A kilocalorie (kcal) equals 1,000 small calories and is the unit behind the food "Calorie" shown on nutrition labels.
Kilocalories to Terajoules
Convert Kilocalorie (kcal) to Terajoule (TJ) instantly with an exact formula, conversion table, and FAQ.
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Convert kilocalories (kcal) to terajoules (TJ) instantly with formula, conversion table, and FAQ.
Context values
Some unit families need one extra value for a physically accurate result.
A terajoule (TJ) is a metric-prefixed unit of energy equal to 1012 joules, using the SI tera prefix.
TJ = kcal × 4.184000000e-09
Results update instantly for Kilocalories to Terajoules conversions.
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Formula
TJ = kcal × 4.184000000e-09
kcal = TJ × 239005736.1
Conversion table
| 1 kcal | 4.184000e-09 TJ |
| 5 kcal | 2.092000e-08 TJ |
| 10 kcal | 4.184000e-08 TJ |
| 20 kcal | 8.368000e-08 TJ |
| 50 kcal | 2.092000e-07 TJ |
| 100 kcal | 4.184000e-07 TJ |
| 500 kcal | 0.000002 TJ |
| 1000 kcal | 0.000004 TJ |
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How the formula works
Both kilocalorie and terajoule measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in kilocalories by 4.184000000e-09 to get terajoules. To reverse the conversion, multiply a terajoule value by 239005736.1 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 Terajoule (TJ)?
A terajoule (TJ) is a metric-prefixed unit of energy equal to 1012 joules, using the SI tera prefix.
How do I convert kilocalories to terajoules?
Multiply the kilocalorie value by 4.184000000e-09 to get the equivalent in terajoules. For example, 5 kcal × 4.184000000e-09 = 2.092000e-08 TJ.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 4.184000000e-09 is an exact, non-rounded value.
Can I convert terajoules back to kilocalories?
Yes. Divide the terajoule value by 4.184000000e-09, or multiply it by 239005736.1, to get kilocalories.
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About converting kilocalories to terajoules
A kilocalorie (kcal) equals 1,000 small calories and is the unit behind the food "Calorie" shown on nutrition labels. A terajoule (TJ) is a metric-prefixed unit of energy equal to 1012 joules, using the SI tera prefix.
Use this calculator to move between kilocalories and terajoules accurately for homework, engineering, billing, or everyday energy calculations. The Universal Converter uses exact unit factors, so results stay consistent across the site.