Watt-hours to kilowatt-hours
Type a value in watt-hours to see it in kilowatt-hours straight away, or type in the second box to convert back.
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How to use it
- Type the value in the watt-hours box.
- Read the result in kilowatt-hours as you type, and pick the precision you need.
- Swap the direction to convert back, or copy the result.
How it is calculated
kWh = Wh × 0.001
Multiply the value in watt-hours by 0.001 to get kilowatt-hours.
Example
To convert 25 Wh to kilowatt-hours: 25 × 0.001 = 0.025 kWh.
Conversion table
| Watt-hours (Wh) | Kilowatt-hours (kWh) |
|---|---|
| 1 | 0.001 |
| 2 | 0.002 |
| 3 | 0.003 |
| 5 | 0.005 |
| 10 | 0.01 |
| 20 | 0.02 |
| 25 | 0.025 |
| 50 | 0.05 |
| 100 | 0.1 |
| 250 | 0.25 |
| 500 | 0.5 |
| 1,000 | 1 |
About the units
- Watt-hour
- The energy used by a one watt device in one hour, exactly 3600 joules. Common for battery and power bank capacity.
- Kilowatt-hour
- The energy used by a 1000 watt device in one hour, exactly 3.6 million joules. Electricity bills are charged in this unit.
Limits and caveats
- Results are rounded for display and computed with the browser's floating point precision (about 15 significant digits).
- Both unit factors are exact by their official definitions.
Questions about this tool
How many kilowatt-hours are in one watt-hour?
1 Wh = 0.001 kWh exactly.
How do I convert watt-hours to kilowatt-hours?
Use kWh = Wh × 0.001. For example, 25 Wh = 0.025 kWh.
How many watt-hours are in one kilowatt-hour?
1 kWh = 1,000 Wh.
Which calorie do these converters use?
The thermochemical calorie, exactly 4.184 joules, the factor many countries use to turn kcal into kJ on food labels. The International Table calorie is 4.1868 joules, less than 0.07% larger.
What is the difference between kW and kWh?
A kilowatt is a unit of power, the rate of using energy, while a kilowatt-hour is an amount of energy. A 2 kW heater running for three hours uses 6 kWh.