Energy converter
Convert joules, calories, kWh, BTU and more
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How to use it
- Enter your numbers.
- The result updates as you type.
- Change any value to see a different outcome.
Questions
How many kilojoules are in a calorie?
A food Calorie (kcal) is 4.184 kilojoules. So 100 kcal is 418.4 kJ.
Is anything I enter stored?
No. Calculations happen in your browser and nothing you type is sent or saved.
Is it free?
Yes, you can use it for free. A subscription removes limits and unlocks premium tools.