Convert kilojoules to kilowatt-hours
Converting kilojoules to kilowatt-hours is a common energy task, whether you are checking a recipe, a spec sheet, a travel distance or a homework problem. Since 1 kJ equals 0.000277778 kWh, the math is a single multiplication — and this page does it for you instantly, with the formula, a table of common values and answers to the questions people ask most.
Exact factor
How to convert kilojoules to kilowatt-hours
To convert kilojoules to kilowatt-hours, multiply the number of kilojoules by 0.000277778. For example, 10 kJ × 0.000277778 = 0.00277778 kWh.
kWh = kJ × 0.000277778
- Write down the value in kilojoules you want to convert.
- Multiply it by 0.000277778 (the exact kJ→kWh factor).
- The result is your value in kilowatt-hours. Check it below with the converter or the table.
Conversion table
Common values of kilojoules and their equivalents in kilowatt-hours:
| kJ | kWh |
|---|---|
| 1 | 0.000277778 |
| 2 | 0.000555556 |
| 3 | 0.000833333 |
| 4 | 0.00111111 |
| 5 | 0.00138889 |
| 10 | 0.00277778 |
| 20 | 0.00555556 |
| 25 | 0.00694444 |
| 50 | 0.0138889 |
| 100 | 0.0277778 |
| 250 | 0.0694444 |
| 500 | 0.138889 |
About these units
Kilojoule (kJ). A kilojoule is 1,000 joules, the practical unit for food energy in Australia and Europe and for mechanical work. One kilocalorie equals 4.184 kilojoules.
Kilowatt-hour (kWh). A kilowatt-hour is the energy delivered by one kilowatt over one hour, exactly 3.6 million joules. Household electricity bills and EV batteries are measured in kWh.
Frequently asked questions
How do I convert kilojoules to kilowatt-hours?
To convert kilojoules to kilowatt-hours, multiply the number of kilojoules by 0.000277778. For example, 10 kJ × 0.000277778 = 0.00277778 kWh. Or skip the math: type the value into the converter at the top of this page and the result updates instantly.
How many kilowatt-hours are in 1 kilojoule?
1 kJ = 0.000277778 kWh. That is the fixed relationship used by this converter and by international standards.
How many kilojoules are in 1 kilowatt-hour?
1 kWh = 3,600 kJ. If you are converting in the opposite direction, use our Kilowatt-hour to Kilojoule converter for the dedicated table and FAQ.
Is the kilojoules to kilowatt-hours conversion exact?
Yes. Both units are defined by international agreement, so the factor of 0.000277778 is exact. Displayed results are rounded to 6 significant digits only for readability.
What is kilojoule used for?
A kilojoule is 1,000 joules, the practical unit for food energy in Australia and Europe and for mechanical work. One kilocalorie equals 4.184 kilojoules.