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Convert kilocalories to kilojoules
Instant, accurate kcal → kJ conversion with a live converter, table and formula.
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1 kilocalorie = 4.184 kilojoules
1 kilojoule = 0.239006 kilocalories
kilocalories to kilojoules table
| kilocalories (kcal) | kilojoules (kJ) |
|---|---|
| 0.5 | 2.092 |
| 1 | 4.184 |
| 2 | 8.368 |
| 5 | 20.92 |
| 10 | 41.84 |
| 20 | 83.68 |
| 50 | 209.2 |
| 100 | 418.4 |
| 500 | 2092 |
| 1000 | 4184 |
Formula
kilojoules = kilocalories × 4.184.
Example
10 kilocalories = 41.84 kilojoules.
What is a kilocalorie?
A kilocalorie (kcal) is 1,000 calories — the 'Calorie' on food labels.
What is a kilojoule?
A kilojoule (kJ) is 1,000 joules; food energy is often labeled in kJ.
Real-world reference points
A food Calorie is a kilocalorie: an apple is ~52 kcal, a daily diet ~2,000 kcal (~8.4 MJ).
| Reference | kilocalories | kilojoules |
|---|---|---|
| AA battery | 3.68 kcal | 15.39 kJ |
| Smartphone battery (13 Wh) | 11.19 kcal | 46.8 kJ |
| Apple (52 kcal) | 52 kcal | 218 kJ |
| Daily diet (2,000 kcal) | 2,000 kcal | 8,368 kJ |
| 1 kWh (unit of electricity) | 860 kcal | 3,600 kJ |
Mistakes to avoid with energy conversions
- Food 'Calories' are kilocalories — mixing cal and kcal creates 1000× errors.
- Confusing kWh (energy) with kW (power) on bills and appliance labels.
- Comparing battery mAh across different voltages — energy needs Wh, not mAh alone.
Frequently asked questions
How many kilojoules in a kilocalories?+
1 kilocalorie = 4.184 kilojoules.
How do I convert kilocalories to kilojoules?+
Enter the value in the kilocalories box above and the kilojoules value appears instantly. You can also type in the kilojoules box to convert the other way.
Is this kcal to kJ converter free?+
Yes — it is 100% free, needs no sign-up, and runs entirely in your browser.