How to use kJ to Calories
- Type a value in kilojoules.
- The result in calories appears instantly.
- Type in the second box to convert the other way.
How to convert kilojoules to calories
Multiply the value in kilojoules by 0.239006. Formula: kcal = kJ ÷ 4.184. Example: 10 kJ × 0.239006 = 2.3901 kcal.
Common kilojoules to calories conversions
5 kJ = 1.195 kcal. 25 kJ = 5.9751 kcal. 50 kJ = 11.9503 kcal. 100 kJ = 23.9006 kcal.
Quick mental math
Quick estimate: divide by 4.2. 2,000 kJ ≈ 476 Cal (exact: 478 Cal).
Where is kJ to kcal conversion used?
Energy conversions are used to read food labels (Calories vs kilojoules), track diet and exercise, compare electricity use in kWh, size heaters and air conditioners in BTU, and in physics and engineering.
What are kilojoules?
A kilojoule is 1,000 joules, the SI unit of energy. Food labels in Australia, New Zealand and the EU show energy in kJ.
What are calories?
A food Calorie (with a capital C) is one kilocalorie, exactly 4.184 kilojoules. It is the energy unit on food labels and fitness trackers in the US and UK.
Kilojoules to calories conversion table
| Kilojoules (kJ) | Calories (kcal) |
|---|---|
| 1 | 0.239006 |
| 10 | 2.3901 |
| 50 | 11.9503 |
| 100 | 23.9006 |
| 200 | 47.8011 |
| 250 | 59.7514 |
| 300 | 71.7017 |
| 500 | 119.5029 |
| 750 | 179.2543 |
| 1,000 | 239.0057 |
| 1,500 | 358.5086 |
| 2,000 | 478.0115 |
| 2,500 | 597.5143 |
| 5,000 | 1,195.03 |
Frequently asked questions
How many calories are in 1 kilojoule?
1 kilojoule = 0.239006 calories (1 kJ = 0.239006 kcal).
How many kilojoules are in 1 calorie?
1 calorie = 4.184 kilojoules (1 kcal = 4.184 kJ).
What is 10 kJ in calories?
10 kJ = 2.3901 kcal.
What is 100 kJ in calories?
100 kJ = 23.9006 kcal.
Is the kJ to kcal conversion exact?
Yes. A food Calorie (kilocalorie) is defined as exactly 4.184 kJ, 1 kWh is exactly 3,600 kJ, and the international BTU is 1,055.05585262 joules. Results are rounded only for display.
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