Kilocalories to Calories Converter (kcal to cal)
Convert kilocalories to calories (kcal to cal). Clarifies the confusing Calorie vs calorie naming on US food labels. See results in calories, kilojoules, and BTU.
ENERGY IN CALORIES
2,000,000 cal
FOOD CALORIES
2,000 Cal
KILOJOULES
8368.0 kJ
BTU
7936.6
FORMULA
2000Γ1,000
Kilocalories to Calories β Quick Reference
| kcal | cal | kJ | US Food Context |
|---|---|---|---|
| 1 kcal | 1,000 cal | 4 kJ | 1 stick of gum |
| 5 kcal | 5,000 cal | 21 kJ | Cup of black coffee |
| 10 kcal | 10,000 cal | 42 kJ | 1 celery stalk |
| 50 kcal | 50,000 cal | 209 kJ | 1 medium apple |
| 100 kcal | 100,000 cal | 418 kJ | 1 slice of bread |
| 200 kcal | 200,000 cal | 837 kJ | 1 candy bar |
| 500 kcal | 500,000 cal | 2092 kJ | Fast food burger |
| 1,000 kcal | 1,000,000 cal | 4184 kJ | Large restaurant meal |
| 2,000 kcal | 2,000,000 cal | 8368 kJ | Daily recommended (avg) |
| 3,000 kcal | 3,000,000 cal | 12552 kJ | Active adult / athlete |
How to Convert Kilocalories to Calories
Multiply by 1,000:
Example: 200 kcal (candy bar)
= 200 Γ 1,000 = 200,000 calories
Example: 2,000 kcal (daily recommended intake)
= 2,000 Γ 1,000 = 2,000,000 calories
Example: 500 kcal (fast food burger)
= 500 Γ 1,000 = 500,000 calories
β οΈ The Calorie Confusion β What Americans Need to Know
This is one of the most confusing unit conversions in science because of how the US uses the word "Calorie":
| Term | Symbol | Definition | Where You See It |
|---|---|---|---|
| calorie (small c) | cal | Energy to heat 1g water by 1Β°C | Chemistry, physics |
| Calorie (capital C) | Cal | = 1 kilocalorie (kcal) = 1,000 cal | US food labels, nutrition |
| kilocalorie | kcal | = 1,000 calories = 1 Cal | International nutrition, science |
Bottom line: When a US food label says "200 Calories," it means 200 kcal = 200,000 small calories. The "Calorie" on American food labels is always a kilocalorie.
Common US Foods β kcal to cal
| Food | kcal (=Cal) | cal (small) | kJ |
|---|---|---|---|
| 1 stick of gum | 5 kcal | 5,000 cal | 21 kJ |
| 1 medium apple | 95 kcal | 95,000 cal | 397 kJ |
| 1 egg | 78 kcal | 78,000 cal | 326 kJ |
| 1 slice of pizza | 285 kcal | 285,000 cal | 1,192 kJ |
| Chicken breast (6 oz) | 280 kcal | 280,000 cal | 1,171 kJ |
| Big Mac | 550 kcal | 550,000 cal | 2,301 kJ |
| Starbucks Grande Latte | 190 kcal | 190,000 cal | 795 kJ |
| Chipotle burrito | 1,000 kcal | 1,000,000 cal | 4,184 kJ |
Macronutrient Energy Values (The 4-4-9 Rule)
| Macronutrient | kcal per gram | cal per gram | kJ per gram |
|---|---|---|---|
| Protein | 4 kcal/g | 4,000 cal/g | 16.7 kJ/g |
| Carbohydrates | 4 kcal/g | 4,000 cal/g | 16.7 kJ/g |
| Fat | 9 kcal/g | 9,000 cal/g | 37.7 kJ/g |
| Alcohol | 7 kcal/g | 7,000 cal/g | 29.3 kJ/g |
| Fiber | ~2 kcal/g | ~2,000 cal/g | ~8.4 kJ/g |
US Daily Calorie Recommendations
| Group | Activity | kcal/day | cal/day |
|---|---|---|---|
| Women 19β30 | Sedentary | 1,800β2,000 | 1.8β2.0 million |
| Women 19β30 | Active | 2,200β2,400 | 2.2β2.4 million |
| Men 19β30 | Sedentary | 2,200β2,400 | 2.2β2.4 million |
| Men 19β30 | Active | 2,800β3,200 | 2.8β3.2 million |
| Children 4β8 | Moderate | 1,400β1,600 | 1.4β1.6 million |
| Teens 14β18 | Active | 2,400β3,200 | 2.4β3.2 million |
What Is a Kilocalorie (kcal)?
Kilocalorie (kcal) = 1,000 calories = the energy needed to raise 1 kilogram (1 liter) of water by 1Β°C. In the US, this is exactly what food labels call a "Calorie" (capital C). International food labels use "kcal" directly, which is more technically accurate.
What Is a Calorie (cal)?
Calorie (cal, small c) = the energy needed to raise 1 gram of water by 1Β°C. It's a very small unit β too small for nutrition. That's why food uses kilocalories (1,000 cal). The US FDA chose to label food energy as "Calories" (capital C) instead of "kilocalories" to keep labels simpler, creating the ongoing confusion.