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.
Calories to Centijoules
Convert Calorie (cal) to Centijoule (cJ) instantly with an exact formula, conversion table, and FAQ.
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Convert calories (cal) 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 = cal × 418.4
Results update instantly for Calories to Centijoules conversions.
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Formula
cJ = cal × 418.4
cal = cJ × 0.002390057361
Conversion table
| 1 cal | 418.400000 cJ |
| 5 cal | 2092 cJ |
| 10 cal | 4184 cJ |
| 20 cal | 8368 cJ |
| 50 cal | 20920 cJ |
| 100 cal | 41840 cJ |
| 500 cal | 209200 cJ |
| 1000 cal | 418400 cJ |
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How the formula works
Both calorie and centijoule measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in calories by 418.4 to get centijoules. To reverse the conversion, multiply a centijoule value by 0.002390057361 to get back to calories.
Frequently asked questions
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.
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 calories to centijoules?
Multiply the calorie value by 418.4 to get the equivalent in centijoules. For example, 5 cal × 418.4 = 2092 cJ.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 418.4 is an exact, non-rounded value.
Can I convert centijoules back to calories?
Yes. Divide the centijoule value by 418.4, or multiply it by 0.002390057361, to get calories.
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About converting calories to centijoules
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. 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 calories 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.