Convert between kilocalories (kcal) and kilojoules (kJ) for food nutrition, diet planning, and fitness tracking.
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kcal to kJ Conversion:
1 Kilocalorie (kcal) = 4.184 Kilojoules (kJ)
kJ = kcal × 4.184 | kcal = kJ ÷ 4.184 (e.g., 100 kcal = 418.4 kJ)
Accepts decimals (e.g., 150.5 kcal = 629.692 kJ)
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Quick conversions (common food energy) - click to auto-fill:
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Key differences between kilocalories (kcal) and kilojoules (kJ) — and their real-world uses
| Unit | Definition | 1 Unit = | Common Uses |
|---|---|---|---|
| Kilocalorie (kcal) | Energy to heat 1kg water by 1°C (food "calorie") | 4.184 kJ 1000 small calories (cal) |
US food labels, diet apps, fitness trackers |
| Kilojoule (kJ) | Energy to move 1kg 1m with 1 newton force (SI unit) | 0.239 kcal 1000 joules (J) |
Global food labels (EU/Asia/AU), science, engineering |
| Food Item (1 serving) | Kilocalories (kcal) | Kilojoules (kJ) | Notes |
|---|---|---|---|
| Medium apple (~150g) | 100 kcal | 418.4 kJ | Fresh, unpeeled |
| Cooked rice (~150g) | 239 kcal | 1000 kJ | Long-grain, white |
| Hard-boiled egg (~50g) | 78 kcal | 326.35 kJ | Medium-sized |
| Cheeseburger (fast-food) | 500 kcal | 2092 kJ | With beef patty & cheese |
| Coca-Cola (330ml can) | 139 kcal | 581.6 kJ | Regular (not diet) |
Common energy conversions for food, diet, and fitness tracking
| Kilocalories (kcal) | = | Kilojoules (kJ) |
|---|---|---|
| 50 kcal | = | 209.2 kJ |
| 100 kcal | = | 418.4 kJ |
| 200 kcal | = | 836.8 kJ |
| 500 kcal | = | 2092 kJ |
| 1000 kcal | = | 4184 kJ |
| Kilojoules (kJ) | = | Kilocalories (kcal) |
|---|---|---|
| 200 kJ | = | 47.8 kcal |
| 500 kJ | = | 119.5 kcal |
| 1000 kJ | = | 239.0 kcal |
| 2000 kJ | = | 478.0 kcal |
| 5000 kJ | = | 1195.0 kcal |
Common questions about kcal to kJ conversions
The 4.184 factor comes from the scientific definition of a kilocalorie:
Yes! The "Calorie" (capital C) you see on food labels is actually a kilocalorie (kcal):
For most people, rounding to 1-2 decimal places is sufficient:
It depends on regional standards and historical adoption:
Yes — the conversion works for any energy measurement, including exercise burn:
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Convert kilojoules (kJ) to kilocalories (kcal) for food, diet, and fitness tracking—1 kcal = 4.184 kJ.
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Convert kcal to kJ (kilocalories to kilojoules) for food nutrition, diet, and fitness—1 kcal = 4.184 kJ.
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