Convert Metric horsepower to Milliwatts
1 metric horsepower is 735,498.75 mW. One metric horsepower is exactly 735498.75 milliwatts.
One metric horsepower is 735498.75 milliwatts. To convert metric horsepower to milliwatts, multiply by 735498.75; to go the other way, divide by 735498.75 or multiply by 1.3596 × 10^-6. The factor is exact rather than rounded: it follows from NIST Special Publication 811. Exactly 75 kilogram-force meters a second, which is 1.4% less than mechanical horsepower.
Factor checked against the defining standard · How we check
- Metric horsepower × 735498.75
1 * 735498.75735,498.75 mW
1 metric horsepower in every power unit
| Unit | Value | Exact factor |
|---|---|---|
| horsepower | 0.9863200706 hp | × 0.98632007062 |
| metric horsepower (as entered) | 1 PS | — |
| watts | 735.49875 W | × 735.49875 |
| kilowatts | 0.73549875 kW | × 0.73549875 |
| milliwatts | 735,498.75 mW | × 735,498.75 |
| megawatts | 0.00073549875 MW | × 0.00073549875 |
| tons of refrigeration | 0.2091354922 TR | × 0.209135492166 |
| BTU per hour | 2,509.625906 BTU/h | × 2,509.62590599 |
Factors are entered by hand from NIST Special Publication 811 rather than derived from a units library, so the ones that terminate are exact rather than rounded.
How do you convert metric horsepower to milliwatts? The converter and the working
- 1.Take the measurement in metric horsepower.
- 2.Multiply by 735498.75 — that is how many milliwatts fit in one metric horsepower.
- 3.To go back the other way, divide by 735498.75, or multiply by 1.3596 × 10^-6.
Worked example: 25 metric horsepower to milliwatts
- Formula
- PS × 735498.75 = mW
- Arithmetic
- 25 × 735498.75 = 18,387,468.75 mW
- Answer
- 25 PS = 18,387,468.75 mW
The factor is exact, so this figure is exact too — only the display is rounded.
Metric horsepower to milliwatts conversion table
| Metric horsepower | Milliwatts |
|---|---|
| 1 PS | 735,498.75 mW |
| 2 PS | 1,470,997.5 mW |
| 3 PS | 2,206,496.25 mW |
| 4 PS | 2,941,995 mW |
| 5 PS | 3,677,493.75 mW |
| 6 PS | 4,412,992.5 mW |
| 7 PS | 5,148,491.25 mW |
| 8 PS | 5,883,990 mW |
| 9 PS | 6,619,488.75 mW |
| 10 PS | 7,354,987.5 mW |
| 12 PS | 8,825,985 mW |
| 15 PS | 11,032,481.25 mW |
| 20 PS | 14,709,975 mW |
| 25 PS | 18,387,468.75 mW |
| 50 PS | 36,774,937.5 mW |
| 100 PS | 73,549,875 mW |
| 200 PS | 147,099,750 mW |
| 300 PS | 220,649,625 mW |
| 500 PS | 367,749,375 mW |
| 1000 PS | 735,498,750 mW |
| 2000 PS | 1,470,997,500 mW |
| 5000 PS | 3,677,493,750 mW |
| 10000 PS | 7,354,987,500 mW |
What is a metric horsepower?
Exactly 75 kilogram-force meters a second, which is 1.4% less than mechanical horsepower. A German car quoted at 150 PS is 148 hp, and the difference is the definition rather than the engine.
What is a milliwatt?
A thousandth of a watt. Radio transmit power, laser output and audio signal levels are all quoted in it, and dBm is referenced to exactly one.
How many milliwatts are in a metric horsepower?
One metric horsepower is 735498.75 milliwatts, exactly. Going the other way, one milliwatt is 1.3596 × 10^-6 metric horsepower. Both figures come from the same defined relation rather than from a measurement, which is why they are the same today as they were in 1959.
Every power unit here
The whole group — 8 units with their symbols and the size of each one in watts — is on the conversion index, along with every pair it makes. The table above already gives each of them relative to a metric horsepower.
Source: NIST Special Publication 811 — mechanical horsepower is 550 ft·lbf/s exactly
Cite this page
- APA
- Rule Calculator. (2026). Convert Metric horsepower to milliwatts. Rule Calculator. https://rulecalculators.com/convert/metric-horsepower-to-milliwatt
- MLA
- "Convert Metric horsepower to milliwatts." Rule Calculator, August 16, 2026, https://rulecalculators.com/convert/metric-horsepower-to-milliwatt.
- Chicago
- Rule Calculator. "Convert Metric horsepower to milliwatts." Rule Calculator. Last reviewed August 16, 2026. https://rulecalculators.com/convert/metric-horsepower-to-milliwatt.
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Questions people actually ask
- How many milliwatts are in a metric horsepower?
- 735498.75. A thousandth of a watt. Radio transmit power, laser output and audio signal levels are all quoted in it, and dBm is referenced to exactly one.
- How do I convert milliwatts back to metric horsepower?
- Divide by 735498.75, or multiply by 1.3596 × 10^-6 — they are the same operation.
Other power conversions
Milliwatts to metric horsepower — the same conversion the other way.