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Watts to Horsepower Converter

Convert watts to mechanical horsepower instantly, with a reference table covering engines, motors and appliances.

Watts to Horsepower Converter

1 W = 0.0013 hp

Multiply watts by 0.00134102 to get horsepower.

The link carries the values you entered, so whoever opens it sees the same result. Nothing is stored on our side — the numbers travel in the link itself.

Watts to horsepower reference table

The conversions people look up most often, rounded to 4 decimal places.

Common watts to horsepower conversions
Watt (W)Horsepower (hp)
100 W0.1341 hp
746 W1.0004 hp
1,000 W1.341 hp
5,000 W6.7051 hp
10,000 W13.4102 hp
50,000 W67.0511 hp
75,000 W100.5767 hp
100,000 W134.1022 hp
150,000 W201.1533 hp
200,000 W268.2044 hp
500,000 W670.511 hp

How the watts to horsepower converter calculation works

One mechanical horsepower is 745.7 watts:

horsepower = watts ÷ 745.69987

There is more than one horsepower, and the differences are small but real:

Type Watts Used for
Mechanical (imperial) 745.70 US and UK engine ratings
Metric (PS, CV) 735.50 European car specifications
Electrical 746 Motor nameplates
Boiler 9,809.5 Steam plant

This converter uses mechanical horsepower. A European car rated 150 PS is 110.3 kW, which is 147.9 mechanical hp — the 2% gap is why the same car is quoted with slightly different figures in different markets.

James Watt derived the unit in the 1780s from the rate at which a dray horse could raise coal, deliberately choosing a generous figure so his steam engines would not be oversold against the animals they replaced.

Everyday ratings:

  • A kettle, 3,000 W → 4.02 hp
  • A vacuum cleaner, 1,400 W → 1.88 hp
  • A small EV motor, 80,000 W → 107.3 hp
  • A Tesla Model 3 Performance, 377,000 W → 505.6 hp
  • A family car, 110,000 W → 147.5 hp

Electric vehicles are rated in kilowatts almost everywhere, which is why EV power figures feel unfamiliar: 100 kW is 134 hp, and 200 kW is 268 hp. A quick rule is that kilowatts × 4/3 gives horsepower.

A sustained human output is about 100 W — roughly 0.13 hp — which is a fair measure of how much work an engine replaces.

Frequently asked questions

How do I convert watts to horsepower?

Multiply the number of watts by 0.00134102209 to get horsepower.

How many horsepower are in 10000 W?

10000 W equals 13.4102 hp. The reference table on this page lists the other values people look up most often.

How do I convert horsepower back to watts?

Divide the number of horsepower by 0.00134102209, or use the swap control on the converter above.

Is this conversion exact?

Yes. The factor is fixed by international definition rather than measured, so the conversion is exact - only the displayed rounding limits precision.

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