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.
Calories to Picojoules
Convert Calorie (cal) to Picojoule (pJ) instantly with an exact formula, conversion table, and FAQ.
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Convert calories (cal) to picojoules (pJ) instantly with formula, conversion table, and FAQ.
Context values
Some unit families need one extra value for a physically accurate result.
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.
pJ = cal × 4184000000000
Results update instantly for Calories to Picojoules conversions.
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Formula
pJ = cal × 4184000000000
cal = pJ × 2.390057361e-13
Conversion table
| 1 cal | 4.184000e+12 pJ |
| 5 cal | 2.092000e+13 pJ |
| 10 cal | 4.184000e+13 pJ |
| 20 cal | 8.368000e+13 pJ |
| 50 cal | 2.092000e+14 pJ |
| 100 cal | 4.184000e+14 pJ |
| 500 cal | 2.092000e+15 pJ |
| 1000 cal | 4.184000e+15 pJ |
Related conversions
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How the formula works
Both calorie and picojoule measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in calories by 4184000000000 to get picojoules. To reverse the conversion, multiply a picojoule value by 2.390057361e-13 to get back to calories.
Frequently asked questions
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.
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.
How do I convert calories to picojoules?
Multiply the calorie value by 4184000000000 to get the equivalent in picojoules. For example, 5 cal × 4184000000000 = 2.092000e+13 pJ.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 4184000000000 is an exact, non-rounded value.
Can I convert picojoules back to calories?
Yes. Divide the picojoule value by 4184000000000, or multiply it by 2.390057361e-13, to get calories.
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About converting calories to picojoules
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. 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.
Use this calculator to move between calories and picojoules accurately for homework, engineering, billing, or everyday energy calculations. The Universal Converter uses exact unit factors, so results stay consistent across the site.