Calories to Kilojoules Converter
Convert between kcal, kJ, cal, and J instantly. Useful for reading nutrition labels and tracking dietary energy.
100% client-side · no upload
How to use
- Enter the energy value you want to convert.
- Select the source unit: kcal, kJ, cal, or J.
- Click Convert to see the energy in all four units simultaneously.
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- Kilograms to Pounds — weight converter for nutrition
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よくある質問
- Is this calories to kJ converter free?
- Yes, completely free with no signup and no usage limits.
- Does my data leave my device?
- No. All calculations run in JavaScript inside your browser. Nothing is sent to any server.
- Does it work on mobile?
- Yes. The converter is mobile-first and works on iPhone Safari and Android Chrome.