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A joules to calories converter converts the SI unit of energy (joules) to the calorie, commonly used in food energy labelling and nutrition. One food Calorie (kcal) = 4,184 joules.
Formula
cal = J × 0.239006; kcal = J × 0.000239006
- J
- Joules (J) — SI unit of energy
- cal
- Calories (cal) — Small calorie; 1 cal = 4.184 J
- kcal
- Kilocalories (kcal) — Dietary calorie; 1 kcal = 4,184 J (note: food labels use kcal but call it "calories")
Guida passo passo
- 11 calorie (small) = 4.184 joules
- 21 Calorie (food/kcal) = 4,184 joules
- 3cal = joules ÷ 4.184
- 4kcal = joules ÷ 4,184
Esempi risolti
Ingresso
4,184 joules
Risultato
1,000 calories = 1 kcal (food Calorie)
Ingresso
1,000,000 joules
Risultato
239.0 kcal
Ingresso
100 joules
Risultato
23.9 calories
Domande frequenti
What is the difference between calories and kilocalories?
1 kilocalorie (kcal or food Calorie) = 1,000 small calories. Food labels use kcal but write "calories" — always clarify which unit is meant.
How many joules in a food calorie?
1 food Calorie (kcal) = 4,184 joules. A 2,000 kcal diet = 8,368,000 joules of energy.
Why do scientists use joules?
Joules are SI units (international standard). Calories are historical and vary slightly by definition. Science uses joules; nutrition uses kcal.
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