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Energy
Kilojoules to Kilowatt-hours
Convert kilojoules (kJ) to kilowatt-hours (kWh). Type a value below to see the result update instantly. Reference table and formula included.
Calculator
1 kJ = 0.000278 kWh
Kilojoules to Kilowatt-hours Conversion Table
Common values, ready to copy:
| kilojoules | kilowatt-hours |
|---|---|
| 1 kJ | 0.000278 kWh |
| 2 kJ | 0.000556 kWh |
| 5 kJ | 0.001389 kWh |
| 10 kJ | 0.002778 kWh |
| 25 kJ | 0.006944 kWh |
| 50 kJ | 0.013889 kWh |
| 100 kJ | 0.027778 kWh |
| 1,000 kJ | 0.277778 kWh |
Formula
kilowatt-hours = kilojoules × 2.77777778e-4
Energy uses the SI joule. Food calories (kcal) are 1,000 small calories: 1 kcal = 4,184 J. 1 kWh = 3.6 MJ = 3,600,000 J. 1 BTU = 1,055.06 J.
About Kilojoules and Kilowatt-hours
Kilojoules (kJ): A thousand joules; the practical SI energy unit for food and nutrition in metric countries. Common uses: Food energy labeling outside the US, electrical energy in kJ for small batteries, and biology (metabolism).
Kilowatt-hours (kWh): A thousand watt-hours, or 3.6 MJ; the standard utility billing unit for residential and commercial electricity. Common uses: Electricity bills, residential and EV battery capacity (a typical EV battery is 50-100 kWh), and home solar generation.
How the conversion works
Energy uses the SI joule. Food calories (kcal) are 1,000 small calories: 1 kcal = 4,184 J. 1 kWh = 3.6 MJ = 3,600,000 J. 1 BTU = 1,055.06 J.
The exact relationship is kilowatt-hours = kilojoules × 2.77777778e-4, which the calculator at the top of this page applies in both directions. Type into either field and the other updates immediately.
When this conversion matters
Converting between kilojoules and kilowatt-hours comes up wherever energy measurements move between systems — from one country's conventions to another's, from a scientific reference to a practical specification, or from one industry's working unit to another's. The calculator and reference table above cover the everyday range; for unusual values you can type any number into either field.