Convert Milliwatts to Electrical Horsepower
Convert Milliwatts (mW) to Electrical Horsepower (hp(E)) instantly and accurately.
Conversion Formula
hp(E) = mW × 1.340482574e-6
About Milliwatts
A milliwatt (mW) is 10⁻³ W - the power scale of consumer wireless communications. Wi-Fi access points transmit at 100 mW (20 dBm); mobile phones peak at up to 1,000 mW. A laser pointer emits 1-5 mW; an LED indicator 10 mW; Bluetooth Classic peaks at 100 mW. Standby power implications: 1 mW × 10⁹ devices × 1 year = 8,760 MWh - enough to power a small town, underscoring why milliwatt standby matters at scale. 1 mW = 10⁻³ W.
About Electrical Horsepower
The electrical horsepower (hp(E)) is defined as exactly 746 W - the US NEMA rounding used on electric motor nameplates. It differs from mechanical hp (745.7 W) by only 0.04%. Every NEMA-rated motor in the US carries a horsepower nameplate: a '5 hp motor' delivers 5 × 746 = 3,730 W. NEC motor branch-circuit sizing tables, overload relay selection, and starter ratings are all based on hp(E). Despite global kW adoption, US industrial motor infrastructure remains standardised in electrical horsepower. 1 hp(E) = 746 W.
Quick Reference Table
| Milliwatts (mW) | Electrical Horsepower (hp(E)) |
|---|---|
| 1 mW | 1.34 × 10-6 hp(E) |
| 2 mW | 2.681 × 10-6 hp(E) |
| 5 mW | 6.702 × 10-6 hp(E) |
| 10 mW | 1.34 × 10-5 hp(E) |
| 25 mW | 3.351 × 10-5 hp(E) |
| 50 mW | 6.702 × 10-5 hp(E) |
| 100 mW | 0.000134048 hp(E) |