Convert Horsepower to Watts
Instantly convert Horsepower (hp) to Watts (W) with our free online calculator.
Formula: hp to W — multiply by 745.7
Reference Table
| Horsepower (hp) | Watts (W) |
|---|---|
| 1 | 745.7 |
| 5 | 3728.5 |
| 10 | 7457 |
| 25 | 18642.5 |
| 50 | 37285 |
| 100 | 74570 |
How to Convert Horsepower to Watts
Formula
To convert Horsepower (hp) to Watts (W): multiply by 745.7
Step-by-Step
- Start with your value in Horsepower (hp).
- Multiply by 745.7 to perform the conversion.
- The result is your value expressed in Watts (W).
Conversion Factor
1 hp = 745.7 W
Reverse Factor
1 W = 0.00134102 hp
Worked Example
Convert 25 Horsepower to Watts: 25 hp = 18642.5 W
About Horsepower (hp)
An imperial unit of power equal to approximately 745.7 watts, originally defined by James Watt to compare steam-engine output to draft horses pulling coal. Horsepower remains the dominant US unit for car engines, outboard motors, tractors, lawn equipment, and HVAC blowers. A typical sedan has 150–300 hp; a Tesla Model S Plaid has ~1,000 hp. Metric horsepower (PS, CV) is slightly different at 735.5 W — a detail that matters when comparing US-spec vs European-spec engine ratings.
About Watt (W)
The SI unit of power, equal to one joule per second. Named after Scottish engineer James Watt, whose 18th-century steam-engine improvements made the unit conceptually possible. Watts are the universal electrical and mechanical power unit — lightbulb ratings (9W LED ≈ 60W incandescent equivalent), small-appliance input, audio equipment output (speakers, amplifiers), and solar panel output (~300–400 W peak per panel). Scientific and engineering literature quotes all power in watts.
Quick Facts
- 1 Horsepower equals 745.7 Watts
- 1 Watt equals 0.00134102 Horsepower
- Horsepower is a unit of power
- Watt is a unit of power
- This conversion is commonly used in electrical systems, automotive performance, and HVAC sizing
- The Horsepower belongs to the imperial system
- The Watt belongs to the metric system
Common Horsepower to Watt Conversions
| Horsepower (hp) | Watts (W) |
|---|---|
| 0.01 | 7.457 |
| 0.1 | 74.57 |
| 0.25 | 186.425 |
| 0.5 | 372.85 |
| 1 | 745.7 |
| 2 | 1491.4 |
| 3 | 2237.1 |
| 5 | 3728.5 |
| 10 | 7457 |
| 15 | 11185.5 |
| 20 | 14914 |
| 25 | 18642.5 |
| 50 | 37285 |
| 75 | 55927.5 |
| 100 | 74570 |
| 250 | 186425 |
| 500 | 372850 |
| 1000 | 745700 |
| 5000 | 3728500 |
| 10000 | 7457000 |
Understanding Horsepower
The Horsepower (symbol: hp) is a unit of power. An imperial unit of power equal to approximately 745.7 watts, originally defined by James Watt to compare steam-engine output to draft horses pulling coal. Horsepower remains the dominant US unit for car engines, outboard motors, tractors, lawn equipment, and HVAC blowers. A typical sedan has 150–300 hp; a Tesla Model S Plaid has ~1,000 hp. Metric horsepower (PS, CV) is slightly different at 735.5 W — a detail that matters when comparing US-spec vs European-spec engine ratings.
It belongs to the imperial measurement system.
Horsepower are commonly used in electrical systems, automotive performance, and HVAC sizing.
Understanding Watts
The Watt (symbol: W) is a unit of power. The SI unit of power, equal to one joule per second. Named after Scottish engineer James Watt, whose 18th-century steam-engine improvements made the unit conceptually possible. Watts are the universal electrical and mechanical power unit — lightbulb ratings (9W LED ≈ 60W incandescent equivalent), small-appliance input, audio equipment output (speakers, amplifiers), and solar panel output (~300–400 W peak per panel). Scientific and engineering literature quotes all power in watts.
It belongs to the metric measurement system.
Watts are commonly used in electrical systems, automotive performance, and HVAC sizing.
Why Convert Horsepower to Watts?
Power conversions between Horsepower and Watts are needed in electrical engineering, automotive performance comparison, and HVAC system design. Motor ratings, generator capacities, and appliance specifications are published in different power units depending on the manufacturer and region.
Frequently Asked Questions
How do I convert Horsepower to Watts?
An imperial unit of power equal to approximately 745. To convert Horsepower to Watts, multiply by 745.7. For example, 25 hp equals 18642.5 W.
How many Watts are in 1 Horsepower?
There are 745.7 Watts in 1 Horsepower.
How many Horsepower are in 1 Watt?
There are 0.00134102 Horsepower in 1 Watt.
What is the formula for Horsepower to Watt conversion?
The formula is: multiply by 745.7. This means 1 hp = 745.7 W.
Is a Horsepower bigger than a Watt?
No. One Horsepower is smaller than one Watt because 1 hp equals 745.7 W, which is greater than 1.
When do you need to convert between Horsepower and Watts?
The SI unit of power, equal to one joule per second. Horsepower and Watt are both power units, so conversion comes up whenever one source of information uses one unit and another uses the other — a classic cross-reference challenge in engineering, trade, travel, and everyday life.