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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.
Formel
J = cal × 4.184; J = kcal × 4,184
- cal
- Calories (cal) — Small calorie (gram calorie)
- kcal
- Kilocalories (kcal) — Food Calorie (kilogram calorie)
- J
- Joules (J) — SI unit of energy
Trinn-for-trinn guide
- 11 kcal (food Calorie) = 4,184 joules
- 21 small calorie = 4.184 joules
- 3Joules = kcal × 4,184
- 4EU food labels use kJ (kilojoules)
Løste eksempler
Inndata
100 kcal (food portion)
Resultat
418,400 joules = 418.4 kJ
Inndata
2,000 kcal (daily intake)
Resultat
8,368,000 joules = 8,368 kJ
Inndata
1 calorie (small)
Resultat
4.184 joules
Ofte stilte spørsmål
How many joules in a food label calorie?
One food Calorie on a label (which is really 1 kcal) = 4,184 joules. A 100-calorie snack = 418,400 joules.
Why use two different calorie definitions?
Confusion arises because food labels use kcal but write "calories" without the "kilo". Scientists prefer joules to avoid ambiguity.
How much energy do I burn exercising?
Varies by activity and person. Running for 30 min might burn 300–500 food calories (1.26–2.09 million joules).
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