Convert Milliwatts to Kilowatts
1 milliwatt is 0.000001 kW. One milliwatt is exactly 0.000001 kilowatts.
One milliwatt is 1.0000 × 10^-6 kilowatts. To convert milliwatts to kilowatts, multiply by 1.0000 × 10^-6; to go the other way, divide by 1.0000 × 10^-6 or multiply by 1000000. The relation is exact but the figure is not: it is a rounding of a number that does not terminate, and it follows from NIST Special Publication 811. A thousandth of a watt.
Factor checked against the defining standard · How we check
- Milliwatts × 1.0000 × 10^-6
1 * 0.0000010 kW
1 milliwatt in every power unit
| Unit | Value | Exact factor |
|---|---|---|
| horsepower | 0.00000134102209 hp | × 0.0000013410220896 |
| metric horsepower | 0.000001359621617 PS | × 0.0000013596216173 |
| watts | 0.001 W | × 0.001 |
| kilowatts | 0.000001 kW | × 0.000001 |
| milliwatts (as entered) | 1 mW | — |
| megawatts | 0.000000001 MW | × 0.000000001 |
| tons of refrigeration | 0.0000002843451361 TR | × 0.000000284345136094 |
| BTU per hour | 0.003412141633 BTU/h | × 0.00341214163313 |
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 milliwatts to kilowatts? The converter and the working
- 1.Take the measurement in milliwatts.
- 2.Multiply by 1.0000 × 10^-6 — that is how many kilowatts fit in one milliwatt.
- 3.To go back the other way, divide by 1.0000 × 10^-6, or multiply by 1000000.
Worked example: 25 milliwatts to kilowatts
- Formula
- mW × 1.0000 × 10^-6 = kW
- Arithmetic
- 25 × 1.0000 × 10^-6 = 0.000025 kW
- Answer
- 25 mW = 0.000025 kW
The factor is rounded for display; the figure above is computed from the full value.
Milliwatts to kilowatts conversion table
| Milliwatts | Kilowatts |
|---|---|
| 1 mW | 0.000001 kW |
| 2 mW | 0.000002 kW |
| 3 mW | 0.000003 kW |
| 4 mW | 0.000004 kW |
| 5 mW | 0.000005 kW |
| 6 mW | 0.000006 kW |
| 7 mW | 0.000007 kW |
| 8 mW | 0.000008 kW |
| 9 mW | 0.000009 kW |
| 10 mW | 0.00001 kW |
| 12 mW | 0.000012 kW |
| 15 mW | 0.000015 kW |
| 20 mW | 0.00002 kW |
| 25 mW | 0.000025 kW |
| 50 mW | 0.00005 kW |
| 100 mW | 0.0001 kW |
| 200 mW | 0.0002 kW |
| 300 mW | 0.0003 kW |
| 500 mW | 0.0005 kW |
| 1000 mW | 0.001 kW |
| 2000 mW | 0.002 kW |
| 5000 mW | 0.01 kW |
| 10000 mW | 0.01 kW |
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.
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.
How many kilowatts are in a milliwatt?
One milliwatt is 1.0000 × 10^-6 kilowatts. Going the other way, one kilowatt is 1000000 milliwatts. 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 milliwatt.
Source: NIST Special Publication 811 — mechanical horsepower is 550 ft·lbf/s exactly
Cite this page
- APA
- Rule Calculator. (2026). Convert Milliwatts to kilowatts. Rule Calculator. https://rulecalculators.com/convert/milliwatt-to-kilowatt
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- "Convert Milliwatts to kilowatts." Rule Calculator, August 16, 2026, https://rulecalculators.com/convert/milliwatt-to-kilowatt.
- Chicago
- Rule Calculator. "Convert Milliwatts to kilowatts." Rule Calculator. Last reviewed August 16, 2026. https://rulecalculators.com/convert/milliwatt-to-kilowatt.
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Questions people actually ask
- How many kilowatts are in a milliwatt?
- 1.0000 × 10^-6. A thousand watts. Electric motors, kettles and EV chargers are rated here, and a kilowatt is close to 1.34 horsepower.
- How do I convert kilowatts back to milliwatts?
- Divide by 1.0000 × 10^-6, or multiply by 1000000 — they are the same operation.
Other power conversions
Kilowatts to milliwatts — the same conversion the other way.