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 Decijoules
Convert Calorie (cal) to Decijoule (dJ) instantly with an exact formula, conversion table, and FAQ.
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Convert calories (cal) to decijoules (dJ) instantly with formula, conversion table, and FAQ.
Context values
Some unit families need one extra value for a physically accurate result.
A decijoule (dJ) is a metric-prefixed unit of energy equal to 10-1 joules, a fraction of a single joule, using the SI deci prefix.
dJ = cal × 41.84
Results update instantly for Calories to Decijoules conversions.
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Formula
dJ = cal × 41.84
cal = dJ × 0.02390057361
Conversion table
| 1 cal | 41.840000 dJ |
| 5 cal | 209.200000 dJ |
| 10 cal | 418.400000 dJ |
| 20 cal | 836.800000 dJ |
| 50 cal | 2092 dJ |
| 100 cal | 4184 dJ |
| 500 cal | 20920 dJ |
| 1000 cal | 41840 dJ |
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How the formula works
Both calorie and decijoule measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in calories by 41.84 to get decijoules. To reverse the conversion, multiply a decijoule value by 0.02390057361 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 Decijoule (dJ)?
A decijoule (dJ) is a metric-prefixed unit of energy equal to 10-1 joules, a fraction of a single joule, using the SI deci prefix.
How do I convert calories to decijoules?
Multiply the calorie value by 41.84 to get the equivalent in decijoules. For example, 5 cal × 41.84 = 209.200000 dJ.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 41.84 is an exact, non-rounded value.
Can I convert decijoules back to calories?
Yes. Divide the decijoule value by 41.84, or multiply it by 0.02390057361, to get calories.
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About converting calories to decijoules
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 decijoule (dJ) is a metric-prefixed unit of energy equal to 10-1 joules, a fraction of a single joule, using the SI deci prefix.
Use this calculator to move between calories and decijoules accurately for homework, engineering, billing, or everyday energy calculations. The Universal Converter uses exact unit factors, so results stay consistent across the site.