watt-hours to kilojoules
Convert watt-hour to kilojoule — instant, free, with the formula shown.
1 Wh=3.6 kJ
How to convert watt-hour to kilojoule
To convert watt-hour to kilojoule, multiply by 3.6:
kJ = Wh × 3.6
For example, 10 Wh × 3.6 = 36 kJ.
Wh to kJ conversion table
| watt-hours (Wh) | kilojoules (kJ) |
|---|---|
| 1 Wh | 3.6 kJ |
| 2 Wh | 7.2 kJ |
| 5 Wh | 18 kJ |
| 10 Wh | 36 kJ |
| 25 Wh | 90 kJ |
| 50 Wh | 180 kJ |
| 100 Wh | 360 kJ |
| 250 Wh | 900 kJ |
| 500 Wh | 1800 kJ |
| 1000 Wh | 3600 kJ |
Other watt-hour conversions
Convert to kilojoule from another unit
Wh to kJ — frequently asked
How many kilojoules are in 1 watt-hour?
1 watt-hour = 3.6 kilojoules (Wh × 3.6 = kJ).
What is the formula to convert watt-hour to kilojoule?
Multiply your watt-hour value by 3.6 to get kilojoule.
How do I convert 10 watt-hours to kilojoules?
10 Wh = 36 kJ. For 100 Wh the answer is 360 kJ. Use the calculator on this page for any other value.
When to convert watt-hour to kilojoule
1Electricity bills (kWh)
2Nutrition labels (kcal / food cal)
3HVAC and heating (BTU, therms)
4Physics and chemistry (J, eV)
Energy conversion — common questions
Is a food calorie the same as a calorie?
No — a food 'Calorie' (capital C) actually means 1 kilocalorie = 1,000 small calories = 4,184 J. Nutrition labels typically write 'cal' meaning kcal.
How many joules in 1 kWh?
1 kWh = 3,600,000 J (3.6 MJ). Because 1 kW × 1 hour = 1,000 W × 3,600 s = 3,600,000 J.
What is a BTU?
British Thermal Unit — the energy required to raise 1 pound of water by 1 °F. 1 BTU ≈ 1,055 J.
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