Horsepower to Watt Converter
Enter the value that you want to convert horsepower (hp) to watt (W) or watt to horsepower.Also written as HP to W conversion.
1 horsepower = 745.6998716 watt
Formula: watt = horsepower value × 745.6998716
HP to W — horsepower to watt
10 horsepower = 7456.99872 watt
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Converting Horsepower to Watt
The Horsepower in Engineering
Horsepower (hp) is a unit of power measurement. 1 horsepower is equal to 745.6998716 watt.
About the Watt
Watt (W) is a unit of power measurement. 1 watt is equal to 0.0013410 horsepower.
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.
horsepower to watt metric conversion table
| 0.01 hp | = | 7.45700 W |
| 0.1 hp | = | 74.56999 W |
| 1 hp | = | 745.69987 W |
| 2 hp | = | 1491.39974 W |
| 3 hp | = | 2237.09961 W |
| 4 hp | = | 2982.79949 W |
| 5 hp | = | 3728.49936 W |
| 6 hp | = | 4474.19923 W |
| 7 hp | = | 5219.89910 W |
| 8 hp | = | 5965.59897 W |
| 9 hp | = | 6711.29884 W |
| 10 hp | = | 7456.99872 W |
| 11 hp | = | 8202.69859 W |
| 12 hp | = | 8948.39846 W |
| 13 hp | = | 9694.09833 W |
| 14 hp | = | 10439.79820 W |
| 15 hp | = | 11185.49807 W |
| 16 hp | = | 11931.19795 W |
| 17 hp | = | 12676.89782 W |
| 18 hp | = | 13422.59769 W |
| 19 hp | = | 14168.29756 W |
| 20 hp | = | 14913.99743 W |
| 30 hp | = | 22370.99615 W |
| 40 hp | = | 29827.99486 W |
| 50 hp | = | 37284.99358 W |
| 60 hp | = | 44741.99229 W |
| 70 hp | = | 52198.99101 W |
| 80 hp | = | 59655.98973 W |
| 90 hp | = | 67112.98844 W |
| 100 hp | = | 74569.98716 W |
| 200 hp | = | 149139.97432 W |
| 300 hp | = | 223709.96147 W |
| 400 hp | = | 298279.94863 W |
| 500 hp | = | 372849.93579 W |
| 600 hp | = | 447419.92295 W |
| 700 hp | = | 521989.91011 W |
| 800 hp | = | 596559.89726 W |
| 900 hp | = | 671129.88442 W |
| 1000 hp | = | 745699.87158 W |
How to Convert HP to W (Horsepower to Watt)?
We can convert horsepower to watt by using an example.
Example:
Convert 20 Horsepower to Watt?
We know 1 Horsepower = 745.6998716 watt; 1 Watt = 0.0013410 horsepower.
20 horsepower = ___W
20 × 745.6998716 = 14913.99743 W (we know 1 horsepower = 745.6998716 watt)
Answer:
20 horsepower = 14913.99743 watt
Horsepower to Watts: From Car Engines to Electric Motors
Horsepower remains the dominant power unit in automotive culture, but electrical specifications always use watts. One mechanical horsepower equals exactly 745.7 watts. Whether you are comparing a gasoline engine to an electric motor, sizing a generator, or calculating electrical load from a motor nameplate, this conversion is essential.
- Start with the power value in horsepower (hp).
- Multiply by 745.7 to get watts.
- For an approximate result, multiply by 746 (electrical hp definition).
- The result is the electrical power in watts.
Horsepower to Watts: Automotive and Motor Reference
Common horsepower ratings and their watt equivalents:
| Horsepower | Watt |
|---|---|
| 1/4 hp | 186.4 W |
| 1/2 hp | 372.8 W |
| 1 hp | 745.7 W |
| 5 hp | 3,728 W |
| 10 hp | 7,457 W |
| 100 hp | 74,570 W |
| 200 hp | 149,140 W |
| 400 hp | 298,280 W |
| 700 hp | 521,990 W |
Solved Examples: Horsepower to Watts
Question 1: A Ford Mustang GT produces 480 hp. What is that in watts?
Solution:
Watts = hp × 745.7
= 480 × 745.7
= 357,936 W
= 357.9 kW
Answer: 480 hp = 357,936 W (approximately 358 kW).
Question 2: A well pump is rated at 3/4 hp. Convert to watts.
Solution:
Watts = hp × 745.7
= 0.75 × 745.7
= 559.3 W
Answer: 3/4 hp = 559.3 W — important for generator sizing during power outages.
Question 3: A semi-truck engine produces 500 hp. Express in kilowatts.
Solution:
Watts = hp × 745.7
= 500 × 745.7
= 372,850 W
= 372.85 kW
Answer: 500 hp = 372,850 W = 372.85 kW.
Practice: Horsepower to Watts
Try solving these on your own to test your understanding:
- Convert 2 hp to watts. (Answer: 1,491.4 W)
- A lawn mower engine is 6.5 hp. What is that in watts? (Answer: 4,847 W)
- Convert 150 hp to watts. (Answer: 111,855 W)
- A boat motor is 250 hp. Express in kW. (Answer: 186.4 kW)
- A ceiling fan motor is 1/3 hp. Convert to watts. (Answer: 248.6 W)
The Origin of Horsepower
James Watt defined horsepower in the 1780s while marketing his steam engines. He observed a mill horse could turn a 24-foot diameter mill wheel 2.5 times per minute, calculating the horse exerted about 33,000 foot-pounds per minute. This somewhat generous estimate (real horses average less) became the standard. Today, 1 hp = 33,000 ft·lbf/min = 550 ft·lbf/s = 745.7 watts.
Why EVs Use kW But Market in Horsepower
Electric vehicle motors are natively rated in watts or kilowatts since they consume electrical energy. But because consumers understand horsepower from decades of gasoline cars, manufacturers convert to hp for marketing. A Tesla Model S Plaid with 750 kW (1,006 hp) sounds more impressive in horsepower. However, EV torque delivery differs fundamentally from combustion engines — peak power is available almost instantly.
Key Takeaways
- 1 hp = 745.7 watts (mechanical/Imperial).
- Multiply horsepower by 745.7 to get watts.
- Quick estimate: 1 hp ≈ ¾ kW.
- Horsepower was defined by James Watt as 33,000 ft·lbf/min.
- EV motors are natively kW but marketed in hp for consumer familiarity.
Horsepower to Watt Conversion Formula
watt = horsepower × 745.6998716
1 horsepower = 745.6998716 watt
1 watt = 0.0013410 horsepower
Reverse: horsepower = watt × 0.0013410
Frequently Asked Questions
How many watt are in 1 horsepower?
There are 745.6998716 watt in 1 horsepower. To convert horsepower to watt, multiply the value by 745.6998716.
How do I convert horsepower to watt?
Multiply your horsepower value by 745.6998716 to get the equivalent in watt. For example, 5 horsepower = 5 × 745.6998716 = 3728.49936 watt.
How do I convert watt to horsepower?
Multiply your watt value by 0.0013410 to get the equivalent in horsepower. Alternatively, divide by 745.6998716.
What is 10 horsepower in watt?
10 horsepower is equal to 7456.99872 watt.
What is 100 horsepower in watt?
100 horsepower is equal to 74569.98716 watt.