Horsepower to Milliwatts Converter
Enter a value to instantly convert between power units.
1 Horsepower (mech) = 745699.8716 Milliwatt
Key Formulas
Kilowatt → Horsepower (mech)
hp = kW × 1.34102Horsepower (mech) → Kilowatt
kW = hp × 0.7457Watt → Kilowatt
kW = W × 0.001Kilowatt → Watt
W = kW × 1000Formula
mW = hp × 745,699.87Small fractional-horsepower motors are common in appliances, fans, and hobby robotics — and are sometimes rated in tiny fractions of hp while electronics nearby are rated in milliwatts. A 1/100 hp fan motor draws about 7,457 mW = 7.46 W, which is directly comparable to electronic component power budgets. This conversion bridges traditional mechanical ratings and modern electronic specifications.
Source: NIST SP 811, Table B.8
Last reviewed: · see our methodology
Frequently Asked Questions
Real-World Examples
A tiny 0.001 hp (1 millihorsepower) miniature motor = 745.7 mW — comparable to a bright LED in power consumption.
0.001 hp = 745.7 mW
A 0.01 hp clock motor or small fan = 7,457 mW = 7.5 W — typical for a small desktop fan on low speed.
0.01 hp = 7457 mW
A 0.1 hp appliance motor (range hood fan) = 74,570 mW = 74.6 W — found in small kitchen exhaust fans.
0.1 hp = 74570 mW
A 1 hp motor = 745,700 mW = 745.7 W — the standard reference point for mechanical power conversion.
1 hp = 745700 mW