kilojoules to watt-hours
Convert kilojoule to watt-hour — instant, free, with the formula shown.
1 kJ=0.277778 Wh
How to convert kilojoule to watt-hour
To convert kilojoule to watt-hour, multiply by 0.27777778:
Wh = kJ × 0.27777778
For example, 10 kJ × 0.277778 = 2.777778 Wh.
kJ to Wh conversion table
| kilojoules (kJ) | watt-hours (Wh) |
|---|---|
| 1 kJ | 0.277778 Wh |
| 2 kJ | 0.555556 Wh |
| 5 kJ | 1.388889 Wh |
| 10 kJ | 2.777778 Wh |
| 25 kJ | 6.944444 Wh |
| 50 kJ | 13.888889 Wh |
| 100 kJ | 27.777778 Wh |
| 250 kJ | 69.444444 Wh |
| 500 kJ | 138.888889 Wh |
| 1000 kJ | 277.777778 Wh |
Other kilojoule conversions
Convert to watt-hour from another unit
kJ to Wh — frequently asked
How many watt-hours are in 1 kilojoule?
1 kilojoule = 0.277778 watt-hours (kJ × 0.277778 = Wh).
What is the formula to convert kilojoule to watt-hour?
Multiply your kilojoule value by 0.27777778 to get watt-hour.
How do I convert 10 kilojoules to watt-hours?
10 kJ = 2.777778 Wh. For 100 kJ the answer is 27.777778 Wh. Use the calculator on this page for any other value.
When to convert kilojoule to watt-hour
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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