Watts to kW Converter
Convert watt to kilowatt instantly. 1 W = 0.001 kW, worked steps and a full reference table.
How to use it
- Type the value in watt — the result updates as you type.
- Use Swap to flip the direction, or change either dropdown to convert between any two units.
- Click the result to copy it. The URL updates too, so you can bookmark or share the exact conversion.
Examples
| 1 W | 0.001 kW |
| 5 W | 0.005 kW |
| 10 W | 0.01 kW |
| 100 W | 0.1 kW |
One watt equals 0.001 kilowatts (kW). To convert watts to kilowatts, multiply by 0.001; to go back the other way, multiply by 1000 instead.
The converter above does it as you type and shows the working underneath, so you can check the arithmetic rather than take the number on trust.
What watts and kilowatts actually measure
Watt (W) — The watt is the SI unit of power — one joule per second. Light bulbs, appliances, audio equipment and solar panels.
Kilowatt (kW) — A kilowatt is a thousand watts. Heaters, EV chargers, motors and domestic electricity supply.
Watts to kW conversion table
The most common values, worked out in advance. Anything not listed can be typed straight into the converter.
| W | kW |
|---|---|
| 1 W | 0.001 kW |
| 2 W | 0.002 kW |
| 5 W | 0.005 kW |
| 10 W | 0.01 kW |
| 25 W | 0.025 kW |
| 50 W | 0.05 kW |
| 100 W | 0.1 kW |
How to convert watts to kilowatts by hand
Multiply the number of watts by 0.001.
For example, 25 W × 0.001 = 0.025 kW.
Going the other way, divide by 0.001 — or multiply by 1000, which is the same thing and easier to do in your head.
Everything runs in your browser
There is no server involved in the calculation. The numbers you type never leave your device, nothing is logged, and the page keeps working with no connection once it has loaded. That is not a marketing line — it is simply how the tool is built, because a calculation like this has no reason to touch a network.
Questions people ask
How many kW are in 1 W?
1 W equals exactly 0.001 kW. Multiply any value in watt by 0.001 to get kilowatt.
Is anything uploaded to a server?
No. The whole calculation happens in your browser. Nothing is sent anywhere, and the page keeps working offline once loaded.
Last updated 18 August 2026