Convert Kilowatts to Milliwatts
1 kilowatt (kW) equals 1000000 milliwatts (mW).
1 kW = 1000000 mW
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk kilowatt to milliwatt converter to paste a column from Excel.
How to Convert Kilowatt to Milliwatt
- 1 kW = 1000000 mW
- 1 mW = 0.000001 kW
- Example: convert 15 kW to mW: 15 kW = 15 × 1000000 mW = 15000000 mW
Formula
mW = kW × 1000000
Derivation from SI units:
- 1 kW = 10³ W
- 1 mW = 10⁻³ W
- 1 kW = 1000 W ÷ 0.001 W per mW = 1000000 mW
Both units are defined exactly, so the factor is exact. Kilowatt definition: kilowatt; Milliwatt definition: milliwatt.
Worked examples
- A reading of 3.5 kW converts to 3500000 mW.
3.5 kW × 1000000 = 3500000 mW - A value of 22 kW is 22000000 mW.
22 kW × 1000000 = 22000000 mW
Kilowatt to Milliwatt conversion table
| Kilowatts (kW) | Milliwatts (mW) |
|---|---|
| 0.5 kW | 500000 mW |
| 0.75 kW | 750000 mW |
| 1 kW | 1000000 mW |
| 1.5 kW | 1500000 mW |
| 2.2 kW | 2200000 mW |
| 3 kW | 3000000 mW |
| 3.5 kW | 3500000 mW |
| 5 kW | 5000000 mW |
| 7.5 kW | 7500000 mW |
| 10 kW | 10000000 mW |
| 11 kW | 11000000 mW |
| 15 kW | 15000000 mW |
| 22 kW | 22000000 mW |
| 37 kW | 37000000 mW |
| 50 kW | 50000000 mW |
| 75 kW | 75000000 mW |
| 100 kW | 100000000 mW |
| 150 kW | 150000000 mW |
| 250 kW | 250000000 mW |
Where it's used
Kilowatts are used for engine and motor power (1 kW ≈ 1.34 hp), while milliwatts appear in laser pointer and diode output. Both measure power (energy per unit time), so the conversion is a fixed factor.
Kilowatt to other power units
| Conversion | 1 kW equals |
|---|---|
| kilowatt to watt | 1000 W |
| kilowatt to milliwatt | 1000000 mW |
| kilowatt to megawatt | 0.001 MW |
| kilowatt to horsepower | 1.34102209 hp |
| kilowatt to metric horsepower | 1.359621617 PS |
| kilowatt to BTU per hour | 3412.141633 BTU/h |
| kilowatt to refrigeration ton | 0.2843451361 TR |
| kilowatt to kilocalorie per hour | 859.8452279 kcal/h |
| kilowatt to foot-pound per second | 737.5621493 ft·lbf/s |
Frequently asked questions
How many milliwatts are in 1 kilowatt?
1 kW = 1000000 mW.
How do I convert kilowatts to milliwatts?
Multiply the value in kW by 1000000. For example, 15 kW × 1000000 = 15000000 mW.
Is the kW to mW conversion exact?
Yes. Both units are defined exactly, and 1 kW is exactly 1000000 mW.
Sources
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 7, SI prefixes.
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Convert Kilowatts to Milliwatts. Retrieved October 17, 2026, from https://scientificconverters.com/power/kilowatts-to-milliwatts/
IEEE
Scientific Converters, "Convert Kilowatts to Milliwatts," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/power/kilowatts-to-milliwatts/