Joules to Calories Converter
Convert joules to calories easily. Free joule to calorie converter for energy calculations.
Formula
cal = J × 0.239006
Common Conversions
How to Convert Joules to Calories
1 joule = 0.239 calories. Divide joules by 4.184 to get calories. So 1000 J ÷ 4.184 = 239 cal. This conversion uses the 'small calorie' (cal); for food calories (kcal), divide by 4,184. So 8,368 kJ = 2,000 kcal (a typical daily food intake).
Most useful for translating European nutrition labels (which often lead with kJ) to American kcal-based calorie counts. A 500 kJ snack = 119 kcal. A 2,000 kJ meal = 478 kcal. 'Daily energy intake' targets vary by country: US ~2,000 kcal = 8,368 kJ; AU/NZ ~8,700 kJ = 2,080 kcal.
Common Joules to Calories
| Joules (J) | Calories (cal) | Kcal (food) |
|---|---|---|
| 100 J | 23.9 cal | 0.024 kcal |
| 1000 J (1 kJ) | 239 cal | 0.239 kcal |
| 10000 J | 2390 cal | 2.39 kcal |
| 100000 J (100 kJ) | 23,900 cal | 23.9 kcal |
| 500 kJ | 119,500 cal | 119.5 kcal |
| 1000 kJ (1 MJ) | 239,000 cal | 239 kcal |
| 8400 kJ | 2,008,000 cal | 2008 kcal |
| 10000 kJ | 2,390,000 cal | 2390 kcal |
Frequently Asked Questions
Why does my Australian food label show kJ?
Australian nutrition labelling regulation defaults to kJ. UK shows both kJ and kcal. US shows only kcal (labelled as 'calories'). A 2000 kcal daily diet = 8,400 kJ approximately. Use 4.184 as the conversion factor.
How precise is the 4.184 factor?
More precisely 4.18400 J per cal (exact, by definition since 1956). Some older sources use 4.1868 (different historical definition). Modern usage standardises on 4.184. Within nutrition/cooking contexts, the 0.04% difference is irrelevant.
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