Horsepower (mechanical) to Milliwatt Converter
Power · unit-converter
Convert Horsepower (mechanical) to Milliwatt with a fixed input and output unit, step-by-step formula line, and reference tables. Linear units use SI watt definitions; mechanical hp uses 550 ft·lbf/s; BTU/h uses the IT BTU; dBm/dBW are logarithmic relative to 1 mW and 1 W. The full Power Converter also includes PS/CV, TR, kVA/MVA, and ft·lb/s.
Calculator
From: Horsepower (mechanical) (hp)
To: Milliwatt (mw)
About Horsepower (mechanical)
Mechanical horsepower here is the US definition: 550 ft·lbf/s ≈ 745.70 W. Automotive and industrial specs often cite hp.
About Milliwatt
One milliwatt is one thousandth of a watt. Common in RF, fiber optics, and low-power electronics.
How to convert horsepower (mechanical, 550 ft·lb/s) to milliwatts
1 horsepower (mechanical) is equal to 745699.87158227025066 milliwatt when both are expressed in watt-equivalents:
1 hp = (745.6998715822702 W ÷ 0.001 W) mw = 745699.87158227025066 mw
Each horsepower (mechanical) is defined as 745.6998715822702 W and each milliwatt as 0.001 W in this tool, so one hp equals 745.6998715822702 ÷ 0.001 mw = 745699.87158227025066 mw.
Let d(hp) be the numeric value in Horsepower (mechanical) (hp), and d(mw) the value in Milliwatt (mw). Then:
d(mw) = d(hp) × (745.6998715822702 / 0.001)
Equivalently, divide by how many hp fit into one mw (watts per mw divided by watts per hp):
d(mw) = d(hp) ÷ 0.00000134102209
Or: milliwatt = horsepower (mechanical) ÷ 0.00000134102209
Examples
Example #1: Convert 1 hp to milliwatt
1 hp = 1 hp × (745.6998715822702/0.001) mw = 745699.8715820001 mw
1 hp = 1 hp ÷ 0.00000134102209 = 745699.8715820001 mw
Intermediate watts: 745.699871582 W
Example #2: Convert 10 hp to milliwatt
10 hp = 10 hp × (745.6998715822702/0.001) mw = 7456998.7158199996 mw
10 hp = 10 hp ÷ 0.00000134102209 = 7456998.7158199996 mw
Intermediate watts: 7,456.99871582 W
Summary
To convert Horsepower (mechanical) to Milliwatt, multiply the value in hp by the ratio of watts per hp divided by watts per mw. Equivalently: value_mw = value_hp × (745.6998715822702 / 0.001). Numerically, 1 hp equals 745699.8715822703 mw.
Relationship context
You are converting between mechanical power (horsepower, ft·lb/s) (Horsepower (mechanical, 550 ft·lb/s)) and SI / decimal power (watts and prefixes) (Milliwatts). All linear values are mapped through watts first. The numeric factor is 7.456999e+5.
Conversion tables
| Horsepower (mechanical) (hp) | Milliwatt (mw) |
|---|---|
| 0.1 | 74,569.9871582 |
| 1 | 745,699.8715820001 |
| 2 | 1,491,399.7431600001 |
| 3 | 2,237,099.6147500002 |
| 4 | 2,982,799.4863300002 |
| 5 | 3,728,499.3579099998 |
| 6 | 4,474,199.2294899998 |
| 7 | 5,219,899.1010800004 |
| 8 | 5,965,598.9726600004 |
| 9 | 6,711,298.8442399995 |
| Horsepower (mechanical) (hp) | Milliwatt (mw) |
|---|---|
| 10 | 7,456,998.7158199996 |
| 20 | 14,913,997.4316000007 |
| 30 | 22,370,996.1475000009 |
| 40 | 29,827,994.8632999994 |
| 50 | 37,284,993.5790999979 |
| 60 | 44,741,992.2949000001 |
| 70 | 52,198,991.0107999966 |
| 80 | 59,655,989.7265999988 |
| 90 | 67,112,988.4423999935 |
| 100 | 74,569,987.1581999958 |