Kilojoules to Kilowatt-hours Converter
Convert kilojoules to kilowatt-hours instantly with this free kilojoules to kilowatt-hours converter. Enter any value to get an accurate energy conversion, plus the formula, the conversion factor and a full reference table.
What is 1 kilojoule in kilowatt-hours?
1 kilojoule is equal to 0.000277778 kilowatt-hours.
1 ÷ 3,600 = 0.000277778 kilowatt-hours
1 kilojoule = 0.0002777778 kilowatt-hours
Kilojoules to Kilowatt-hours formula
kWh = kJ ÷ 3,600
The kilojoules to kilowatt-hours conversion factor is 0.000277777778, which is exact by definition. 1 kilojoule = 0.000277777778 kilowatt-hours, and 1 kilowatt-hour = 3,600 kilojoules.
Worked examples
- 2 kilojoules = 0.000555556 kilowatt-hours — 2 ÷ 3,600 = 0.000555556 kilowatt-hours
- 6 kilojoules = 0.001666667 kilowatt-hours — 6 ÷ 3,600 = 0.001666667 kilowatt-hours
- 10 kilojoules = 0.002777778 kilowatt-hours — 10 ÷ 3,600 = 0.002777778 kilowatt-hours
Kilojoules to Kilowatt-hours conversion table
Every value below is calculated with the exact conversion factor and rounded for display.
| Kilojoules (kJ) | Kilowatt-hours (kWh) |
|---|---|
| 1 kJ | 0.00027778 kWh |
| 2 kJ | 0.00055556 kWh |
| 3 kJ | 0.00083333 kWh |
| 4 kJ | 0.00111111 kWh |
| 5 kJ | 0.00138889 kWh |
| 6 kJ | 0.00166667 kWh |
| 7 kJ | 0.00194444 kWh |
| 8 kJ | 0.00222222 kWh |
| 9 kJ | 0.0025 kWh |
| 10 kJ | 0.00277778 kWh |
| 12 kJ | 0.00333333 kWh |
| 15 kJ | 0.00416667 kWh |
| 20 kJ | 0.00555556 kWh |
| 25 kJ | 0.00694444 kWh |
| 30 kJ | 0.00833333 kWh |
| 50 kJ | 0.01388889 kWh |
| 75 kJ | 0.02083333 kWh |
| 100 kJ | 0.02777778 kWh |
| 500 kJ | 0.13888889 kWh |
| 1,000 kJ | 0.27777778 kWh |
When you need to convert kilojoules to kilowatt-hours
- Comparing food energy labelled in calories with labels in kilojoules.
- Reading utility bills and appliance ratings that mix kWh, joules and BTU.
Common mistakes to avoid
- Dividing when you should multiply. Because 1 kilojoule = 0.000278 kilowatt-hours, the answer should be smaller than the number you started with.
- Rounding too early. Convert first at full precision, then round the final answer to the precision the task actually needs.
How precise does the answer need to be?
Round only at the end, and only to the precision your task actually needs. The converter above keeps full double precision internally and rounds for display.
How these units are defined
- Kilojoule (kJ): 1,000 joules; food energy labelling in Australia and New Zealand. This unit's relationship to the SI base unit is exact by definition, so no rounding enters the conversion factor.
- Kilowatt-hour (kWh): The billing unit for household electricity. This unit's relationship to the SI base unit is exact by definition, so no rounding enters the conversion factor.
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Frequently asked questions
- What is 1 kilojoule in kilowatt-hours?
- 1 kilojoule is equal to 0.000277778 kilowatt-hours.
- How many kilojoules are in one kilowatt-hour?
- There are 3,600 kilojoules in 1 kilowatt-hour.
- How do you convert kilojoules to kilowatt-hours?
- Multiply the number of kilojoules by 0.000277778 — or use the formula kWh = kJ ÷ 3,600.
- What is 6 kilojoules in kilowatt-hours?
- 6 kilojoules is 0.001666667 kilowatt-hours. 6 ÷ 3,600 = 0.001666667 kilowatt-hours.
- Is the kilojoules to kilowatt-hours conversion exact?
- Yes. The relationship is fixed by definition, so 0.000277777778 is an exact conversion factor — only the displayed result is rounded.