A picojoule (pJ) is a metric-prefixed unit of energy equal to 10-12 joules, a fraction of a single joule, using the SI pico prefix.
Picojoules to Kilocalories
Convert Picojoule (pJ) to Kilocalorie (kcal) instantly with an exact formula, conversion table, and FAQ.
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Convert picojoules (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 × 2.390057361e-16
Results update instantly for Picojoules to Kilocalories conversions.
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Formula
kcal = pJ × 2.390057361e-16
pJ = kcal × 4.184000000e+15
Conversion table
| 1 pJ | 2.390057e-16 kcal |
| 5 pJ | 1.195029e-15 kcal |
| 10 pJ | 2.390057e-15 kcal |
| 20 pJ | 4.780115e-15 kcal |
| 50 pJ | 1.195029e-14 kcal |
| 100 pJ | 2.390057e-14 kcal |
| 500 pJ | 1.195029e-13 kcal |
| 1000 pJ | 2.390057e-13 kcal |
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How the formula works
Both picojoule and kilocalorie measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in picojoules by 2.390057361e-16 to get kilocalories. To reverse the conversion, multiply a kilocalorie value by 4.184000000e+15 to get back to picojoules.
Frequently asked questions
What is Picojoule (pJ)?
A picojoule (pJ) is a metric-prefixed unit of energy equal to 10-12 joules, a fraction of a single joule, using the SI pico 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 picojoules to kilocalories?
Multiply the picojoule value by 2.390057361e-16 to get the equivalent in kilocalories. For example, 5 pJ × 2.390057361e-16 = 1.195029e-15 kcal.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 2.390057361e-16 is an exact, non-rounded value.
Can I convert kilocalories back to picojoules?
Yes. Divide the kilocalorie value by 2.390057361e-16, or multiply it by 4.184000000e+15, to get picojoules.
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About converting picojoules to kilocalories
A picojoule (pJ) is a metric-prefixed unit of energy equal to 10-12 joules, a fraction of a single joule, using the SI pico 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 picojoules 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.