A kilojoule (kJ) equals 1,000 joules and is commonly used on nutrition labels outside the United States.
Kilojoules to Calories
Convert Kilojoule (kJ) to Calorie (cal) instantly with an exact formula, conversion table, and FAQ.
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Convert kilojoules (kJ) to calories (cal) instantly with formula, conversion table, and FAQ.
Context values
Some unit families need one extra value for a physically accurate result.
A (small) calorie is a thermochemical unit of heat energy equal to 4.184 joules, historically the energy needed to raise 1 gram of water by 1°C.
cal = kJ × 239.0057361
Results update instantly for Kilojoules to Calories conversions.
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Formula
cal = kJ × 239.0057361
kJ = cal × 0.004184
Conversion table
| 1 kJ | 239.005736 cal |
| 5 kJ | 1195.028681 cal |
| 10 kJ | 2390.057361 cal |
| 20 kJ | 4780.114723 cal |
| 50 kJ | 11950.286807 cal |
| 100 kJ | 23900.573614 cal |
| 500 kJ | 119502.868069 cal |
| 1000 kJ | 239005.736138 cal |
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How the formula works
Both kilojoule and calorie measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in kilojoules by 239.0057361 to get calories. To reverse the conversion, multiply a calorie value by 0.004184 to get back to kilojoules.
Frequently asked questions
What is Kilojoule (kJ)?
A kilojoule (kJ) equals 1,000 joules and is commonly used on nutrition labels outside the United States.
What is Calorie (cal)?
A (small) calorie is a thermochemical unit of heat energy equal to 4.184 joules, historically the energy needed to raise 1 gram of water by 1°C.
How do I convert kilojoules to calories?
Multiply the kilojoule value by 239.0057361 to get the equivalent in calories. For example, 5 kJ × 239.0057361 = 1195.028681 cal.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 239.0057361 is an exact, non-rounded value.
Can I convert calories back to kilojoules?
Yes. Divide the calorie value by 239.0057361, or multiply it by 0.004184, to get kilojoules.
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About converting kilojoules to calories
A kilojoule (kJ) equals 1,000 joules and is commonly used on nutrition labels outside the United States. A (small) calorie is a thermochemical unit of heat energy equal to 4.184 joules, historically the energy needed to raise 1 gram of water by 1°C.
Use this calculator to move between kilojoules and calories accurately for homework, engineering, billing, or everyday energy calculations. The Universal Converter uses exact unit factors, so results stay consistent across the site.