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Horsepower to Milliwatts Converter

Convert horsepower to milliwatts and back instantly with formula and common values.

hp

Milliwatts

31,319,400

mW

42 hp = 31,319,400 mW

mW = hp × 745,700

Horsepower to Milliwatts: 1 hp equals 745700 mW. To convert horsepower to milliwatts, multiply by 745700 (mW = hp × 745,700). For example, 10 hp = 7457000 mW.

How to Convert Horsepower to Milliwatts

To convert from horsepower to milliwatts, multiply the value by 745700. The conversion is linear, meaning doubling the input doubles the output.

Conversion Formula

  • Horsepower to Milliwatts: mW = hp × 745,700
  • Milliwatts to Horsepower: hp = mW ÷ 745,700

Horsepower to Milliwatts Conversion Chart

Horsepower (hp)Milliwatts (mW)
0.174570
0.25186425
0.5372850
1745700
21491400
32237100
53728500
107457000
2014914000
2518642500
5037285000
10074570000
250186425000
1000745700000

Understanding the Units

What is a Horsepower?

One mechanical horsepower equals exactly 745.6998715822702 watts; one metric horsepower equals exactly 735.49875 watts.

Defined by James Watt to compare steam engines to draft horses pulling weights.

Common contexts: automotive, small engines.

What is a Milliwatt?

A milliwatt equals one thousandth of a watt (10⁻³ W).

Common contexts: radio transmitters, lasers, electronics.

Real-World Reference Points

Item Horsepower (hp) Milliwatts (mW)
Riding lawnmower1813422600
Compact sedan150111855000
Sports car400298280000

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FAQ

How do I convert horsepower to milliwatts?

Multiply by 745,700. For example, 42 hp × 745,700 = 31,319,400 mW.

What is the formula for horsepower to milliwatts?

The formula is: mW = hp × 745,700.

How many milliwatts are in one horsepower?

One horsepower equals 745,700 milliwatts.

How many milliwatts are in 1 horsepower?

1 hp equals 745700 mW.

How do you convert horsepower to milliwatts?

Multiply the horsepower value by 745700. Formula: mW = hp × 745,700.

How many milliwatts are in 5 horsepower?

5 hp = 3728500 mW.

How do you convert milliwatts back to horsepower?

Use the inverse formula: hp = mW ÷ 745,700. For example, 1 mW = 1.34102e-6 hp.

What is the difference between Horsepower and Milliwatt?

One mechanical horsepower equals exactly 745.6998715822702 watts; one metric horsepower equals exactly 735.49875 watts. A milliwatt equals one thousandth of a watt (10⁻³ W).