Convert Kilowatts to Milliwatts
1 kilowatt is 1,000,000 mW. One kilowatt is exactly 1000000 milliwatts.
One kilowatt is 1000000 milliwatts. To convert kilowatts to milliwatts, multiply by 1000000; to go the other way, divide by 1000000 or multiply by 1.0000 × 10^-6. The factor is exact rather than rounded: it follows from NIST Special Publication 811. A thousand watts.
Factor checked against the defining standard · How we check
- Kilowatts × 1000000
1 * 10000001,000,000 mW
1 kilowatt in every power unit
| Unit | Value | Exact factor |
|---|---|---|
| horsepower | 1.34102209 hp | × 1.3410220896 |
| metric horsepower | 1.359621617 PS | × 1.3596216173 |
| watts | 1,000 W | × 1,000 |
| kilowatts (as entered) | 1 kW | — |
| milliwatts | 1,000,000 mW | × 1,000,000 |
| megawatts | 0.001 MW | × 0.001 |
| tons of refrigeration | 0.2843451361 TR | × 0.284345136094 |
| BTU per hour | 3,412.141633 BTU/h | × 3,412.14163313 |
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 kilowatts to milliwatts? The converter and the working
- 1.Take the measurement in kilowatts.
- 2.Multiply by 1000000 — that is how many milliwatts fit in one kilowatt.
- 3.To go back the other way, divide by 1000000, or multiply by 1.0000 × 10^-6.
Worked example: 25 kilowatts to milliwatts
- Formula
- kW × 1000000 = mW
- Arithmetic
- 25 × 1000000 = 25,000,000 mW
- Answer
- 25 kW = 25,000,000 mW
The factor is exact, so this figure is exact too — only the display is rounded.
Kilowatts to milliwatts conversion table
| Kilowatts | Milliwatts |
|---|---|
| 1 kW | 1,000,000 mW |
| 2 kW | 2,000,000 mW |
| 3 kW | 3,000,000 mW |
| 4 kW | 4,000,000 mW |
| 5 kW | 5,000,000 mW |
| 6 kW | 6,000,000 mW |
| 7 kW | 7,000,000 mW |
| 8 kW | 8,000,000 mW |
| 9 kW | 9,000,000 mW |
| 10 kW | 10,000,000 mW |
| 12 kW | 12,000,000 mW |
| 15 kW | 15,000,000 mW |
| 20 kW | 20,000,000 mW |
| 25 kW | 25,000,000 mW |
| 50 kW | 50,000,000 mW |
| 100 kW | 100,000,000 mW |
| 200 kW | 200,000,000 mW |
| 300 kW | 300,000,000 mW |
| 500 kW | 500,000,000 mW |
| 1000 kW | 1,000,000,000 mW |
| 2000 kW | 2,000,000,000 mW |
| 5000 kW | 5,000,000,000 mW |
| 10000 kW | 10,000,000,000 mW |
What is a kilowatt?
A thousand watts. Electric motors, kettles and EV chargers are rated here, and a kilowatt is close to 1.34 horsepower.
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 kilowatt?
One kilowatt is 1000000 milliwatts, exactly. Going the other way, one milliwatt is 1.0000 × 10^-6 kilowatts. 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 kilowatt.
Source: NIST Special Publication 811 — mechanical horsepower is 550 ft·lbf/s exactly
Cite this page
- APA
- Rule Calculator. (2026). Convert Kilowatts to milliwatts. Rule Calculator. https://rulecalculators.com/convert/kilowatt-to-milliwatt
- MLA
- "Convert Kilowatts to milliwatts." Rule Calculator, August 16, 2026, https://rulecalculators.com/convert/kilowatt-to-milliwatt.
- Chicago
- Rule Calculator. "Convert Kilowatts to milliwatts." Rule Calculator. Last reviewed August 16, 2026. https://rulecalculators.com/convert/kilowatt-to-milliwatt.
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Questions people actually ask
- How many milliwatts are in a kilowatt?
- 1000000. 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 kilowatts?
- Divide by 1000000, or multiply by 1.0000 × 10^-6 — they are the same operation.
Other power conversions
Milliwatts to kilowatts — the same conversion the other way.