Kilojoule to Watt-hour Converter
Convert kilojoules to watt-hours with this free energy converter. The exact relationship used on this page is 1 kilojoule = 0.277777777778 watt-hours. Type any number — the result updates instantly, works on phones and desktops, and is ready to copy into homework, a spec sheet, or a shopping list.
Formula: Watt-hour = Kilojoule × 0.277777777778
How to convert kilojoules to watt-hours
- Enter the value in kilojoules in the converter.
- Read the equivalent amount in watt-hours.
- Use the swap link if you need watt-hour to kilojoule instead.
- Check the table for common values without typing.
Worked examples
- 1 kJ = 0.2777777778 Wh
- 5 kJ = 1.388888889 Wh
- 10 kJ = 2.777777778 Wh
- 25 kJ = 6.944444444 Wh
Conversion table
Common kilojoules values converted to watt-hours.
| kJ | Wh |
|---|---|
| 1 | 0.2777777778 |
| 2 | 0.5555555556 |
| 3 | 0.8333333333 |
| 4 | 1.111111111 |
| 5 | 1.388888889 |
| 6 | 1.666666667 |
| 7 | 1.944444444 |
| 8 | 2.222222222 |
| 9 | 2.5 |
| 10 | 2.777777778 |
| 20 | 5.555555556 |
| 50 | 13.88888889 |
| 100 | 27.77777778 |
| 250 | 69.44444444 |
| 500 | 138.8888889 |
| 1,000 | 277.7777778 |
About this conversion
Kilojoule (kJ) and Watt-hour (Wh) are both energy units. Energy converters connect food labels (kcal), electricity bills (kWh), physics (joules), and heating (BTU). Bookmark this URL when you convert kilojoules to watt-hours often, then explore related pairs in the same category if you need a different target unit.
Need the other direction? Open the watt-hour to kilojoule converter.
FAQ
How many watt-hours are in 1 kilojoule?+
1 kilojoule equals 0.277777777778 watt-hours.
What is the formula to convert kilojoules to watt-hours?+
Watt-hour = Kilojoule × 0.277777777778
How do I convert kilojoules to watt-hours by hand?+
Multiply the kilojoule value by 0.277777777778. Example: 10 kilojoules × 0.277777777778 = 2.77777777778 watt-hours.
Is this kJ to Wh converter accurate?+
Yes. Linear conversions use internationally agreed factors relative to SI. Temperature and inverse fuel units use the standard offset or reciprocal formulas, not a guessed scale factor.