Calories to Kcal Converter
Convert calories to kilocalories instantly. Free calorie to kcal converter for nutrition.
Formula
kcal = cal × 0.001
Common Conversions
Calories vs Kilocalories - the Confusion Cleared
1 kcal = 1,000 calories. The 'calorie' on a food label (US) is actually a kilocalorie scientifically. So 100 'food calories' = 100 kcal = 100,000 small calories (cal). Divide calories by 1,000 to get kcal. The capital C in 'Calorie' historically signalled kcal, but most American food labels just say 'calorie' meaning kcal.
Most useful for understanding scientific vs nutritional contexts. A 100 cal physics calculation = 0.1 kcal. A 100 'calorie' food label = 100 kcal = 418 kJ. Always check whether a 'calorie' is the small (cal) or large (kcal) variety. Most everyday usage means kcal; most physics texts mean cal.
Calories to Kcal
| Calories (cal) | Kilocalories (kcal) |
|---|---|
| 1 cal | 0.001 kcal |
| 100 cal | 0.1 kcal |
| 1000 cal | 1 kcal |
| 5000 cal | 5 kcal |
| 10000 cal | 10 kcal |
| 100000 cal | 100 kcal |
| 1000000 cal | 1000 kcal |
| 2000000 cal | 2000 kcal (daily) |
Frequently Asked Questions
Is a 'food calorie' really a kcal?
Yes. A US 'calorie' on food labels is technically a kilocalorie (kcal). The capital C convention was meant to distinguish them but it's not consistently used. Practical rule: 'calorie' in food/nutrition = kcal; 'calorie' in physics/chemistry = small cal.
When does the small calorie matter?
Mostly in physics, chemistry, and engineering. Heat capacity (4.184 J/cal), thermodynamics, and certain industrial processes. Everyday nutrition uses kcal exclusively, even when the label just says 'calories'.
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