Convert Megawatts to Milliwatts
1 megawatt is 1,000,000,000 mW. One megawatt is exactly 1000000000 milliwatts.
One megawatt is 1000000000 milliwatts. To convert megawatts to milliwatts, multiply by 1000000000; to go the other way, divide by 1000000000 or multiply by 1.0000 × 10^-9. The factor is exact rather than rounded: it follows from NIST Special Publication 811. A million watts.
Factor checked against the defining standard · How we check
- Megawatts × 1000000000
1 * 10000000001,000,000,000 mW
1 megawatt in every power unit
| Unit | Value | Exact factor |
|---|---|---|
| horsepower | 1,341.02209 hp | × 1,341.0220896 |
| metric horsepower | 1,359.621617 PS | × 1,359.6216173 |
| watts | 1,000,000 W | × 1,000,000 |
| kilowatts | 1,000 kW | × 1,000 |
| milliwatts | 1,000,000,000 mW | × 1,000,000,000 |
| megawatts (as entered) | 1 MW | — |
| tons of refrigeration | 284.3451361 TR | × 284.345136094 |
| BTU per hour | 3,412,141.633 BTU/h | × 3,412,141.63313 |
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 megawatts to milliwatts? The converter and the working
- 1.Take the measurement in megawatts.
- 2.Multiply by 1000000000 — that is how many milliwatts fit in one megawatt.
- 3.To go back the other way, divide by 1000000000, or multiply by 1.0000 × 10^-9.
Worked example: 25 megawatts to milliwatts
- Formula
- MW × 1000000000 = mW
- Arithmetic
- 25 × 1000000000 = 25,000,000,000 mW
- Answer
- 25 MW = 25,000,000,000 mW
The factor is exact, so this figure is exact too — only the display is rounded.
Megawatts to milliwatts conversion table
| Megawatts | Milliwatts |
|---|---|
| 1 MW | 1,000,000,000 mW |
| 2 MW | 2,000,000,000 mW |
| 3 MW | 3,000,000,000 mW |
| 4 MW | 4,000,000,000 mW |
| 5 MW | 5,000,000,000 mW |
| 6 MW | 6,000,000,000 mW |
| 7 MW | 7,000,000,000 mW |
| 8 MW | 8,000,000,000 mW |
| 9 MW | 9,000,000,000 mW |
| 10 MW | 10,000,000,000 mW |
| 12 MW | 12,000,000,000 mW |
| 15 MW | 15,000,000,000 mW |
| 20 MW | 20,000,000,000 mW |
| 25 MW | 25,000,000,000 mW |
| 50 MW | 50,000,000,000 mW |
| 100 MW | 100,000,000,000 mW |
| 200 MW | 200,000,000,000 mW |
| 300 MW | 300,000,000,000 mW |
| 500 MW | 500,000,000,000 mW |
| 1000 MW | 1,000,000,000,000 mW |
| 2000 MW | 2,000,000,000,000 mW |
| 5000 MW | 5,000,000,000,000 mW |
| 10000 MW | 10,000,000,000,000 mW |
What is a megawatt?
A million watts. Generating plant and grid capacity are quoted in it: one megawatt runs roughly 750 homes in the US at average draw.
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 megawatt?
One megawatt is 1000000000 milliwatts, exactly. Going the other way, one milliwatt is 1.0000 × 10^-9 megawatts. 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 megawatt.
Source: NIST Special Publication 811 — mechanical horsepower is 550 ft·lbf/s exactly
Cite this page
- APA
- Rule Calculator. (2026). Convert Megawatts to milliwatts. Rule Calculator. https://rulecalculators.com/convert/megawatt-to-milliwatt
- MLA
- "Convert Megawatts to milliwatts." Rule Calculator, August 16, 2026, https://rulecalculators.com/convert/megawatt-to-milliwatt.
- Chicago
- Rule Calculator. "Convert Megawatts to milliwatts." Rule Calculator. Last reviewed August 16, 2026. https://rulecalculators.com/convert/megawatt-to-milliwatt.
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Questions people actually ask
- How many milliwatts are in a megawatt?
- 1000000000. 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 megawatts?
- Divide by 1000000000, or multiply by 1.0000 × 10^-9 — they are the same operation.
Other power conversions
Milliwatts to megawatts — the same conversion the other way.