Watts to Kilowatts
Convert watts to kilowatts instantly. 1 W = 0.001 kW. Includes the exact factor, a conversion table of common values and the definition of both units.
How to convert watts to kilowatts
To convert watts to kilowatts, divide by 1,000 (multiply by 0.001). The relationship is fixed, so the same factor works for any quantity — there is nothing to look up and nothing that changes with temperature, location or context.
kW = W × 0.001
Watts to Kilowatts conversion table
The values people look up most often, rounded for reading. Use the calculator above for anything in between.
| Watts | Kilowatts |
|---|---|
| 1 W | 0.001 kW |
| 2 W | 0.002 kW |
| 3 W | 0.003 kW |
| 5 W | 0.005 kW |
| 10 W | 0.01 kW |
| 20 W | 0.02 kW |
| 25 W | 0.025 kW |
| 50 W | 0.05 kW |
| 100 W | 0.1 kW |
| 500 W | 0.5 kW |
| 1,000 W | 1 kW |
What is a watt?
The SI unit of power: one joule per second.
What is a kilowatt?
A thousand watts. Vehicle and appliance power is rated in kilowatts.
The formula
kW = W × 0.001
Every result on this page comes from this formula. Nothing is rounded until the final display, so figures match a spreadsheet to the cent.
How to use the Watts to Kilowatts
- Type the number of watts you want to convert.
- Read the result in kilowatts straight away — there is no button to press.
- Check the table below for the values that come up most often, or reverse the conversion with the linked kilowatts to watts page.
Watts to Kilowatts — frequently asked questions
How many kilowatts are in a watt?
One watt equals 0.001 kW. kW = W × 0.001
What is the formula to convert watts to kilowatts?
The formula is kW = W × 0.001. It is an exact definition rather than an approximation, so the conversion never drifts no matter how large the number.
How do I convert kilowatts back to watts?
Divide instead of multiplying: one kilowatt is 1,000 W. The reverse converter is linked in the related tools list.
Is this conversion exact?
Yes. Both units are defined against the same base unit by international agreement, so the factor is exact — any rounding you see is only in the display, which you can widen by entering more decimal places.
Is this watts to kilowatts free to use?
Yes. Every calculator on the site is free, needs no sign-up, and runs entirely in your browser, so your figures never leave your device.
What people search for
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About this calculator
Written and reviewed by The Samsung Calculator editorial team. Every calculator is written against a published formula, reviewed against at least one independent reference implementation, and dated when it changes.
Last reviewed August 19, 2026 · Calculation runs client-side · No data collected · Report an error