How does the Calories to Joules work?

1 kcal (food Calorie) = 4,184 joules Then: 1 small calorie = 4.184 joules Then: Joules = kcal × 4,184 Then: EU food labels use kJ (kilojoules).

Can you give an example of how to use the Calories to Joules?

Example: Input 100 kcal (food portion) gives a result of 418,400 joules = 418.4 kJ.

Is the Calories to Joules free to use?

Yes — completely free with no registration, download, or subscription required. All calculations happen instantly in your browser.

How accurate is the Calories to Joules?

Our Calories to Joules uses verified mathematical formulas and is accurate to multiple decimal places. Results are calculated in real-time using the same methods used by professionals.

Is this Calories to Joules medically accurate?

This tool uses clinically recognised formulas for general information and educational purposes. It is not a substitute for professional medical advice. Always consult a qualified healthcare provider for medical decisions.

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Calories to Joules

Energy Converter

Calories (cal)

A calories to joules converter converts food energy (Calories/kcal) or thermodynamic calories to joules, the SI unit of energy. Used in physics, chemistry, and international nutrition labelling.

Symbol	Name	Unit	Description
cal	Calories	cal	Small calorie (gram calorie)
kcal	Kilocalories	kcal	Food Calorie (kilogram calorie)
J	Joules	J	SI unit of energy

kcal	kJ	Food Example
50	209	Apple
100	418	Banana
200	837	Slice of bread
500	2,092	Small meal
2,000	8,368	Daily intake
2,500	10,460	Active adult

References

›EU food energy labelling — EFSA

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