Milliwatts to Horsepower Converter
Enter the power in milliwatts below to convert it to horsepower.
Convert Milliwatts to Horsepower (hp)
Enter a value in milliwatts (mW) to convert to horsepower (hp) (hp).
Milliwatt to Horsepower Conversion Table
Table showing various milliwatt measurements converted to horsepower. Click any preset value or arrow to load it into the converter.
| Milliwatts (mW) | Horsepower (hp) (hp) |
|---|---|
| 1 mW | 0.000001341 hp |
| 10 mW | 0.00001341 hp |
| 100 mW | 0.000134102 hp |
| 1,000 mW | 0.001341 hp |
| 10,000 mW | 0.0134102 hp |
| 100,000 mW | 0.1341022 hp |
| 1,000,000 mW | 1.3410221 hp |
| 5,000,000 mW | 6.7051104 hp |
| 10,000,000 mW | 13.4102209 hp |
| 25,400,000 mW | 34.0619611 hp |
How to Convert Milliwatts to Horsepower
To convert milliwatts to horsepower, multiply the power by the following conversion ratio: 0.000001341 horsepower/milliwatt.
Since one milliwatt is equal to 0.000001341 horsepower, you can use this simple formula to convert:
The power in horsepower is equal to the power in milliwatts multiplied by 0.000001341.
For example, here's how to convert 5 milliwatts to horsepower using the formula above.
How Many Horsepower Are in a Milliwatt?
There are 0.000001341 horsepower in a milliwatt, which is why we use this value in the formula above.
Our milliwatt to horsepower calculator automatically converts your power measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Milliwatts and horsepower are both units used to measure power. Keep reading to learn more about each unit.
What Is a Milliwatt?
A milliwatt is a unit of power equal to 1/1,000 of a watt (0.001 W). One-thousandth of a Watt. [1]
The milliwatt is classified as a metric and SI-compatible unit of power. Milliwatts can be abbreviated as mW; for example, 1 milliwatt can be written as 1 mW.
In the metric system, "milli" is the standard SI prefix for thousandths, or 10⁻³. This makes the milliwatt (mW) a convenient decimal multiple of the watt (W).
In practice, milliwatts (mW) are widely used across fine-tolerance laboratory, analytical, and micro-scale power measurements within SI metric 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 milliwatts (mW) and horsepower (hp), keep full floating-point precision (1 mW = 0.000001341 hp; 1 hp = 745,699.8715823 mW) during intermediate calculations and round only the final horsepower figure to match your instrument tolerance.
More Milliwatt & Horsepower Conversions
Need to calculate in the opposite direction? Use our horsepower (hp) to milliwatts calculator to switch your starting unit immediately. You can also explore related tools such as converting horsepower (hp) to milliwatts, converting watts to horsepower (hp), or converting kilowatts to horsepower (hp).
Convert from Milliwatts
Frequently Asked Questions
References
- [1]NIST SP 811 StandardNIST SP 811 (NIST SP 811 App. B.9 (Power & Radiant Flux))·Power Metrology Standard — Milliwatts (mW) to Horsepower (hp) (hp)
- [2]NIST CUU SpecificationNIST CUU (Derived SI Unit: Watt (W))·Unit Specifications: Milliwatt (mW) & Horsepower (Mechanical) (hp)
- [3]BIPM ReferenceBIPM (SI Brochure (9th Ed.) — Power)·Conversion Factors & Mathematical Basis (mW to hp)