如何计算Calories to Joules
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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.
公式
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
分步指南
- 11 kcal (food Calorie) = 4,184 joules
- 21 small calorie = 4.184 joules
- 3Joules = kcal × 4,184
- 4EU food labels use kJ (kilojoules)
例题解析
输入
100 kcal (food portion)
结果
418,400 joules = 418.4 kJ
输入
2,000 kcal (daily intake)
结果
8,368,000 joules = 8,368 kJ
输入
1 calorie (small)
结果
4.184 joules
常见问题
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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