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Convert watt-hours to kilowatt-hours
Instant, accurate Wh → kWh conversion with a live converter, table and formula.
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1 watt-hour = 0.001 kilowatt-hours
1 kilowatt-hour = 1000 watt-hours
watt-hours to kilowatt-hours table
| watt-hours (Wh) | kilowatt-hours (kWh) |
|---|---|
| 0.5 | 0.0005 |
| 1 | 0.001 |
| 2 | 0.002 |
| 5 | 0.005 |
| 10 | 0.01 |
| 20 | 0.02 |
| 50 | 0.05 |
| 100 | 0.1 |
| 500 | 0.5 |
| 1000 | 1 |
Formula
kilowatt-hours = watt-hours × 0.001.
Example
10 watt-hours = 0.01 kilowatt-hours.
What is a watt-hour?
A watt-hour (Wh) is the energy of one watt for one hour (3,600 J).
What is a kilowatt-hour?
A kilowatt-hour (kWh) is 1,000 watt-hours — the unit on your electricity bill.
Real-world reference points
A food Calorie is a kilocalorie: an apple is ~52 kcal, a daily diet ~2,000 kcal (~8.4 MJ).
| Reference | watt-hours | kilowatt-hours |
|---|---|---|
| AA battery | 4.28 Wh | 0.00428 kWh |
| Smartphone battery (13 Wh) | 13 Wh | 0.013 kWh |
| Apple (52 kcal) | 60.44 Wh | 0.0604 kWh |
| Daily diet (2,000 kcal) | 2,324 Wh | 2.32 kWh |
| 1 kWh (unit of electricity) | 1,000 Wh | 1 kWh |
Mistakes to avoid with energy conversions
- Food 'Calories' are kilocalories — mixing cal and kcal creates 1000× errors.
- Confusing kWh (energy) with kW (power) on bills and appliance labels.
- Comparing battery mAh across different voltages — energy needs Wh, not mAh alone.
Frequently asked questions
How many kilowatt-hours in a watt-hours?+
1 watt-hour = 0.001 kilowatt-hours.
How do I convert watt-hours to kilowatt-hours?+
Enter the value in the watt-hours box above and the kilowatt-hours value appears instantly. You can also type in the kilowatt-hours box to convert the other way.
Is this Wh to kWh converter free?+
Yes — it is 100% free, needs no sign-up, and runs entirely in your browser.