A yoctojoule (yJ) is a metric-prefixed unit of energy equal to 10-24 joules, a fraction of a single joule, using the SI yocto prefix.
Yoctojoules to Calories
Convert Yoctojoule (yJ) to Calorie (cal) instantly with an exact formula, conversion table, and FAQ.
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Convert yoctojoules (yJ) 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 = yJ × 2.390057361e-25
Results update instantly for Yoctojoules to Calories conversions.
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Formula
cal = yJ × 2.390057361e-25
yJ = cal × 4.184000000e+24
Conversion table
| 1 yJ | 2.390057e-25 cal |
| 5 yJ | 1.195029e-24 cal |
| 10 yJ | 2.390057e-24 cal |
| 20 yJ | 4.780115e-24 cal |
| 50 yJ | 1.195029e-23 cal |
| 100 yJ | 2.390057e-23 cal |
| 500 yJ | 1.195029e-22 cal |
| 1000 yJ | 2.390057e-22 cal |
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How the formula works
Both yoctojoule and calorie measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in yoctojoules by 2.390057361e-25 to get calories. To reverse the conversion, multiply a calorie value by 4.184000000e+24 to get back to yoctojoules.
Frequently asked questions
What is Yoctojoule (yJ)?
A yoctojoule (yJ) is a metric-prefixed unit of energy equal to 10-24 joules, a fraction of a single joule, using the SI yocto 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 yoctojoules to calories?
Multiply the yoctojoule value by 2.390057361e-25 to get the equivalent in calories. For example, 5 yJ × 2.390057361e-25 = 1.195029e-24 cal.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 2.390057361e-25 is an exact, non-rounded value.
Can I convert calories back to yoctojoules?
Yes. Divide the calorie value by 2.390057361e-25, or multiply it by 4.184000000e+24, to get yoctojoules.
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About converting yoctojoules to calories
A yoctojoule (yJ) is a metric-prefixed unit of energy equal to 10-24 joules, a fraction of a single joule, using the SI yocto 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 yoctojoules 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.