Convert Milliwatts to Horsepower
1 milliwatt (mW) equals 0.00000134102209 horsepower (hp).
1 mW = 0.00000134102209 hp
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk milliwatt to horsepower converter to paste a column from Excel.
How to Convert Milliwatt to Horsepower
- 1 mW = 0.00000134102209 hp
- 1 hp = 745699.8716 mW
- Example: convert 15 mW to hp: 15 mW = 15 × 0.00000134102209 hp = 0.00002011533134 hp
Reference conditions. hp: Mechanical (imperial) horsepower, 550 ft·lbf/s. Metric horsepower (PS) is about 1.4 % smaller.
Formula
hp = mW × 0.000001341022089595
or hp = mW ÷ 745699.8715823
Derivation from SI units:
- 1 mW = 10⁻³ W
- 1 hp = 550 ft·lbf/s = 745.69987158227 W
- 1 mW = 0.001 W ÷ 745.6998715823 W per hp = 0.000001341022089595 hp
Both units are defined exactly, so the factor is exact. Milliwatt definition: milliwatt; Horsepower definition: horsepower.
Worked examples
- A reading of 10 mW converts to 0.0000134102209 hp.
10 mW × 0.00000134102209 = 0.0000134102209 hp - A value of 200 mW is 0.0002682044179 hp.
200 mW × 0.00000134102209 = 0.0002682044179 hp
Milliwatt to Horsepower conversion table
| Milliwatts (mW) | Horsepower (hp) |
|---|---|
| 0.1 mW | 1.34102209 × 10⁻⁷ hp |
| 1 mW | 0.00000134102209 hp |
| 5 mW | 0.000006705110448 hp |
| 10 mW | 0.0000134102209 hp |
| 50 mW | 0.00006705110448 hp |
| 100 mW | 0.000134102209 hp |
| 200 mW | 0.0002682044179 hp |
| 500 mW | 0.0006705110448 hp |
| 1000 mW | 0.00134102209 hp |
Where it's used
Milliwatts are used for laser pointer and diode output, while horsepower appear in car and motorcycle engine power in the US and UK. Both measure power (energy per unit time), so the conversion is a fixed factor.
Milliwatt to other power units
| Conversion | 1 mW equals |
|---|---|
| milliwatt to watt | 0.001 W |
| milliwatt to kilowatt | 0.000001 kW |
| milliwatt to megawatt | 1 × 10⁻⁹ MW |
| milliwatt to horsepower | 0.00000134102209 hp |
| milliwatt to metric horsepower | 0.000001359621617 PS |
| milliwatt to BTU per hour | 0.003412141633 BTU/h |
| milliwatt to refrigeration ton | 2.843451361 × 10⁻⁷ TR |
| milliwatt to kilocalorie per hour | 0.0008598452279 kcal/h |
| milliwatt to foot-pound per second | 0.0007375621493 ft·lbf/s |
Frequently asked questions
How many horsepower are in 1 milliwatt?
1 mW = 0.00000134102209 hp.
How do I convert milliwatts to horsepower?
Multiply the value in mW by 0.00000134102209, or divide it by 745699.8716. For example, 15 mW × 0.00000134102209 = 0.00002011533134 hp.
Is the mW to hp conversion exact?
Yes. Both units are defined exactly, so the ratio is exact; its decimal form does not terminate and is shown here to 10 significant figures (more with the precision selector).
Sources
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 7, SI prefixes.
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "horsepower (550 ft·lbf/s)".
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Convert Milliwatts to Horsepower. Retrieved October 17, 2026, from https://scientificconverters.com/power/milliwatts-to-horsepower/
IEEE
Scientific Converters, "Convert Milliwatts to Horsepower," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/power/milliwatts-to-horsepower/