Convert energy between joules, calories, kWh, BTU and more.
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Understanding your result
Food “Calories” are kilocalories; one Calorie equals 1000 of these calories.
Formula and method
Each unit converts through joules: the value is multiplied by its factor to joules, then divided by the target factor (1 kWh = 3,600,000 J).
Worked example
1 kWh equals 3,600,000 joules or about 3,412 BTU.
How to use this tool
- Enter a value and choose the from and to units.
- The result updates instantly.
Common mistakes to avoid
- Confusing calorie (cal) with food Calorie (kcal).
About the Energy Converter
Convert an energy value between joules, calories, watt-hours, kilowatt-hours and BTU.
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Frequently asked questions
How many joules in a kWh?
Exactly 3,600,000 joules.