Ans

Unit converter

Mechanical horsepower to kilowatts.

Convert hp to kW and kW to hp. Type in either box and the other follows. Vehicle documents give power in kilowatts; brochures give horsepower. This uses mechanical horsepower, not metric PS.

hp → kWExact definition
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Mechanical horsepower to kilowatts — common values, to 6 significant figures.
hpkW
50 hp37.285 kW
75 hp55.9275 kW
100 hp74.57 kW
125 hp93.2125 kW
150 hp111.855 kW
200 hp149.14 kW
250 hp186.425 kW
300 hp223.71 kW
400 hp298.28 kW
500 hp372.85 kW
1 hp=0.7456998716 kW 1 kW=1.34102209 hp

Definitions

  • Mechanical horsepower is 745.6999 W, defined as 550 foot-pounds per second. It is the horsepower UK and US brochures quote.
  • The kilowatt is 1000 watts. EU vehicle documents give engine power in kW, whatever the brochure says.
  • This conversion is exact by definition. 1 hp = 0.7456998716 kW.
  • Power is converted through W.

How it works

One direction multiplies and the other divides by the same number, so nothing is lost by going back and forth.

The value passes through W, the unit every other power unit on the site is defined against, rather than a number written into this page on its own. That is why the figure here, the figure in the table above and the general power converter always agree.

Display precision limits significant figures rather than decimal places, because one fixed number of decimals is useless across a range this wide. Very large and very small results switch to scientific notation with a proper superscript exponent. The editable box always holds a plain number at full working precision, so you can carry on from either side.

Common questions this answers: how many kilowatts in a horsepower (mechanical) (0.7457), how many mechanical horsepower in a kilowatt (1.34102), and what 150 hp is in kilowatts (111.855 kW).

From the maker of Ans — a scientific calculator you can own. Same idea: a proper instrument, nothing in the way.