Watt-hours (W·h) to Kilowatt-hours (kW·h) Conversion
Watt-hours
The watt-hour (W·h) is a unit of energy equal to exactly 3,600 joules, defined as the energy consumed by a one-watt device operating for one hour. It is used in electrical engineering and consumer electronics for expressing battery capacities: a smartphone battery typically holds 10–20 Wh. In aviation, aircraft battery capacities are specified in watt-hours for international transport regulations (lithium batteries above 100 Wh face restrictions).
Kilowatt-hours
The kilowatt-hour (kW·h) is a unit of energy equal to exactly 3,600,000 joules (3.6 MJ), defined as the energy consumed by a one-kilowatt device operating for one hour. It is the standard unit on electricity bills worldwide. A typical European household consumes approximately 3,500 kWh per year. One kWh powers a 100-watt bulb for 10 hours, charges an electric vehicle by approximately 5–8 km of driving range, or powers the average laptop for about 10 hours.
| Watt-hours (W·h) | Kilowatt-hours (kW·h) |
|---|---|
| 0.1 W·h | 0.0001 kW·h |
| 1 W·h | 0.001 kW·h |
| 2 W·h | 0.002 kW·h |
| 3 W·h | 0.003 kW·h |
| 5 W·h | 0.005 kW·h |
| 10 W·h | 0.01 kW·h |
| 20 W·h | 0.02 kW·h |
| 30 W·h | 0.03 kW·h |
| 50 W·h | 0.05 kW·h |
| 100 W·h | 0.1 kW·h |
| 1000 W·h | 1 kW·h |
Frequently Asked Questions (FAQ)
How many kilowatt-hours are in 1 watt-hours?
1 watt-hours (W·h) is exactly 0.001 kilowatt-hours (kW·h).
How do I convert watt-hours to kilowatt-hours?
Multiply the value in watt-hours by 0.001 to get the result in kilowatt-hours. Or use the converter above — type any number and see the result instantly.