Horsepower to Watts Converter
Quick answer: To convert horsepower to watts, multiply by 745.6999. For example, 10 hp is 7,456.999 W. One horsepower equals 745.6999 W.
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Use the Horsepower to Watts Converter
Horsepower to Watts formula and what each symbol means
W = hp × 745.6999
| Symbol | Meaning |
|---|---|
| hp | Horsepower |
| W | Watt |
Horsepower to Watts examples
1 hp
1 hp × 745.6999 = 745.6999 W.
10 hp
10 hp × 745.6999 = 7,456.999 W.
100 hp
100 hp × 745.6999 = 74,569.99 W.
Horsepower compared with Watts
One hp is 745.7 times as large as one W, so your number gets bigger when you convert horsepower to watts and smaller when you convert back. If the answer is not larger than what you typed, you divided instead of multiplying.
About horsepower and watts
Horsepower (hp): Mechanical horsepower, about 745.7 watts. Watt (W): The SI unit of power, one joule per second.
Where horsepower to watts 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 Horsepower to Watts step by step
- Enter the value in hp (the starting unit).
- Multiply by 745.6999, because 1 hp = 745.6999 W.
- The product is the value in W. To go back, divide by 745.6999 or multiply by 0.001341022.
Popular power conversions
How to read your Horsepower to Watts result
Quick estimate: multiply by about 750 to get watts from horsepower; this is within 0.6% of the exact factor. Power is energy per time.
| HORSEPOWER | WATTS |
|---|---|
| 1 | 745.6999 |
| 2 | 1,491.4 |
| 5 | 3,728.499 |
| 10 | 7,456.999 |
| 20 | 14,914 |
| 50 | 37,284.99 |
| 100 | 74,569.99 |
| 1,000 | 745,699.9 |
Watts to Horsepower: quick table
| WATTS | HORSEPOWER |
|---|---|
| 1 | 0.001341022 |
| 5 | 0.00670511 |
| 10 | 0.01341022 |
| 25 | 0.03352555 |
| 50 | 0.0670511 |
| 100 | 0.1341022 |
| 250 | 0.3352555 |
| 500 | 0.670511 |
Common mistakes when calculating Horsepower to Watts
- Assuming all horsepower figures are the same: mechanical hp is about 1.4% larger than metric PS.
- Dividing when you should multiply: from hp to W multiply by 745.6999; from W to hp divide by 745.6999.
Horsepower to Watts FAQ
How many W are in 1 hp?
1 hp equals 745.6999 W.
How many hp are in 1 W?
1 W equals 0.001341022 hp.
Is 1 hp = 745.6999 W an exact conversion?
The factor is shown rounded to 7 significant figures (745.6999). The calculator above uses more digits.
What is a watt (W)?
The SI unit of power, one joule per second.
How can I estimate horsepower to watts in my head?
Quick estimate: multiply by about 750 to get watts from horsepower; this is within 0.6% of the exact factor.
What is 15 hp in watts?
15 hp = 11,185.5 W (since 15 × 745.6999).
What is 75 hp in watts?
75 hp = 55,927.49 W (since 75 × 745.6999).
What is 300 hp in watts?
300 hp = 223,710 W (since 300 × 745.6999).
How many decimals should I keep when converting hp to W?
Match the precision of your original measurement. For example, 7,456.999 W rounds to 7,460 W at 3 significant figures; keep more digits only for engineering or scientific work.
More in Power converters
- kW to MW Converter
- Horsepower to kW Converter
- kW to PS Converter
- Horsepower to BTU per Hour Converter
- kW to Watts Converter
- BTU per Hour to Watts 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