A petajoule (PJ) is a metric-prefixed unit of energy equal to 1015 joules, using the SI peta prefix.
Petajoules to Kilocalories
Convert Petajoule (PJ) to Kilocalorie (kcal) instantly with an exact formula, conversion table, and FAQ.
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Convert petajoules (PJ) to kilocalories (kcal) instantly with formula, conversion table, and FAQ.
Context values
Some unit families need one extra value for a physically accurate result.
A kilocalorie (kcal) equals 1,000 small calories and is the unit behind the food "Calorie" shown on nutrition labels.
kcal = PJ × 239005736138
Results update instantly for Petajoules to Kilocalories conversions.
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Formula
kcal = PJ × 239005736138
PJ = kcal × 4.184000000e-12
Conversion table
| 1 PJ | 2.390057e+11 kcal |
| 5 PJ | 1.195029e+12 kcal |
| 10 PJ | 2.390057e+12 kcal |
| 20 PJ | 4.780115e+12 kcal |
| 50 PJ | 1.195029e+13 kcal |
| 100 PJ | 2.390057e+13 kcal |
| 500 PJ | 1.195029e+14 kcal |
| 1000 PJ | 2.390057e+14 kcal |
Related conversions
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How the formula works
Both petajoule and kilocalorie measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in petajoules by 239005736138 to get kilocalories. To reverse the conversion, multiply a kilocalorie value by 4.184000000e-12 to get back to petajoules.
Frequently asked questions
What is Petajoule (PJ)?
A petajoule (PJ) is a metric-prefixed unit of energy equal to 1015 joules, using the SI peta prefix.
What is Kilocalorie (kcal)?
A kilocalorie (kcal) equals 1,000 small calories and is the unit behind the food "Calorie" shown on nutrition labels.
How do I convert petajoules to kilocalories?
Multiply the petajoule value by 239005736138 to get the equivalent in kilocalories. For example, 5 PJ × 239005736138 = 1.195029e+12 kcal.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 239005736138 is an exact, non-rounded value.
Can I convert kilocalories back to petajoules?
Yes. Divide the kilocalorie value by 239005736138, or multiply it by 4.184000000e-12, to get petajoules.
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About converting petajoules to kilocalories
A petajoule (PJ) is a metric-prefixed unit of energy equal to 1015 joules, using the SI peta prefix. A kilocalorie (kcal) equals 1,000 small calories and is the unit behind the food "Calorie" shown on nutrition labels.
Use this calculator to move between petajoules and kilocalories accurately for homework, engineering, billing, or everyday energy calculations. The Universal Converter uses exact unit factors, so results stay consistent across the site.