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 = 746.0000000 watt
Formula: watt = horsepower value × 746.0000000
HP to W — horsepower to watt
10 horsepower = 7460.00000 watt
Popular Power Converters:
Horsepower vs Watt
The Horsepower in Engineering
Horsepower (hp) is a unit of power measurement. 1 horsepower is equal to 746.0000000 watt.
About the Watt
Watt (W) is a unit of power measurement. 1 watt is equal to 0.0013405 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 | = | 7.46000 W |
| 0.1 hp | = | 74.60000 W |
| 1 hp | = | 746.00000 W |
| 2 hp | = | 1492.00000 W |
| 3 hp | = | 2238.00000 W |
| 4 hp | = | 2984.00000 W |
| 5 hp | = | 3730.00000 W |
| 6 hp | = | 4476.00000 W |
| 7 hp | = | 5222.00000 W |
| 8 hp | = | 5968.00000 W |
| 9 hp | = | 6714.00000 W |
| 10 hp | = | 7460.00000 W |
| 11 hp | = | 8206.00000 W |
| 12 hp | = | 8952.00000 W |
| 13 hp | = | 9698.00000 W |
| 14 hp | = | 10444.00000 W |
| 15 hp | = | 11190.00000 W |
| 16 hp | = | 11936.00000 W |
| 17 hp | = | 12682.00000 W |
| 18 hp | = | 13428.00000 W |
| 19 hp | = | 14174.00000 W |
| 20 hp | = | 14920.00000 W |
| 30 hp | = | 22380.00000 W |
| 40 hp | = | 29840.00000 W |
| 50 hp | = | 37300.00000 W |
| 60 hp | = | 44760.00000 W |
| 70 hp | = | 52220.00000 W |
| 80 hp | = | 59680.00000 W |
| 90 hp | = | 67140.00000 W |
| 100 hp | = | 74600.00000 W |
| 200 hp | = | 149200.00000 W |
| 300 hp | = | 223800.00000 W |
| 400 hp | = | 298400.00000 W |
| 500 hp | = | 373000.00000 W |
| 600 hp | = | 447600.00000 W |
| 700 hp | = | 522200.00000 W |
| 800 hp | = | 596800.00000 W |
| 900 hp | = | 671400.00000 W |
| 1000 hp | = | 746000.00000 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 = 746.0000000 watt; 1 Watt = 0.0013405 horsepower.
20 horsepower = ___W
20 × 746.0000000 = 14920.00000 W (we know 1 horsepower = 746.0000000 watt)
Answer:
20 horsepower = 14920.00000 watt
Electric Horsepower to Watts: Motor Nameplate Conversions
Electric horsepower is a slightly rounded definition used specifically for electric motor ratings: 1 electric hp = exactly 746 watts. This differs from mechanical horsepower (745.7 W) by only 0.04% — a rounding for convenience. For all practical motor calculations (amperage, wire sizing, breaker selection), 746 W per hp is the standard used by NEC (National Electrical Code).
- Start with the electric motor rating in horsepower.
- Multiply by 746 to get watts.
- For kilowatts: multiply hp by 0.746.
- The result is the electrical power in watts.
Electric HP to Watts: Motor Nameplate Reference
Standard NEMA motor sizes and their watt equivalents:
| Horsepower | Watt |
|---|---|
| 1/6 hp | 124.3 W |
| 1/4 hp | 186.5 W |
| 1/3 hp | 248.7 W |
| 1/2 hp | 373 W |
| 3/4 hp | 559.5 W |
| 1 hp | 746 W |
| 2 hp | 1,492 W |
| 5 hp | 3,730 W |
| 10 hp | 7,460 W |
| 25 hp | 18,650 W |
Solved Examples: Electric HP to Watts
Question 1: A workshop dust collector has a 2 hp motor. What is its watt rating?
Solution:
Watts = hp × 746
= 2 × 746
= 1,492 W
Answer: 2 hp = 1,492 W. At 240V and 80% efficiency, it draws about 7.8 amps.
Question 2: A commercial kitchen exhaust fan has a 3/4 hp motor. Express in watts.
Solution:
Watts = hp × 746
= 0.75 × 746
= 559.5 W
Answer: 3/4 hp = 559.5 W — typically on a 120V, 15A circuit.
Question 3: A 50 hp industrial motor drives a large pump. Convert to watts and kW.
Solution:
Watts = hp × 746
= 50 × 746
= 37,300 W
= 37.3 kW
Answer: 50 hp = 37,300 W = 37.3 kW electrical rating.
Practice: Electric HP to Watts
Try solving these on your own to test your understanding:
- Convert 1/3 hp to watts. (Answer: 248.7 W)
- A pool pump motor is 1.5 hp. What is that in watts? (Answer: 1,119 W)
- Convert 7.5 hp to watts. (Answer: 5,595 W)
- A conveyor motor is 3 hp. Express in watts. (Answer: 2,238 W)
- A large compressor motor is 30 hp. Convert to kW. (Answer: 22.38 kW)
Motor Efficiency: Nameplate HP vs. Electrical Draw
A motor rated 5 hp (3,730 W) output actually draws MORE than 3,730 W from the wall because no motor is 100% efficient. A standard efficiency motor at 85% efficiency draws 3,730 ÷ 0.85 = 4,388 W. Premium efficiency (NEMA Premium) motors reach 90-95% efficiency: 3,730 ÷ 0.93 = 4,011 W. Always account for efficiency when calculating electrical load and energy costs.
746 vs. 745.7: Why Electric HP Uses the Rounded Value
The International Electrotechnical Commission (IEC) and IEEE define electric horsepower as exactly 746 watts for simplicity in electrical calculations. The 0.3 W difference from mechanical hp (745.7 W) is negligible — less than 0.04%. All US electrical code calculations, motor full-load current tables, and conductor sizing references use 746 W. You will never encounter a practical situation where this 0.04% matters.
Key Takeaways
- 1 electric hp = 746 watts exactly.
- Used by NEC and electrical codes for motor circuit calculations.
- Differs from mechanical hp (745.7 W) by only 0.04% — negligible.
- Motor electrical draw = hp × 746 ÷ efficiency.
- Standard NEMA motor sizes: 1/6, 1/4, 1/3, 1/2, 3/4, 1, 1.5, 2, 3, 5, 7.5, 10 hp.
Horsepower to Watt Conversion Formula
watt = horsepower × 746.0000000
1 horsepower = 746.0000000 watt
1 watt = 0.0013405 horsepower
Reverse: horsepower = watt × 0.0013405
Frequently Asked Questions
How many watt are in 1 horsepower?
There are 746.0000000 watt in 1 horsepower. To convert horsepower to watt, multiply the value by 746.0000000.
How do I convert horsepower to watt?
Multiply your horsepower value by 746.0000000 to get the equivalent in watt. For example, 5 horsepower = 5 × 746.0000000 = 3730.00000 watt.
How do I convert watt to horsepower?
Multiply your watt value by 0.0013405 to get the equivalent in horsepower. Alternatively, divide by 746.0000000.
What is 10 horsepower in watt?
10 horsepower is equal to 7460.00000 watt.
What is 100 horsepower in watt?
100 horsepower is equal to 74600.00000 watt.