Convert Watts to Horsepower
Instantly convert Watts (W) to Horsepower (hp) with our free online calculator.
Formula: W to hp — multiply by 0.00134102
Reference Table
| Watts (W) | Horsepower (hp) |
|---|---|
| 1 | 0.00134102 |
| 5 | 0.00670511 |
| 10 | 0.0134102 |
| 25 | 0.0335255 |
| 50 | 0.0670511 |
| 100 | 0.134102 |
How to Convert Watts to Horsepower
Formula
To convert Watts (W) to Horsepower (hp): multiply by 0.00134102
Step-by-Step
- Start with your value in Watts (W).
- Multiply by 0.00134102 to perform the conversion.
- The result is your value expressed in Horsepower (hp).
Conversion Factor
1 W = 0.00134102 hp
Reverse Factor
1 hp = 745.7 W
Worked Example
Convert 25 Watts to Horsepower: 25 W = 0.0335255 hp
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.
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.
Quick Facts
- 1 Watt equals 0.00134102 Horsepower
- 1 Horsepower equals 745.7 Watts
- Watt is a unit of power
- Horsepower is a unit of power
- This conversion is commonly used in electrical systems, automotive performance, and HVAC sizing
- The Watt belongs to the metric system
- The Horsepower belongs to the imperial system
Common Watt to Horsepower Conversions
| Watts (W) | Horsepower (hp) |
|---|---|
| 0.01 | 0.0000134102 |
| 0.1 | 0.000134102 |
| 0.25 | 0.000335255 |
| 0.5 | 0.000670511 |
| 1 | 0.00134102 |
| 2 | 0.00268204 |
| 3 | 0.00402307 |
| 5 | 0.00670511 |
| 10 | 0.0134102 |
| 15 | 0.0201153 |
| 20 | 0.0268204 |
| 25 | 0.0335255 |
| 50 | 0.0670511 |
| 75 | 0.100577 |
| 100 | 0.134102 |
| 250 | 0.335255 |
| 500 | 0.670511 |
| 1000 | 1.34102 |
| 5000 | 6.70511 |
| 10000 | 13.4102 |
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.
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.
Why Convert Watts to Horsepower?
Power conversions between Watts and Horsepower 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 Watts to Horsepower?
The SI unit of power, equal to one joule per second. To convert Watts to Horsepower, multiply by 0.00134102. For example, 25 W equals 0.0335255 hp.
How many Horsepower are in 1 Watt?
There are 0.00134102 Horsepower in 1 Watt.
How many Watts are in 1 Horsepower?
There are 745.7 Watts in 1 Horsepower.
What is the formula for Watt to Horsepower conversion?
The formula is: multiply by 0.00134102. This means 1 W = 0.00134102 hp.
Is a Watt bigger than a Horsepower?
Yes. One Watt is larger than one Horsepower because 1 W equals 0.00134102 hp, which is less than 1.
When do you need to convert between Watts and Horsepower?
An imperial unit of power equal to approximately 745. Watt and Horsepower 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.