Convert Kilojoules to Calories
kJ to cal · energy conversion
What are kilojoules and calories?
A kilojoule is 1,000 joules, used for food energy outside the US. A small calorie is the energy to heat one gram of water by 1 °C, about 4.184 J. For reference: a food Calorie is one kilocalorie (4,184 J), and home electricity is billed in kilowatt-hours.
How to convert kilojoules to calories
1 kJ = 239.006 cal. To convert, multiply the number of kilojoules by 239.006. For example, 5 kJ = 1,195.03 cal, and 20 kJ = 4,780.11 cal. To go the other way, multiply calories by 0.004184 (since 1 cal = 0.004184 kJ).
Kilojoules to Calories conversion table
| Kilojoules (kJ) | Calories (cal) |
|---|---|
| 1 | 239.006 |
| 10 | 2,390.06 |
| 100 | 23,900.6 |
| 500 | 119,503 |
| 1,000 | 239,006 |
| 2,000 | 478,011 |
| 5,000 | 1,195,030 |
FAQ
What is 1 kJ in cal?
1 kJ = 239.006 cal. To convert any amount, multiply the number of kilojoules by 239.006.
How do I convert calories back to kilojoules?
Go the other way: 1 cal = 0.004184 kJ, so multiply calories by 0.004184 to get kilojoules.
Is a kilojoule bigger than a calorie?
Yes — 1 kJ is the larger unit, equal to 239.006 cal.
Are these energy conversions exact?
They use the standard internationally-defined conversion factors. Results are rounded to six significant figures for readability, which is accurate enough for everyday and most technical use.