Watt-hours to Kilowatt-hours Converter
Convert watt-hours to kilowatt-hours instantly. Type a value, change either unit, or press swap to go the other way. 1 watt-hour = 0.001 kilowatt-hours.
1 watt-hour = 0.001 kilowatt-hours
How to convert watt-hours to kilowatt-hours
kilowatt-hours = watt-hours × 0.001
To convert watt-hours to kilowatt-hours, multiply the value by 0.001. To go back from kilowatt-hours to watt-hours, divide by the same number (or multiply by 1,000).
Worked examples
- 100 Wh: 100 × 0.001 = 0.1 kWh
- 250 Wh: 250 × 0.001 = 0.25 kWh
- 500 Wh: 500 × 0.001 = 0.5 kWh
Divide watt-hours by 1,000. A 500 Wh battery holds 0.5 kWh.
Watt-hours to Kilowatt-hours conversion table
Watt-hours to Kilowatt-hours
| Wh | kWh |
|---|---|
| 10 | 0.01 |
| 37 | 0.037 |
| 100 | 0.1 |
| 250 | 0.25 |
| 500 | 0.5 |
| 1,000 | 1 |
| 3,000 | 3 |
| 5,000 | 5 |
| 10,000 | 10 |
| 13,500 | 13.5 |
Kilowatt-hours to Watt-hours
| kWh | Wh |
|---|---|
| 10 | 10,000 |
| 37 | 37,000 |
| 100 | 100,000 |
| 250 | 250,000 |
| 500 | 500,000 |
| 1,000 | 1,000,000 |
| 3,000 | 3,000,000 |
| 5,000 | 5,000,000 |
| 10,000 | 10,000,000 |
| 13,500 | 13,500,000 |
Energy equivalents
See how one watt-hour and one kilowatt-hour compare with every other energy unit on the site.
1 watt-hour equals
| Unit | Value |
|---|---|
| joules (J) | 3,600 |
| kilojoules (kJ) | 3.6 |
| calories (small) (cal) | 860.4207 |
| kilocalories (food Calories) (kcal) | 0.8604207 |
| kilowatt-hours (kWh) | 0.001 |
| British thermal units (BTU) | 3.412142 |
1 kilowatt-hour equals
| Unit | Value |
|---|---|
| joules (J) | 3,600,000 |
| kilojoules (kJ) | 3,600 |
| calories (small) (cal) | 860,420.7 |
| kilocalories (food Calories) (kcal) | 860.4207 |
| watt-hours (Wh) | 1,000 |
| British thermal units (BTU) | 3,412.142 |
When you need to convert watt-hours to kilowatt-hours
Batteries for phones, power banks, e-bikes and home storage are rated in watt-hours or milliamp-hours, while your electricity bill and solar systems use kilowatt-hours. Converting helps you compare battery capacity with how much energy you buy.
About the units
Watt-hour (Wh)
A watt-hour is the energy used by a one-watt device in an hour, exactly 3,600 joules. Battery capacities are often given in Wh.
Kilowatt-hour (kWh)
A kilowatt-hour is the energy used by a 1,000-watt device in one hour, exactly 3.6 million joules. It is the unit electricity is billed in.
Frequently asked questions
How do I convert watt-hours to kilowatt-hours?
Multiply the number of watt-hours by 0.001. For example, 10 watt-hours × 0.001 = 0.01 kilowatt-hours.
How many kilowatt-hours are in one watt-hour?
There are 0.001 kilowatt-hours in one watt-hour.
How many watt-hours are in one kilowatt-hour?
There are 1,000 watt-hours in one kilowatt-hour.
How many watt-hours is a 10,000 mAh power bank?
At a typical cell voltage of 3.7 V, a 10,000 mAh power bank stores about 37 Wh (10 Ah × 3.7 V), which is 0.037 kWh.
Can I convert other energy units with this tool?
Yes. Use the From and To drop-downs in the converter to choose any energy unit, or press the swap button to reverse the conversion. All calculations use internationally defined conversion factors.