Convert kW to HP – Electric Car Power Calculator

This online calculator converts power from kilowatts (kW) to horsepower (hp, mechanical). Factors follow SI definitions and national metrology references: 1 hp (mechanical) = 745.6998716 W, so 1 kW = 1.34102209 hp. Results round cleanly and suit nameplate ratings, motors, chargers, and engines.

Kilowatts (kW) to Horsepower (hp) Converter

Enter a value in kilowatts to convert it to horsepower (mechanical hp).

Kilowatts (kW)

Result in Horsepower (hp)

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Calculation process will appear here.

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How to Use

Enter a number in the “Kilowatts (kW)” field.
Set “Decimal Places” (0–10) to control rounding shown in the result and calculation note.
Select “Convert” to compute horsepower.
Use “Copy Result” to copy the numeric output.
Choose “Clear All” to reset inputs, result, and the calculation note.
Press “Swap” button to go to HP to kW converter.

Definitions and Unit Facts

Kilowatt (kW) — SI unit of power equal to 1000 watts (W). 1 W = 1 J/s. In U.S. customary terms using mechanical horsepower, 1 kW = 1.34102209 hp. Abbreviation: kW. System: SI. Common on electrical nameplates, EV charging rates, and motor ratings.

Horsepower (hp, mechanical) — U.S. customary/Imperial power unit historically defined as 550 ft·lbf/s, exactly 745.6998716 W. In SI terms, 1 hp = 0.7456998716 kW; 1 kW = 1.34102209 hp. Abbreviation: hp. System: U.S. customary/Imperial. Note: metric horsepower (PS, CV) is different (735.49875 W) and is not used in this calculator.

Conversion Formula

hp = kW × 1.34102209
kW = hp × 0.7456998716

Source: NIST Special Publication 811

Conversion Table

kW	hp
0.10	0.134102
0.20	0.268204
0.50	0.670511
0.75	1.005767
1.00	1.341022
1.50	2.011533
2.00	2.682044
3.00	4.023066
4.00	5.364088
5.00	6.705110
7.50	10.057666
10.00	13.410221
15.00	20.115331
20.00	26.820442
22.00	29.502486
30.00	40.230663
37.00	49.617817
45.00	60.345994
55.00	73.756215
75.00	100.576657