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Convert kilowatt-hours to watt-hours
Instant, accurate kWh → Wh conversion with a live converter, table and formula.
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1 kilowatt-hour = 1000 watt-hours
1 watt-hour = 0.001 kilowatt-hours
kilowatt-hours to watt-hours table
| kilowatt-hours (kWh) | watt-hours (Wh) |
|---|---|
| 0.5 | 500 |
| 1 | 1000 |
| 2 | 2000 |
| 5 | 5000 |
| 10 | 10000 |
| 20 | 20000 |
| 50 | 50000 |
| 100 | 100000 |
| 500 | 500000 |
| 1000 | 1000000 |
Formula
watt-hours = kilowatt-hours × 1000.
Example
10 kilowatt-hours = 10000 watt-hours.
What is a kilowatt-hour?
A kilowatt-hour (kWh) is 1,000 watt-hours — the unit on your electricity bill.
What is a watt-hour?
A watt-hour (Wh) is the energy of one watt for one hour (3,600 J).
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 | kilowatt-hours | watt-hours |
|---|---|---|
| AA battery | 0.00428 kWh | 4.28 Wh |
| Smartphone battery (13 Wh) | 0.013 kWh | 13 Wh |
| Apple (52 kcal) | 0.0604 kWh | 60.44 Wh |
| Daily diet (2,000 kcal) | 2.32 kWh | 2,324 Wh |
| 1 kWh (unit of electricity) | 1 kWh | 1,000 Wh |
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 watt-hours in a kilowatt-hours?+
1 kilowatt-hour = 1000 watt-hours.
How do I convert kilowatt-hours to watt-hours?+
Enter the value in the kilowatt-hours box above and the watt-hours value appears instantly. You can also type in the watt-hours box to convert the other way.
Is this kWh to Wh converter free?+
Yes — it is 100% free, needs no sign-up, and runs entirely in your browser.