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Convert kilojoules to kilocalories
Instant, accurate kJ → kcal conversion with a live converter, table and formula.
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1 kilojoule = 0.239006 kilocalories
1 kilocalorie = 4.184 kilojoules
kilojoules to kilocalories table
| kilojoules (kJ) | kilocalories (kcal) |
|---|---|
| 0.5 | 0.119503 |
| 1 | 0.239006 |
| 2 | 0.478011 |
| 5 | 1.19503 |
| 10 | 2.39006 |
| 20 | 4.78011 |
| 50 | 11.9503 |
| 100 | 23.9006 |
| 500 | 119.503 |
| 1000 | 239.006 |
Formula
kilocalories = kilojoules × 0.239006.
Example
10 kilojoules = 2.39006 kilocalories.
What is a kilojoule?
A kilojoule (kJ) is 1,000 joules; food energy is often labeled in kJ.
What is a kilocalorie?
A kilocalorie (kcal) is 1,000 calories — the 'Calorie' on food labels.
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 | kilojoules | kilocalories |
|---|---|---|
| AA battery | 15.39 kJ | 3.68 kcal |
| Smartphone battery (13 Wh) | 46.8 kJ | 11.19 kcal |
| Apple (52 kcal) | 218 kJ | 52 kcal |
| Daily diet (2,000 kcal) | 8,368 kJ | 2,000 kcal |
| 1 kWh (unit of electricity) | 3,600 kJ | 860 kcal |
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 kilocalories in a kilojoules?+
1 kilojoule = 0.239006 kilocalories.
How do I convert kilojoules to kilocalories?+
Enter the value in the kilojoules box above and the kilocalories value appears instantly. You can also type in the kilocalories box to convert the other way.
Is this kJ to kcal converter free?+
Yes — it is 100% free, needs no sign-up, and runs entirely in your browser.