Convert Kilowatt-hours to Watt-hours
1 kilowatt-hour is 1,000 Wh. One kilowatt-hour is exactly 1000 watt-hours.
One kilowatt-hour is 1000 watt-hours. To convert kilowatt-hours to watt-hours, multiply by 1000; to go the other way, divide by 1000 or multiply by 0.001. The factor is exact rather than rounded: it follows from NIST Special Publication 811. A thousand watt-hours, and the unit every electricity bill is added up in.
Factor checked against the defining standard · How we check
- Kilowatt-hours × 1000
value * 10001,000 Wh
1 kilowatt-hour in every energy unit
| Unit | Value | Exact factor |
|---|---|---|
| joules | 3,600,000 J | × 3,600,000 |
| kilojoules | 3,600 kJ | × 3,600 |
| calories | 860,420.6501 cal | × 860,420.650096 |
| kilocalories | 860.4206501 kcal | × 860.420650096 |
| watt-hours | 1,000 Wh | × 1,000 |
| kilowatt-hours (as entered) | 1 kWh | — |
| British thermal units | 3,412.141633 BTU | × 3,412.14163313 |
| foot-pounds | 2,655,223.737 ft·lbf | × 2,655,223.7374 |
Factors are entered by hand from NIST Special Publication 811 rather than derived from a units library, so the ones that terminate are exact rather than rounded.
How do you convert kilowatt-hours to watt-hours?
- 1.Take the measurement in kilowatt-hours.
- 2.Multiply by 1000 — that is how many watt-hours fit in one kilowatt-hour.
- 3.To go back the other way, divide by 1000, or multiply by 0.001.
Worked example: 25 kilowatt-hours to watt-hours
- Formula
- kWh × 1000 = Wh
- Arithmetic
- 25 × 1000 = 25,000 Wh
- Answer
- 25 kWh = 25,000 Wh
The factor is exact, so this figure is exact too — only the display is rounded.
Kilowatt-hours to watt-hours conversion table
| Kilowatt-hours | Watt-hours |
|---|---|
| 1 kWh | 1,000 Wh |
| 2 kWh | 2,000 Wh |
| 3 kWh | 3,000 Wh |
| 4 kWh | 4,000 Wh |
| 5 kWh | 5,000 Wh |
| 6 kWh | 6,000 Wh |
| 7 kWh | 7,000 Wh |
| 8 kWh | 8,000 Wh |
| 9 kWh | 9,000 Wh |
| 10 kWh | 10,000 Wh |
| 12 kWh | 12,000 Wh |
| 15 kWh | 15,000 Wh |
| 20 kWh | 20,000 Wh |
| 25 kWh | 25,000 Wh |
| 50 kWh | 50,000 Wh |
| 100 kWh | 100,000 Wh |
| 200 kWh | 200,000 Wh |
| 300 kWh | 300,000 Wh |
| 500 kWh | 500,000 Wh |
| 1000 kWh | 1,000,000 Wh |
| 2000 kWh | 2,000,000 Wh |
| 5000 kWh | 5,000,000 Wh |
| 10000 kWh | 10,000,000 Wh |
What is a kilowatt-hour?
A thousand watt-hours, and the unit every electricity bill is added up in. Exactly 3.6 megajoules, and the reason a 100 W bulb left on for ten hours costs one unit.
What is a watt-hour?
One watt sustained for an hour, so exactly 3,600 joules. Battery capacity is quoted here because it is an amount of energy rather than a rate.
How many watt-hours are in a kilowatt-hour?
One kilowatt-hour is 1000 watt-hours, exactly. Going the other way, one watt-hour is 0.001 kilowatt-hours. Both figures come from the same defined relation rather than from a measurement, which is why they are the same today as they were in 1959.
Every energy unit here
| Unit | Symbol | One of these is |
|---|---|---|
| Joules | J | the base unit |
| Kilojoules | kJ | 1000 joule |
| Calories | cal | 4.184 joule |
| Kilocalories | kcal | 4184 joule |
| Watt-hours | Wh | 3600 joule |
| Kilowatt-hours | kWh | 3600000 joule |
| British thermal units | BTU | 1055.0559 joule |
| Foot-pounds | ft·lbf | 1.3558179 joule |
Source: NIST Special Publication 811 — the thermochemical calorie is exactly 4.184 J
Questions people actually ask
- How many watt-hours are in a kilowatt-hour?
- 1000. One watt sustained for an hour, so exactly 3,600 joules. Battery capacity is quoted here because it is an amount of energy rather than a rate.
- How do I convert watt-hours back to kilowatt-hours?
- Divide by 1000, or multiply by 0.001 — they are the same operation.
Other energy conversions
Watt-hours to kilowatt-hours — the same conversion the other way.