Convert Watts to Kilowatts
1 watt (W) equals 0.001 kilowatts (kW).
1 W = 0.001 kW
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk watt to kilowatt converter to paste a column from Excel.
How to Convert Watt to Kilowatt
- 1 W = 0.001 kW
- 1 kW = 1000 W
- Example: convert 15 W to kW: 15 W = 15 × 0.001 kW = 0.015 kW
Formula
kW = W ÷ 1000
Derivation from SI units:
- 1 W = 1 J/s = 1 kg·m²·s⁻³
- 1 kW = 10³ W
Both units are defined exactly, so the factor is exact. Watt definition: watt; Kilowatt definition: kilowatt.
Worked examples
- A reading of 100 W converts to 0.1 kW.
100 W × 0.001 = 0.1 kW - A value of 1500 W is 1.5 kW.
1500 W × 0.001 = 1.5 kW
Watt to Kilowatt conversion table
| Watts (W) | Kilowatts (kW) |
|---|---|
| 1 W | 0.001 kW |
| 5 W | 0.005 kW |
| 10 W | 0.01 kW |
| 40 W | 0.04 kW |
| 60 W | 0.06 kW |
| 100 W | 0.1 kW |
| 250 W | 0.25 kW |
| 500 W | 0.5 kW |
| 746 W | 0.746 kW |
| 1000 W | 1 kW |
| 1500 W | 1.5 kW |
| 2000 W | 2 kW |
| 3500 W | 3.5 kW |
| 5000 W | 5 kW |
| 10000 W | 10 kW |
Where it's used
Watts are used for electrical appliance ratings, while kilowatts appear in engine and motor power (1 kW ≈ 1.34 hp). Both measure power (energy per unit time), so the conversion is a fixed factor.
Watt to other power units
| Conversion | 1 W equals |
|---|---|
| watt to milliwatt | 1000 mW |
| watt to kilowatt | 0.001 kW |
| watt to megawatt | 0.000001 MW |
| watt to horsepower | 0.00134102209 hp |
| watt to metric horsepower | 0.001359621617 PS |
| watt to BTU per hour | 3.412141633 BTU/h |
| watt to refrigeration ton | 0.0002843451361 TR |
| watt to kilocalorie per hour | 0.8598452279 kcal/h |
| watt to foot-pound per second | 0.7375621493 ft·lbf/s |
Frequently asked questions
How many kilowatts are in 1 watt?
1 W = 0.001 kW.
How do I convert watts to kilowatts?
Multiply the value in W by 0.001, or divide it by 1000. For example, 15 W × 0.001 = 0.015 kW.
Is the W to kW conversion exact?
Yes. Both units are defined exactly, and 1 W is exactly 0.001 kW.
Sources
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 4, coherent derived units with special names.
- 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 Watts to Kilowatts. Retrieved October 17, 2026, from https://scientificconverters.com/power/watts-to-kilowatts/
IEEE
Scientific Converters, "Convert Watts to Kilowatts," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/power/watts-to-kilowatts/