Watt to Horsepower Converter
Enter the value that you want to convert watt (W) to horsepower (hp) or horsepower to watt.Also written as W to HP conversion.
1 watt = 0.0013410 horsepower
Formula: horsepower = watt value × 0.0013410
W to HP — watt to horsepower
10 watt = 0.01341 horsepower
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Watt to Horsepower: The Essentials
About the Watt
Watt (W) is a unit of power measurement. 1 watt is equal to 0.0013410 horsepower.
The Horsepower in Engineering
Horsepower (hp) is a unit of power measurement. 1 horsepower is equal to 745.6998716 watt.
Power Measurement Across Applications
Power units span from milliwatts in electronics to megawatts in power plants. Engine output is still quoted in horsepower (mechanical, metric, and electrical — all slightly different). HVAC systems rate cooling in tons of refrigeration or BTU/hour. Solar panels specify watts peak. Electric motors list watts or kilowatts. Each industry carries its historical unit preferences, making conversion between them a daily necessity.
watt to horsepower metric conversion table
| 0.01 W | = | 0.00001 hp |
| 0.1 W | = | 0.00013 hp |
| 1 W | = | 0.00134 hp |
| 2 W | = | 0.00268 hp |
| 3 W | = | 0.00402 hp |
| 4 W | = | 0.00536 hp |
| 5 W | = | 0.00671 hp |
| 6 W | = | 0.00805 hp |
| 7 W | = | 0.00939 hp |
| 8 W | = | 0.01073 hp |
| 9 W | = | 0.01207 hp |
| 10 W | = | 0.01341 hp |
| 11 W | = | 0.01475 hp |
| 12 W | = | 0.01609 hp |
| 13 W | = | 0.01743 hp |
| 14 W | = | 0.01877 hp |
| 15 W | = | 0.02012 hp |
| 16 W | = | 0.02146 hp |
| 17 W | = | 0.02280 hp |
| 18 W | = | 0.02414 hp |
| 19 W | = | 0.02548 hp |
| 20 W | = | 0.02682 hp |
| 30 W | = | 0.04023 hp |
| 40 W | = | 0.05364 hp |
| 50 W | = | 0.06705 hp |
| 60 W | = | 0.08046 hp |
| 70 W | = | 0.09387 hp |
| 80 W | = | 0.10728 hp |
| 90 W | = | 0.12069 hp |
| 100 W | = | 0.13410 hp |
| 200 W | = | 0.26820 hp |
| 300 W | = | 0.40231 hp |
| 400 W | = | 0.53641 hp |
| 500 W | = | 0.67051 hp |
| 600 W | = | 0.80461 hp |
| 700 W | = | 0.93872 hp |
| 800 W | = | 1.07282 hp |
| 900 W | = | 1.20692 hp |
| 1000 W | = | 1.34102 hp |
How to Convert W to HP (Watt to Horsepower)?
We can convert watt to horsepower by using an example.
Example:
Convert 20 Watt to Horsepower?
We know 1 Watt = 0.0013410 horsepower; 1 Horsepower = 745.6998716 watt.
20 watt = ___hp
20 × 0.0013410 = 0.02682 hp (we know 1 watt = 0.0013410 horsepower)
Answer:
20 watt = 0.02682 horsepower
How to Convert Watts to Horsepower (Mechanical)
Watts and horsepower are both units of power, but they come from very different eras. The watt is the SI unit named after James Watt, while horsepower was coined to compare steam engines to draft horses. One mechanical horsepower equals 745.7 watts, so to convert watts to horsepower you divide by 745.7 (or equivalently multiply by 0.001341).
- Start with the power value in watts (W).
- Divide the watt value by 745.7.
- Alternatively, multiply by 0.001341.
- The result is the power expressed in mechanical horsepower (hp).
Watts to Horsepower Reference Table
Typical power ratings you will encounter in motors, appliances, and vehicles:
| Watt | Horsepower |
|---|---|
| 100 W | 0.134 hp |
| 250 W | 0.335 hp |
| 500 W | 0.671 hp |
| 745.7 W | 1.000 hp |
| 1,500 W | 2.011 hp |
| 3,000 W | 4.023 hp |
| 5,000 W | 6.705 hp |
| 10,000 W | 13.41 hp |
Solved Examples: Watts to Horsepower
Question 1: An electric scooter motor is rated at 2,000 W. What is its horsepower?
Solution:
hp = watts ÷ 745.7
= 2,000 ÷ 745.7
= 2.682 hp
Answer: 2,000 W = 2.682 hp — typical for a commuter electric scooter.
Question 2: A workshop dust collector has a 1,100 W motor. Express in horsepower.
Solution:
hp = watts ÷ 745.7
= 1,100 ÷ 745.7
= 1.475 hp
Answer: 1,100 W = 1.475 hp, often marketed as a "1.5 hp" unit.
Question 3: A solar panel array produces 6,200 W peak. How many horsepower equivalent?
Solution:
hp = watts ÷ 745.7
= 6,200 ÷ 745.7
= 8.314 hp
Answer: 6,200 W peak solar = 8.314 hp equivalent output.
Practice Problems: Watts to Horsepower
Try solving these on your own to test your understanding:
- Convert 375 W to horsepower. (Answer: 0.503 hp)
- A pool pump uses 1,865 W. What is its hp rating? (Answer: 2.501 hp)
- Convert 7,500 W to hp. (Answer: 10.06 hp)
- An electric lawn mower is rated at 1,400 W. Express in hp. (Answer: 1.878 hp)
- A blender motor uses 600 W. What is that in hp? (Answer: 0.805 hp)
Why Motor Nameplates Round Horsepower
Manufacturers often round motor ratings to the nearest standard hp size (1/4, 1/3, 1/2, 3/4, 1, 1.5, 2, 3, 5 hp). A motor labeled "1.5 hp" may actually draw 1,100 W (1.475 hp) or 1,200 W (1.609 hp). The nameplate hp reflects peak output under specific test conditions, not continuous running watts. Always check the watt rating for accurate energy cost calculations.
Mechanical vs. Electrical Horsepower
Mechanical (Imperial) horsepower uses 745.7 W per hp. Electrical horsepower, defined as exactly 746 W, is essentially the same value rounded for convenience. Metric horsepower (PS) uses 735.5 W. When converting watts to hp for automotive or industrial purposes, the mechanical definition (745.7 W) is the most widely used in the United States and UK.
Key Takeaways
- 1 watt = 0.001341 mechanical horsepower.
- Divide watts by 745.7 to get horsepower.
- Quick estimate: 750 W ≈ 1 hp (within 0.6% accuracy).
- Motor nameplates often round to standard hp sizes.
- Mechanical hp (745.7 W) is the most common definition in the US.
Watt to Horsepower Conversion Formula
horsepower = watt × 0.0013410
1 watt = 0.0013410 horsepower
1 horsepower = 745.6998716 watt
Reverse: watt = horsepower × 745.6998716
Frequently Asked Questions
How many horsepower are in 1 watt?
There are 0.0013410 horsepower in 1 watt. To convert watt to horsepower, multiply the value by 0.0013410.
How do I convert watt to horsepower?
Multiply your watt value by 0.0013410 to get the equivalent in horsepower. For example, 5 watt = 5 × 0.0013410 = 0.00671 horsepower.
How do I convert horsepower to watt?
Multiply your horsepower value by 745.6998716 to get the equivalent in watt. Alternatively, divide by 0.0013410.
What is 10 watt in horsepower?
10 watt is equal to 0.01341 horsepower.
What is 100 watt in horsepower?
100 watt is equal to 0.13410 horsepower.