 134.102 mechanical hp. The two hp definitions differ by about 1.4%, which is why a car's quoted hp changes slightly between markets.

Electric cars are usually rated in kW while petrol cars are rated in hp, so this is the conversion you need when comparing them. For more everyday tools, see the full list on the homepage.

kw to hp questions

How many hp is 100 kW?
135.962 metric hp — 100 × 1.35962. In mechanical hp it's 134.102 hp.
How do I convert kW to hp?
Multiply by 1.35962 for metric hp: hp = kW × 1.35962. So 150 kW is 150 × 1.35962 = 203.943 hp.
How do I convert hp back to kW?
Divide by 1.35962: kW = hp ÷ 1.35962. So 200 hp is 200 ÷ 1.35962 = 147.1 kW.
What is the difference between metric and mechanical horsepower?
Metric hp (PS) is 735.5 watts; mechanical hp is 745.7 watts. One kilowatt is 1.35962 metric hp but only 1.34102 mechanical hp — always check which one a spec sheet means.
Why do electric cars quote kW instead of hp?
Kilowatts are the SI unit of power, so EV makers quote motor output in kW. Petrol-car tradition still quotes hp, so comparing the two needs this conversion.

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Sources & official guidance

Estimate only — 1 kW = 1.35962 metric hp (1.34102 mechanical hp); quoted vehicle figures are rounded by manufacturers. See our disclaimer.