Joule to Kilocalorie
Convert J to kcal instantly — free, no sign-up.
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About the Joule (J)
The Joule is the SI unit of energy, defined as the work done by one newton of force over one meter — a single joule is roughly the energy released dropping an apple one meter.
About the Kilocalorie (kcal)
The Kilocalorie is equal to 1,000 small calories — this is what a food label actually means by "Calories" (capital C), the standard unit for dietary energy in the US.
How to convert J to kcal
- Enter the value in J in the box above.
- The kcal equivalent updates instantly.
- Use the swap button to convert kcal back to J just as easily.