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Energy
Kilowatt-hours to Kilojoules
Convert kilowatt-hours (kWh) to kilojoules (kJ). Type a value below to see the result update instantly. Reference table and formula included.
Calculator
1 kWh = 3600 kJ
Kilowatt-hours to Kilojoules Conversion Table
Common values, ready to copy:
| kilowatt-hours | kilojoules |
|---|---|
| 1 kWh | 3600 kJ |
| 2 kWh | 7200 kJ |
| 5 kWh | 18000 kJ |
| 10 kWh | 36000 kJ |
| 25 kWh | 90000 kJ |
| 50 kWh | 180000 kJ |
| 100 kWh | 360000 kJ |
| 1,000 kWh | 3.6000e+6 kJ |
Formula
kilojoules = kilowatt-hours × 3600
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 Kilowatt-hours and Kilojoules
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.
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).
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 kilojoules = kilowatt-hours × 3600, 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 kilowatt-hours and kilojoules 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.