How to convert watts to kilowatts
To convert watts to kilowatts, multiply by 0.001. Power conversions compare engines, motors, appliances, solar panels and air conditioners.
Watt to Kilowatt conversion table
| Watt (W) | Kilowatt (kW) |
|---|---|
| 0.1 W | 0.0001 kW |
| 0.5 W | 0.0005 kW |
| 1 W | 0.001 kW |
| 2 W | 0.002 kW |
| 3 W | 0.003 kW |
| 4 W | 0.004 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 |
About the units
Watt (W)
The watt is the SI unit of power, one joule per second.
Kilowatt (kW)
A kilowatt equals 1,000 watts and rates engines, heaters and EV chargers.
How to use this converter
- Type the number of watts (W) in the input box.
- The result in kilowatts appears instantly — no button needed.
- See the same value in every other power unit just below.
- Use “Swap units” to convert kilowatts back to watts.
When you’ll use the watt to kilowatt conversion
Converting watts to kilowatts comes up more often than you might expect — for example when choosing an air conditioner by BTU/h, comparing engines in hp and kW, or sizing a generator or inverter. Type your number once and you get the exact answer plus every related unit, so you don’t need to convert twice.
💡 The factor is exact and easy to remember: 1 W = 0.001 kW.
Watch out for these mix-ups
- Mechanical and metric horsepower differ slightly (745.7 W vs 735.5 W).
- Confusing power (W) with energy used over time (Wh).
Tips for better results
- Double-check which system a unit belongs to (for example US vs UK gallons).
- Use the swap button to convert in the opposite direction instantly.
- Bookmark the conversions you use most — each pair has its own page.
Frequently asked questions
How many kilowatts are in one watt?
One watt equals 0.001 kilowatts. 0.001 is the exact factor used by this converter.
How do I convert watts to kilowatts?
Multiply the value in watts by 0.001. To go the other way, multiply kilowatts by 1,000.
What is 10 W in kW?
10 W = 0.01 kW. Also, 5 W = 0.005 kW and 100 W = 0.1 kW.
What is the difference between a watt and a kilowatt?
The watt is the SI unit of power, one joule per second. A kilowatt equals 1,000 watts and rates engines, heaters and EV chargers.
Is this tool free and private?
Yes — the Watt to Kilowatt is completely free with no sign-up, and it runs entirely in your browser, so the values you enter are never uploaded to our servers.
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