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 Electronvolts
Convert Calorie (cal) to Electronvolt (eV) instantly with an exact formula, conversion table, and FAQ.
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Convert calories (cal) to electronvolts (eV) instantly with formula, conversion table, and FAQ.
Context values
Some unit families need one extra value for a physically accurate result.
An electronvolt (eV) is the energy gained by a single electron accelerating through a potential difference of one volt, widely used in atomic and particle physics.
eV = cal × 2.611447397e+19
Results update instantly for Calories to Electronvolts conversions.
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Formula
eV = cal × 2.611447397e+19
cal = eV × 3.829294058e-20
Conversion table
| 1 cal | 2.611447e+19 eV |
| 5 cal | 1.305724e+20 eV |
| 10 cal | 2.611447e+20 eV |
| 20 cal | 5.222895e+20 eV |
| 50 cal | 1.305724e+21 eV |
| 100 cal | 2.611447e+21 eV |
| 500 cal | 1.305724e+22 eV |
| 1000 cal | 2.611447e+22 eV |
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How the formula works
Both calorie and electronvolt measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in calories by 2.611447397e+19 to get electronvolts. To reverse the conversion, multiply a electronvolt value by 3.829294058e-20 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 Electronvolt (eV)?
An electronvolt (eV) is the energy gained by a single electron accelerating through a potential difference of one volt, widely used in atomic and particle physics.
How do I convert calories to electronvolts?
Multiply the calorie value by 2.611447397e+19 to get the equivalent in electronvolts. For example, 5 cal × 2.611447397e+19 = 1.305724e+20 eV.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 2.611447397e+19 is an exact, non-rounded value.
Can I convert electronvolts back to calories?
Yes. Divide the electronvolt value by 2.611447397e+19, or multiply it by 3.829294058e-20, to get calories.
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About converting calories to electronvolts
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. An electronvolt (eV) is the energy gained by a single electron accelerating through a potential difference of one volt, widely used in atomic and particle physics.
Use this calculator to move between calories and electronvolts accurately for homework, engineering, billing, or everyday energy calculations. The Universal Converter uses exact unit factors, so results stay consistent across the site.