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 Calories
Convert Picojoule (pJ) to Calorie (cal) instantly with an exact formula, conversion table, and FAQ.
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Convert picojoules (pJ) to calories (cal) instantly with formula, conversion table, and FAQ.
Context values
Some unit families need one extra value for a physically accurate result.
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.
cal = pJ × 2.390057361e-13
Results update instantly for Picojoules to Calories conversions.
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Formula
cal = pJ × 2.390057361e-13
pJ = cal × 4184000000000
Conversion table
| 1 pJ | 2.390057e-13 cal |
| 5 pJ | 1.195029e-12 cal |
| 10 pJ | 2.390057e-12 cal |
| 20 pJ | 4.780115e-12 cal |
| 50 pJ | 1.195029e-11 cal |
| 100 pJ | 2.390057e-11 cal |
| 500 pJ | 1.195029e-10 cal |
| 1000 pJ | 2.390057e-10 cal |
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How the formula works
Both picojoule and calorie measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in picojoules by 2.390057361e-13 to get calories. To reverse the conversion, multiply a calorie value by 4184000000000 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 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.
How do I convert picojoules to calories?
Multiply the picojoule value by 2.390057361e-13 to get the equivalent in calories. For example, 5 pJ × 2.390057361e-13 = 1.195029e-12 cal.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 2.390057361e-13 is an exact, non-rounded value.
Can I convert calories back to picojoules?
Yes. Divide the calorie value by 2.390057361e-13, or multiply it by 4184000000000, to get picojoules.
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About converting picojoules to calories
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 (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.
Use this calculator to move between picojoules and calories accurately for homework, engineering, billing, or everyday energy calculations. The Universal Converter uses exact unit factors, so results stay consistent across the site.