Horsepower (Mech) to Milliwatt Converter

Power Converter

22 units available

Decimals:

From

To

745,699.871582

1 hp = 745,699.871582 mW

Formula:

mW = hp × 745,699.87158227

With your value: 1 hp = 745,699.87158227 mW

How big is that?

Everyday references on a logarithmic scale, all expressed in horsepower (mech) so you can sanity-check the result.

LED bulb (1/83 your value)0.0121 hp

Laptop (1/11 your value)0.0872 hp

Your value1.00 hp

Microwave oven (1.3× your value)1.34 hp

Electric kettle (4.0× your value)4.02 hp

Family car engine (1.2e+2× your value)121 hp

Other Horsepower (Mech) to Milliwatt conversions

2 hp to mW 3 hp to mW 4 hp to mW 5 hp to mW 6 hp to mW 7 hp to mW 8 hp to mW

Horsepower (Mech) to Milliwatt Conversion Table

Horsepower (Mech) (hp)	Milliwatt (mW)
0.5	372,849.935791
1	745,699.871582
2	1,491,399.743165
5	3,728,499.357911
10	7,456,998.715823
15	11,185,498.073734
20	14,913,997.431645
25	18,642,496.789557
50	37,284,993.579114
100	74,569,987.158227
250	186,424,967.895568
500	372,849,935.791135
1000	745,699,871.58227

Milliwatt to Horsepower (Mech) Conversion Table

Milliwatt (mW)	Horsepower (Mech) (hp)
0.5	6.705110e-7
1	1.341022e-6
2	2.682044e-6
5	6.705110e-6
10	1.341022e-5
15	2.011533e-5
20	2.682044e-5
25	3.352555e-5
50	6.705110e-5
100	0.000134
250	0.000335
500	0.000671
1000	0.001341

Where these values come from

Every factor on this page is traced to the document that defines it. See the full provenance dataset or our methodology.

Horsepower (Mech) (hp)

Power

Exact conversion

Mechanical horsepower is exactly 550 ft·lbf/s = 745.699 871 582 270 22 W.

Metric horsepower (PS) is 735.498 75 W — about 1.4 % lower.

Source: NIST Special Publication 811, Guide for the Use of the International System of Units

National Institute of Standards and Technology (US) · Reviewed 2026-07-01

Milliwatt (mW)

Power

Exact conversion

Derived from the watt (1 W = 1 J/s).

Source: NIST Special Publication 811, Guide for the Use of the International System of Units

National Institute of Standards and Technology (US) · Reviewed 2026-07-01

How to Convert Horsepower (Mech) to Milliwatt

To convert from Horsepower (Mech) (hp) to Milliwatt (mW), multiply the value by 745,699.87158227.

Formula: mW = hp × 745,699.87158227

Reverse: hp = mW × 0.000001341

Step-by-Step Example

Start with your value in Horsepower (Mech). For example: 5 hp
Multiply by the conversion factor: 5 x 745,699.87158227
The result is: 3,728,499.357911 mW

About Horsepower (Mech)

The horsepower (mech) (hp) is a unit of power. One horsepower (mech) equals 745.6998716 watts. UnitConvertLab converts it against every other power unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.

Common uses: power calculations, engineering and science, education.

About Milliwatt

The milliwatt (mW) is a unit of power. One milliwatt equals 0.001 watts. UnitConvertLab converts it against every other power unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.

Common uses: power calculations, engineering and science, education.

Frequently Asked Questions

How many Milliwatt are in 1 Horsepower (Mech)?

There are exactly 745,699.87158227 Milliwatt in 1 Horsepower (Mech). This means the conversion factor from Horsepower (Mech) to Milliwatt is 745,699.87158227.

What is the formula to convert Horsepower (Mech) to Milliwatt?

The formula to convert Horsepower (Mech) to Milliwatt is: mW = hp × 745,699.87158227. For example, to convert 10 Horsepower (Mech) to Milliwatt, you would multiply 10 by 745,699.87158227.

What is a Horsepower (Mech)?