joules to kilowatt-hours
Convert joule to kilowatt-hour — instant, free, with the formula shown.
1 J=2.7778e-7 kWh
How to convert joule to kilowatt-hour
To convert joule to kilowatt-hour, multiply by 2.7778e-7:
kWh = J × 2.7778e-7
For example, 10 J × 2.7778e-7 = 2.7778e-6 kWh.
J to kWh conversion table
| joules (J) | kilowatt-hours (kWh) |
|---|---|
| 1 J | 2.7778e-7 kWh |
| 2 J | 5.5556e-7 kWh |
| 5 J | 1.3889e-6 kWh |
| 10 J | 2.7778e-6 kWh |
| 25 J | 6.9444e-6 kWh |
| 50 J | 1.3889e-5 kWh |
| 100 J | 2.7778e-5 kWh |
| 250 J | 6.9444e-5 kWh |
| 500 J | 0.000139 kWh |
| 1000 J | 0.000278 kWh |
Other joule conversions
Convert to kilowatt-hour from another unit
J to kWh — frequently asked
How many kilowatt-hours are in 1 joule?
1 joule = 2.7778e-7 kilowatt-hours (J × 2.7778e-7 = kWh).
What is the formula to convert joule to kilowatt-hour?
Multiply your joule value by 2.7778e-7 to get kilowatt-hour.
How do I convert 10 joules to kilowatt-hours?
10 J = 2.7778e-6 kWh. For 100 J the answer is 2.7778e-5 kWh. Use the calculator on this page for any other value.
When to convert joule to kilowatt-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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