A kilocalorie (kcal) equals 1,000 small calories and is the unit behind the food "Calorie" shown on nutrition labels.
Kilocalories to Centijoules
Convert Kilocalorie (kcal) to Centijoule (cJ) instantly with an exact formula, conversion table, and FAQ.
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Convert kilocalories (kcal) to centijoules (cJ) instantly with formula, conversion table, and FAQ.
Context values
Some unit families need one extra value for a physically accurate result.
A centijoule (cJ) is a metric-prefixed unit of energy equal to 10-2 joules, a fraction of a single joule, using the SI centi prefix.
cJ = kcal × 418400
Results update instantly for Kilocalories to Centijoules conversions.
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Formula
cJ = kcal × 418400
kcal = cJ × 0.000002390057361
Conversion table
| 1 kcal | 418400 cJ |
| 5 kcal | 2.092000e+06 cJ |
| 10 kcal | 4.184000e+06 cJ |
| 20 kcal | 8.368000e+06 cJ |
| 50 kcal | 2.092000e+07 cJ |
| 100 kcal | 4.184000e+07 cJ |
| 500 kcal | 2.092000e+08 cJ |
| 1000 kcal | 4.184000e+08 cJ |
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How the formula works
Both kilocalorie and centijoule measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in kilocalories by 418400 to get centijoules. To reverse the conversion, multiply a centijoule value by 0.000002390057361 to get back to kilocalories.
Frequently asked questions
What is Kilocalorie (kcal)?
A kilocalorie (kcal) equals 1,000 small calories and is the unit behind the food "Calorie" shown on nutrition labels.
What is Centijoule (cJ)?
A centijoule (cJ) is a metric-prefixed unit of energy equal to 10-2 joules, a fraction of a single joule, using the SI centi prefix.
How do I convert kilocalories to centijoules?
Multiply the kilocalorie value by 418400 to get the equivalent in centijoules. For example, 5 kcal × 418400 = 2.092000e+06 cJ.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 418400 is an exact, non-rounded value.
Can I convert centijoules back to kilocalories?
Yes. Divide the centijoule value by 418400, or multiply it by 0.000002390057361, to get kilocalories.
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About converting kilocalories to centijoules
A kilocalorie (kcal) equals 1,000 small calories and is the unit behind the food "Calorie" shown on nutrition labels. A centijoule (cJ) is a metric-prefixed unit of energy equal to 10-2 joules, a fraction of a single joule, using the SI centi prefix.
Use this calculator to move between kilocalories and centijoules accurately for homework, engineering, billing, or everyday energy calculations. The Universal Converter uses exact unit factors, so results stay consistent across the site.