A kilocalorie (kcal) equals 1,000 small calories and is the unit behind the food "Calorie" shown on nutrition labels.
Kilocalories to Exajoules
Convert Kilocalorie (kcal) to Exajoule (EJ) instantly with an exact formula, conversion table, and FAQ.
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Convert kilocalories (kcal) to exajoules (EJ) instantly with formula, conversion table, and FAQ.
Context values
Some unit families need one extra value for a physically accurate result.
A exajoule (EJ) is a metric-prefixed unit of energy equal to 1018 joules, using the SI exa prefix.
EJ = kcal × 4.184000000e-15
Results update instantly for Kilocalories to Exajoules conversions.
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Formula
EJ = kcal × 4.184000000e-15
kcal = EJ × 239005736137667
Conversion table
| 1 kcal | 4.184000e-15 EJ |
| 5 kcal | 2.092000e-14 EJ |
| 10 kcal | 4.184000e-14 EJ |
| 20 kcal | 8.368000e-14 EJ |
| 50 kcal | 2.092000e-13 EJ |
| 100 kcal | 4.184000e-13 EJ |
| 500 kcal | 2.092000e-12 EJ |
| 1000 kcal | 4.184000e-12 EJ |
Related conversions
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How the formula works
Both kilocalorie and exajoule measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in kilocalories by 4.184000000e-15 to get exajoules. To reverse the conversion, multiply a exajoule value by 239005736137667 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 Exajoule (EJ)?
A exajoule (EJ) is a metric-prefixed unit of energy equal to 1018 joules, using the SI exa prefix.
How do I convert kilocalories to exajoules?
Multiply the kilocalorie value by 4.184000000e-15 to get the equivalent in exajoules. For example, 5 kcal × 4.184000000e-15 = 2.092000e-14 EJ.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 4.184000000e-15 is an exact, non-rounded value.
Can I convert exajoules back to kilocalories?
Yes. Divide the exajoule value by 4.184000000e-15, or multiply it by 239005736137667, to get kilocalories.
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About converting kilocalories to exajoules
A kilocalorie (kcal) equals 1,000 small calories and is the unit behind the food "Calorie" shown on nutrition labels. A exajoule (EJ) is a metric-prefixed unit of energy equal to 1018 joules, using the SI exa prefix.
Use this calculator to move between kilocalories and exajoules accurately for homework, engineering, billing, or everyday energy calculations. The Universal Converter uses exact unit factors, so results stay consistent across the site.