Unit Converter
Kilojoules to Kilocalories Converter
Convert kilojoules to kilocalories instantly. 1 kJ = 0.239006 kcal. Free online calculator with exact formulas and conversion tables.
Kilocalories
0.239006 kcal
1 kJ = 0.239006 kcal
Kilojoules to Kilocalories formula
kcal = kJ × 0.239006Kilojoules and kilocalories both measure energy, but use different scales. The kilocalorie (food Calorie) is larger—one kcal equals about 4.184 kJ. The conversion factor 0.239006 reflects this ratio, derived from the physical relationship between joules and calories as units of thermodynamic energy.
Kilojoules to Kilocalories conversion table
| Kilojoules (kJ) | Kilocalories (kcal) |
|---|---|
| 1 kJ | 0.239006 kcal |
| 2 kJ | 0.478011 kcal |
| 5 kJ | 1.195 kcal |
| 10 kJ | 2.3901 kcal |
| 20 kJ | 4.7801 kcal |
| 50 kJ | 11.9503 kcal |
| 100 kJ | 23.9006 kcal |
| 200 kJ | 47.8011 kcal |
| 500 kJ | 119.5 kcal |
| 1000 kJ | 239.01 kcal |
When you need to convert kilojoules to kilocalories
- Reading nutrition labels: converting food energy from kilojoules (common in Europe, Australia) to kilocalories (US labeling).
- Fitness and exercise: understanding workout intensity and calorie expenditure when data comes from different regional sources.
- Scientific research: converting energy measurements between journal articles and datasets using different unit systems.
- Cooking and recipe scaling: adjusting recipe energy content when sourcing ingredients or instructions internationally.
- Dietary planning: comparing nutritional databases that report energy in different units across countries.
Frequently asked questions
Why is a kilocalorie larger than a kilojoule?
A kilocalorie is about 4.184 times larger. Joules are the SI standard energy unit, while calories are older historical units. One food Calorie actually equals 1,000 small calories, which equals roughly 4.184 kilojoules.
Which unit appears on nutrition labels?
The US uses kilocalories (kcal or Cal). Most other countries now use kilojoules, though some list both. Check your local regulations and product origin to know which unit applies.
Is this the same as the calories burned in fitness?
Yes. When fitness trackers or gyms say you burned calories, they mean kilocalories. One kcal is the energy needed to raise 1 kg of water by 1°C, the standard food and exercise energy unit.