How to use
- Enter the amount of energy.
- Choose the unit to convert from and to.
- Read the result, or the table of every energy unit below.
Options explained
- kcal and kJ
- 1 kcal = 4.184 kJ (the thermochemical calorie used in nutrition). The food “Calorie” with a capital C is a kilocalorie.
- Kilowatt-hours
- 1 kWh = 3,600 kJ ≈ 860 kcal.
Examples
| Value | Converts to |
|---|---|
| 1 kcal | 4.184 kJ |
| 1 kWh | 3,600 kJ ≈ 860.42 kcal |
| 1 BTU | 1.055 kJ |
Frequently asked questions
How many Calories is 2,000 kJ?
About 478 kcal. Divide kilojoules by 4.184 to get kilocalories.
Is a Calorie the same as a kilocalorie?
Yes. Food labels’ Calorie (capital C) is 1 kcal = 1,000 small calories.
How much energy is 1 kWh?
3.6 MJ, or about 860 kcal.
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