Watts to Horsepower Converter (W to hp)
1 W = 0.00134102 hp, so about 745.7 W make one mechanical horsepower. Convert motor, e-bike and tool ratings from watts to hp, with both charts.
Horsepower (hp) = Watt (W) × 0.0013410220896
Watt (W): The watt (W) is the SI unit of power, one joule of energy per second. Light bulbs, appliances, chargers and electronics are rated in watts.
Horsepower (hp): The mechanical horsepower selected here is exactly 550 foot-pounds-force per second, about 745.700 W. The bhp alias uses this mechanical unit; brake power describes a measurement of output, while other horsepower definitions, such as metric PS, have different values.
| Watt (W) | Horsepower (hp) |
|---|---|
| 1 | 0.0013410220896 |
| 5 | 0.00670511044798 |
| 10 | 0.013410220896 |
| 25 | 0.0335255522399 |
| 50 | 0.0670511044798 |
| 100 | 0.13410220896 |
Small motors are rated in watts in most of the world but often in horsepower in US hardware stores: a shop vacuum, a table saw, a well pump or an e-bike hub might carry either label. One mechanical horsepower is 745.7 watts, so even a modest 1,500 W appliance motor works out to about 2 hp.
US federal rules draw a line at that size: a low-speed electric bicycle is defined as having a motor of less than 750 watts (1 h.p.), while the EU caps pedal-assist bikes at a continuous 250 W. Converting watts to horsepower shows how small the EU limit is, about a third of a horsepower.
How to use this tool
- Type a value in the Watt box to see it in horsepower, or type in the Horsepower box to convert the other way.
- Press ⇄ to swap the two units, or Load example for a typical value.
- Check the charts below for common values; for other units, open the Power converter.
Formula
Horsepower (hp) = Watt (W) × 0.0013410220896
Watt (W) = Horsepower (hp) × 745.699871582
Both factors come from exact definitions: 1 horsepower = 745.699871582 watts and 1 watt = 0.0013410220896 horsepower (shown to 12 significant digits).
Example
Two conversions worked with the same factors the converter uses:
750 W × 0.0013410220896 ≈ 1.00577 hp
2 hp × 745.699871582 ≈ 1491.4 W
Watt to Horsepower chart
Common values from watts to horsepower, rounded to four decimal places.
| Watt (W) | Horsepower (hp) |
|---|---|
| 100 | 0.1341 |
| 200 | 0.2682 |
| 250 | 0.3353 |
| 300 | 0.4023 |
| 350 | 0.4694 |
| 400 | 0.5364 |
| 500 | 0.6705 |
| 550 | 0.7376 |
| 600 | 0.8046 |
| 750 | 1.0058 |
| 800 | 1.0728 |
| 1,000 | 1.341 |
| 1,100 | 1.4751 |
| 1,200 | 1.6092 |
| 1,500 | 2.0115 |
| 1,800 | 2.4138 |
| 2,000 | 2.682 |
| 2,200 | 2.9502 |
| 3,000 | 4.0231 |
| 3,700 | 4.9618 |
| 5,000 | 6.7051 |
| 7,500 | 10.0577 |
Horsepower to Watt chart
The reverse direction for values people often look up.
| Horsepower (hp) | Watt (W) |
|---|---|
| 0.1 | 74.57 |
| 0.17 | 126.769 |
| 0.25 | 186.425 |
| 0.33 | 246.081 |
| 0.5 | 372.8499 |
| 0.75 | 559.2749 |
| 1 | 745.6999 |
| 1.25 | 932.1248 |
| 1.5 | 1,118.55 |
| 2 | 1,491.4 |
| 3 | 2,237.1 |
| 5 | 3,728.5 |
Power ratings given in watts
| Item | Watt (W) | Horsepower (hp) |
|---|---|---|
| EU pedal-assist e-bike, maximum continuous motor rating | 250 | 0.3353 |
| One electrical horsepower | 746 | 1.0004 |
| US low-speed e-bike, motor must stay under | 750 | 1.0058 |
| Microwave oven, a common cooking power | 1,000 | 1.341 |
| US portable space heater, common maximum | 1,500 | 2.0115 |
| US hair dryer, a common rating | 1,875 | 2.5144 |
Quick mental estimate
Divide by 750: 1,500 W → 2 hp. Dividing by 750 instead of 745.7 makes the result about 0.6% low, a difference that disappears in the rounding of most motor ratings.
Use the converter or the charts when the exact figure matters.
The two units
Watt (W): The watt (W) is the SI unit of power, one joule of energy per second. Light bulbs, appliances, chargers and electronics are rated in watts.
Horsepower (hp): The mechanical horsepower selected here is exactly 550 foot-pounds-force per second, about 745.700 W. The bhp alias uses this mechanical unit; brake power describes a measurement of output, while other horsepower definitions, such as metric PS, have different values.
Frequently asked questions
How many watts are in one horsepower?
One mechanical horsepower is 745.6999 W. Electrical horsepower, used on many motor nameplates, is set at exactly 746 W, and metric horsepower is 735.49875 W.
Is a 750 W e-bike motor 1 horsepower?
Almost: 750 W is about 1.006 hp. US rules describe the low-speed e-bike limit as "less than 750 watts (1 h.p.)", treating the two as the same figure.
Can I compare a motor's watts with an engine's horsepower?
Yes, both measure power, so the conversion is exact. Check whether the watt figure is input power (what the motor draws from the outlet) or output power (what it delivers at the shaft); output is always the lower of the two. Motor nameplate horsepower normally states shaft output, while appliance labels in watts usually give the input.
How precise is the result?
The converter uses the exact definitions above with browser floating-point arithmetic and shows up to 12 significant digits. The charts round to four decimal places for reading.
Sources
Last updated:
Page address with these inputs: https://kakao.mobile/tools/watt-to-horsepower-converter/
Cite or embed this tool
kakaoCalc. (2026, November 8). Watts to Horsepower Converter (W to hp). https://kakao.mobile/tools/watt-to-horsepower-converter/
“Watts to Horsepower Converter (W to hp).” kakaoCalc, 8 Nov. 2026, kakao.mobile/tools/watt-to-horsepower-converter/.
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