The joule (J) is the SI derived unit of energy, equal to the work done when a force of one newton acts over one meter.
Joules to Kilocalories
Convert Joule (J) to Kilocalorie (kcal) instantly with an exact formula, conversion table, and FAQ.
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Convert joules (J) to kilocalories (kcal) instantly with formula, conversion table, and FAQ.
Context values
Some unit families need one extra value for a physically accurate result.
A kilocalorie (kcal) equals 1,000 small calories and is the unit behind the food "Calorie" shown on nutrition labels.
kcal = J × 0.0002390057361
Results update instantly for Joules to Kilocalories conversions.
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Formula
kcal = J × 0.0002390057361
J = kcal × 4184
Conversion table
| 1 J | 0.000239 kcal |
| 5 J | 0.001195 kcal |
| 10 J | 0.002390 kcal |
| 20 J | 0.004780 kcal |
| 50 J | 0.011950 kcal |
| 100 J | 0.023901 kcal |
| 500 J | 0.119503 kcal |
| 1000 J | 0.239006 kcal |
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How the formula works
Both joule and kilocalorie measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in joules by 0.0002390057361 to get kilocalories. To reverse the conversion, multiply a kilocalorie value by 4184 to get back to joules.
Frequently asked questions
What is Joule (J)?
The joule (J) is the SI derived unit of energy, equal to the work done when a force of one newton acts over one meter.
What is Kilocalorie (kcal)?
A kilocalorie (kcal) equals 1,000 small calories and is the unit behind the food "Calorie" shown on nutrition labels.
How do I convert joules to kilocalories?
Multiply the joule value by 0.0002390057361 to get the equivalent in kilocalories. For example, 5 J × 0.0002390057361 = 0.001195 kcal.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 0.0002390057361 is an exact, non-rounded value.
Can I convert kilocalories back to joules?
Yes. Divide the kilocalorie value by 0.0002390057361, or multiply it by 4184, to get joules.
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About converting joules to kilocalories
The joule (J) is the SI derived unit of energy, equal to the work done when a force of one newton acts over one meter. A kilocalorie (kcal) equals 1,000 small calories and is the unit behind the food "Calorie" shown on nutrition labels.
Use this calculator to move between joules and kilocalories accurately for homework, engineering, billing, or everyday energy calculations. The Universal Converter uses exact unit factors, so results stay consistent across the site.