kJ to Calories Converter
Type a value in kilojoules to see it in calories as you type, with the exact formula and a reference chart.
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How this was calculated
- 1 calorie = 4.184 kilojoules
- 2,000 ÷ 4.184 = 478.01147 Cal
| kJ | Cal |
|---|---|
| 100 kJ | 23.9006 Cal |
| 200 kJ | 47.8011 Cal |
| 250 kJ | 59.7514 Cal |
| 300 kJ | 71.7017 Cal |
| 400 kJ | 95.6023 Cal |
| 500 kJ | 119.503 Cal |
| 600 kJ | 143.403 Cal |
| 700 kJ | 167.304 Cal |
| 800 kJ | 191.205 Cal |
| 850 kJ | 203.155 Cal |
| 900 kJ | 215.105 Cal |
| 1,000 kJ | 239.006 Cal |
| 1,200 kJ | 286.807 Cal |
| 1,500 kJ | 358.509 Cal |
| 1,800 kJ | 430.21 Cal |
| 2,000 kJ | 478.011 Cal |
| 2,500 kJ | 597.514 Cal |
| 3,000 kJ | 717.017 Cal |
| 3,500 kJ | 836.52 Cal |
| 4,000 kJ | 956.023 Cal |
| 5,000 kJ | 1,195.03 Cal |
| 8,000 kJ | 1,912.05 Cal |
| 8,700 kJ | 2,079.35 Cal |
| 10,000 kJ | 2,390.06 Cal |
| Cal | kJ |
|---|---|
| 20 Cal | 83.68 kJ |
| 50 Cal | 209.2 kJ |
| 100 Cal | 418.4 kJ |
| 200 Cal | 836.8 kJ |
| 500 Cal | 2,092 kJ |
| 1,000 Cal | 4,184 kJ |
| 2,000 Cal | 8,368 kJ |
How to convert kilojoules to calories
1 kilojoule = 0.2390057361 calories. To convert kilojoules to calories, divide by 4.184 (or multiply by 0.2390057361). A kilojoule is 1,000 joules; food labels in Australia, New Zealand and the EU list energy in kJ. A food calorie (Calorie, written with a capital C on labels) is one kilocalorie, exactly 4,184 J.
Worked examples
- 500 kilojoules = 119.503 Cal (500 ÷ 4.184)
- 2,000 kilojoules = 478.011 Cal (2,000 ÷ 4.184)
- 8,700 kilojoules = 2,079.35 Cal (8,700 ÷ 4.184)
Where this conversion comes up
Kilojoules are used for food labels outside the US and exercise machines; calories for US nutrition labels, calorie counting and fitness apps. Food labels in Australia, New Zealand and the EU list kilojoules; one food Calorie (kcal) is 4.184 kJ. The 8,700 kJ adult daily guide is 2,079 Calories, and a 500 kJ snack is about 120 Calories.
Quick estimate
Divide by 4.2 (0.4% low), or by 4 and subtract 4%.
Common mistakes
- Multiplying instead of dividing. A calorie is larger than a kilojoule, so the number of calories must come out smaller: 500 kilojoules = 119.503 Cal.
- Rounding too early. Keep the full factor until the last step; rounding 0.239 to 0.24 first puts large values noticeably off.
Related energy converters: kcal to kj, kj to kcal.
Frequently asked questions
How do you convert kilojoules to calories?
Multiply the kilojoules by 0.2390057361 (or divide by 4.184). For example, 2,000 kilojoules is 478.011 calories.
How many calories are in one kilojoule?
One kilojoule is 0.2390057361 calories. A kilojoule is 1,000 joules; food labels in Australia, New Zealand and the EU list energy in kJ.
What is 8,700 kilojoules in calories?
8,700 kilojoules is 2,079.35 calories.
Is there a quick way to estimate kilojoules to calories?
Divide by 4.2 (0.4% low), or by 4 and subtract 4%.