Watts to Horsepower Converter
Enter the power in watts below to convert it to horsepower.
Convert Watts to Horsepower (hp)
Enter a value in watts (W) to convert to horsepower (hp) (hp).
Watt to Horsepower Conversion Table
Table showing various watt measurements converted to horsepower. Click any preset value or arrow to load it into the converter.
| Watts (W) | Horsepower (hp) (hp) |
|---|---|
| 1 W | 0.001341 hp |
| 2 W | 0.002682 hp |
| 5 W | 0.0067051 hp |
| 10 W | 0.0134102 hp |
| 15 W | 0.0201153 hp |
| 20 W | 0.0268204 hp |
| 25 W | 0.0335256 hp |
| 30 W | 0.0402307 hp |
| 50 W | 0.0670511 hp |
| 75 W | 0.1005767 hp |
How to Convert Watts to Horsepower
To convert watts to horsepower, multiply the power by the following conversion ratio: 0.001341 horsepower/watt.
Since one watt is equal to 0.001341 horsepower, you can use this simple formula to convert:
The power in horsepower is equal to the power in watts multiplied by 0.001341.
For example, here's how to convert 750 watts to horsepower using the formula above.
How Many Horsepower Are in a Watt?
There are 0.001341 horsepower in a watt, which is why we use this value in the formula above.
Our watt to horsepower calculator automatically converts your power measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Watts and horsepower are both units used to measure power. Keep reading to learn more about each unit.
What Is a Watt?
Coherent SI unit of power equal to 1 Joule per second (1 J/s). It serves as a primary reference unit for measuring power across scientific and practical applications. [1]
The watt is classified as an International System of Units (SI) unit of power. Watts can be abbreviated as W; for example, 1 watt can be written as 1 W.
As the primary coherent reference unit for power in this category, all other power units are mathematically anchored to the watt (W).
In practice, watts (W) are widely used across standard power applications within International System of Units (SI) workflows, engineering documentation, and technical data sheets.
What Is a Horsepower?
A horsepower is a unit of power equal to 745.6998716 watts (W), the base unit for power. Imperial mechanical horsepower (550 ft·lbf/s ≈ 745.7 W). [2]
The horsepower is classified as a US customary and imperial unit of power. Horsepower can be abbreviated as hp; for example, 1 horsepower can be written as 1 hp.
When working with horsepower (hp) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.
In practice, horsepower (hp) are widely used across standard power applications within US customary and imperial workflows, engineering documentation, and technical data sheets.
When converting power between watts (W) and horsepower (hp), keep full floating-point precision (1 W = 0.001341 hp; 1 hp = 745.6998716 W) during intermediate calculations and round only the final horsepower figure to match your instrument tolerance.
More Watt & Horsepower Conversions
Need to calculate in the opposite direction? Use our horsepower (hp) to watts converter (hp to W) to switch your starting unit immediately. You can also explore related tools such as converting kilowatts to horsepower (hp), converting metric horsepower to horsepower (hp), or converting watts to kilowatts.
Frequently Asked Questions
References
- [1]NIST SP 811 StandardNIST SP 811 (NIST SP 811 App. B.9 (Power & Radiant Flux))·Power Metrology Standard — Watts (W) to Horsepower (hp) (hp)
- [2]NIST CUU SpecificationNIST CUU (Derived SI Unit: Watt (W))·Unit Specifications: Watt (W) & Horsepower (Mechanical) (hp)
- [3]BIPM ReferenceBIPM (SI Brochure (9th Ed.) — Power)·Conversion Factors & Mathematical Basis (W to hp)