Convert Electrical Horsepower to Milliwatts
Convert Electrical Horsepower (hp(E)) to Milliwatts (mW) instantly and accurately.
Conversion Formula
mW = hp(E) × 746000
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.
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.
Quick Reference Table
| Electrical Horsepower (hp(E)) | Milliwatts (mW) |
|---|---|
| 1 hp(E) | 746000 mW |
| 2 hp(E) | 1492000 mW |
| 5 hp(E) | 3730000 mW |
| 10 hp(E) | 7460000 mW |
| 25 hp(E) | 18650000 mW |
| 50 hp(E) | 37300000 mW |
| 100 hp(E) | 74600000 mW |