Watt-hour to Kilojoule Converter
Convert watt-hours to kilojoules with this free energy converter. The exact relationship used on this page is 1 watt-hour = 3.6 kilojoules. 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: Kilojoule = Watt-hour × 3.6
How to convert watt-hours to kilojoules
- Enter the value in watt-hours in the converter.
- Read the equivalent amount in kilojoules.
- Use the swap link if you need kilojoule to watt-hour instead.
- Check the table for common values without typing.
Worked examples
- 1 Wh = 3.6 kJ
- 5 Wh = 18 kJ
- 10 Wh = 36 kJ
- 25 Wh = 90 kJ
Conversion table
Common watt-hours values converted to kilojoules.
| Wh | kJ |
|---|---|
| 1 | 3.6 |
| 2 | 7.2 |
| 3 | 10.8 |
| 4 | 14.4 |
| 5 | 18 |
| 6 | 21.6 |
| 7 | 25.2 |
| 8 | 28.8 |
| 9 | 32.4 |
| 10 | 36 |
| 20 | 72 |
| 50 | 180 |
| 100 | 360 |
| 250 | 900 |
| 500 | 1,800 |
| 1,000 | 3,600 |
About this conversion
Watt-hour (Wh) and Kilojoule (kJ) are both energy units. Energy converters connect food labels (kcal), electricity bills (kWh), physics (joules), and heating (BTU). Bookmark this URL when you convert watt-hours to kilojoules often, then explore related pairs in the same category if you need a different target unit.
Need the other direction? Open the kilojoule to watt-hour converter.
FAQ
How many kilojoules are in 1 watt-hour?+
1 watt-hour equals 3.6 kilojoules.
What is the formula to convert watt-hours to kilojoules?+
Kilojoule = Watt-hour × 3.6
How do I convert watt-hours to kilojoules by hand?+
Multiply the watt-hour value by 3.6. Example: 10 watt-hours × 3.6 = 36 kilojoules.
Is this Wh to kJ 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.