Watts to Horsepower Converter
Quick answer: To convert watts to horsepower, multiply by 0.001341022. For example, 10 W is 0.01341022 hp. One watt equals 0.001341022 hp.
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Use the Watts to Horsepower Converter
Watts to Horsepower formula and what each symbol means
hp = W × 0.001341022
| Symbol | Meaning |
|---|---|
| W | Watt |
| hp | Horsepower |
Watts to Horsepower examples
1 W
1 W × 0.001341022 = 0.001341022 hp.
10 W
10 W × 0.001341022 = 0.01341022 hp.
100 W
100 W × 0.001341022 = 0.1341022 hp.
Watts compared with Horsepower
One hp is 745.7 times as large as one W, so your number gets smaller when you convert watts to horsepower and bigger when you convert back. If the answer is not smaller than what you typed, you multiplied instead of dividing.
About watts and horsepower
Watt (W): The SI unit of power, one joule per second. Horsepower (hp): Mechanical horsepower, about 745.7 watts.
Where watts to horsepower conversions are used
Engines and motors are rated in kilowatts or horsepower, depending on the market. Appliances and chargers list their draw in watts, while air conditioners may quote BTU per hour.
How to calculate Watts to Horsepower step by step
- Enter the value in W (the starting unit).
- Multiply by 0.001341022, because 1 W = 0.001341022 hp.
- The product is the value in hp. To go back, divide by 0.001341022 or multiply by 745.6999.
Popular power conversions
How to read your Watts to Horsepower result
Quick estimate: multiply by about 0.00134 to get horsepower from watts; this is within 0.1% of the exact factor. Power is energy per time.
| WATTS | HORSEPOWER |
|---|---|
| 1 | 0.001341022 |
| 2 | 0.002682044 |
| 5 | 0.00670511 |
| 10 | 0.01341022 |
| 20 | 0.02682044 |
| 50 | 0.0670511 |
| 100 | 0.1341022 |
| 1,000 | 1.341022 |
Horsepower to Watts: quick table
| HORSEPOWER | WATTS |
|---|---|
| 1 | 745.6999 |
| 5 | 3,728.499 |
| 10 | 7,456.999 |
| 25 | 18,642.5 |
| 50 | 37,284.99 |
| 100 | 74,569.99 |
| 250 | 186,425 |
| 500 | 372,849.9 |
Common mistakes when calculating Watts to Horsepower
- Assuming all horsepower figures are the same: mechanical hp is about 1.4% larger than metric PS.
- Dividing when you should multiply: from W to hp multiply by 0.001341022; from hp to W divide by 0.001341022.
Watts to Horsepower FAQ
How many hp are in 1 W?
1 W equals 0.001341022 hp.
How many W are in 1 hp?
1 hp equals 745.6999 W.
Is 1 W = 0.001341022 hp an exact conversion?
The factor is shown rounded to 7 significant figures (0.001341022). The calculator above uses more digits.
What is a horsepower (hp)?
Mechanical horsepower, about 745.7 watts.
How can I estimate watts to horsepower in my head?
Quick estimate: multiply by about 0.00134 to get horsepower from watts; this is within 0.1% of the exact factor.
What is 300 W in horsepower?
300 W = 0.4023066 hp (since 300 × 0.001341022).
What is 12 W in horsepower?
12 W = 0.01609227 hp (since 12 × 0.001341022).
What is 60 W in horsepower?
60 W = 0.08046133 hp (since 60 × 0.001341022).
How many decimals should I keep when converting W to hp?
Match the precision of your original measurement. For example, 0.01341022 hp rounds to 0.0134 hp at 3 significant figures; keep more digits only for engineering or scientific work.
More in Power converters
- Watts to PS Converter
- PS to MW Converter
- BTU per Hour to Horsepower Converter
- PS to kW Converter
- BTU per Hour to kW Converter
- PS to Horsepower Converter
See all power converters tools · All Conversion calculators · Site map
Method, review and disclaimer
Edited by: Hemant Kumar and Anjita Rai, founders of ToolsVault (SEO and content professional, not a licensed adviser). Method: this tool runs in your browser using the formula shown on this page; the numbers you enter are not sent to our servers. Sources: NIST SP 811, Appendix B.8: conversion factors