The watt-hour
The watt-hour (Wh) equals 3,600 joules — the energy delivered by one watt of power over one hour. It is the natural unit for batteries, small electronics, and short-duration electrical loads.
Watt-hours to Kilowatt-hours Converter
1 Wh = 0.001 kWh
1 watt-hour equals 0.001 kilowatt-hours. To convert watt-hours to kilowatt-hours, multiply the watt-hour value by 0.001. For quick reference: 1 Wh = 0.001 kWh, 5 Wh = 0.005 kWh, 10 Wh = 0.01 kWh, 100 Wh = 0.1 kWh.
Formula
Kilowatt-hours = Watt-hours × 0.001Quick
How to convert watt-hours to kilowatt-hours
Take your value
Start with your value in watt-hours.
Multiply by 0.001
Multiply the watt-hour value by 0.001. This is the exact conversion factor from watt-hours to kilowatt-hours.
Read the result
The product is your value in kilowatt-hours. For example, 5 Wh × 0.001 = 0.005 kWh.
Conversion formula
The exact factor from watt-hours to kilowatt-hours is 0.001.
Kilowatt-hours = Watt-hours × 0.001
Watt-hours to Kilowatt-hours conversion table
Fifty common reference values, hand-picked for skim utility. Use the calculator above for any value not listed.
| Watt-hours (Wh) | Kilowatt-hours (kWh) |
|---|---|
| 0.001 Wh | 1.0000 × 10^−6 kWh |
| 0.01 Wh | 1.0000 × 10^−5 kWh |
| 0.1 Wh | 0.0001 kWh |
| 0.5 Wh | 0.0005 kWh |
| 1 Wh | 0.001 kWh |
| 1.5 Wh | 0.0015 kWh |
| 2 Wh | 0.002 kWh |
| 5 Wh | 0.005 kWh |
| 10 Wh | 0.01 kWh |
| 20 Wh | 0.02 kWh |
| 50 Wh | 0.05 kWh |
| 100 Wh | 0.1 kWh |
| 200 Wh | 0.2 kWh |
| 250 Wh | 0.25 kWh |
| 500 Wh | 0.5 kWh |
| 1000 Wh | 1 kWh |
| 2000 Wh | 2 kWh |
| 2500 Wh | 2.5 kWh |
| 3600 Wh | 3.6 kWh |
| 5000 Wh | 5 kWh |
| 7500 Wh | 7.5 kWh |
| 10000 Wh | 10 kWh |
| 25000 Wh | 25 kWh |
| 50000 Wh | 50 kWh |
| 100000 Wh | 100 kWh |
| 250000 Wh | 250 kWh |
| 500000 Wh | 500 kWh |
| 1000000 Wh | 1000 kWh |
| 2000000 Wh | 2000 kWh |
| 3600000 Wh | 3600 kWh |
| 5000000 Wh | 5000 kWh |
| 10000000 Wh | 10000 kWh |
| 25000000 Wh | 25000 kWh |
| 50000000 Wh | 50000 kWh |
| 100000000 Wh | 100000 kWh |
| 250000000 Wh | 250000 kWh |
| 500000000 Wh | 500000 kWh |
| 1000000000 Wh | 1000000 kWh |
| 2000000000 Wh | 2000000 kWh |
| 5000000000 Wh | 5000000 kWh |
| 10000000000 Wh | 10000000 kWh |
| 20000000000 Wh | 20000000 kWh |
| 50000000000 Wh | 50000000 kWh |
| 100000000000 Wh | 100000000 kWh |
| 1000000000000 Wh | 1000000000 kWh |
| 10000000000000 Wh | 10000000000 kWh |
| 100000000000000 Wh | 100000000000 kWh |
| 1000000000000000 Wh | 1000000000000 kWh |
| 10000000000000000 Wh | 10000000000000 kWh |
| 100000000000000000 Wh | 100000000000000 kWh |
Real-world reference
A typical smartphone battery stores about 15 Wh. An LED bulb uses 8 Wh per hour of operation.
Frequently asked questions
- How many kilowatt-hours are in 1 watt-hour?
- 1 watt-hour equals 0.001 kilowatt-hours.
- How do I convert watt-hours to kilowatt-hours?
- Multiply the watt-hour value by 0.001. So x Wh × 0.001 = the equivalent in kWh.
- What is 5 watt-hours in kilowatt-hours?
- 5 watt-hours equals 0.005 kilowatt-hours.
- What is 10 watt-hours in kilowatt-hours?
- 10 watt-hours equals 0.01 kilowatt-hours.
- What is 100 watt-hours in kilowatt-hours?
- 100 watt-hours equals 0.1 kilowatt-hours.
- How do I convert back from kilowatt-hours to watt-hours?
- Multiply the kilowatt-hour value by 1000. For example, 1 kWh = 1000 Wh.
- Is the watt-hour bigger than the kilowatt-hour?
- No. 1 watt-hour is smaller than 1 kilowatt-hour. It takes 1000 watt-hours to equal 1 kilowatt-hour.
- Are these conversion factors exact?
- Yes. The factor of 0.001 is derived directly from the SI definitions of watt-hour and kilowatt-hour.
About the watt-hour and the kilowatt-hour
The kilowatt-hour
The kilowatt-hour (kWh) equals exactly 3,600,000 joules — the unit on every household electricity bill. One kWh runs a 1,000 W appliance for one hour.