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.
Electronvolts to Kilocalories
Convert Electronvolt (eV) to Kilocalorie (kcal) instantly with an exact formula, conversion table, and FAQ.
Reserved for a responsive leaderboard above the conversion details.
Professional calculator style
World-scale conversion engine
30+ categories
6,500+ units
Instant results
Offline ready
Energy calculator
Energy Converter
Convert electronvolts (eV) 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 = eV × 3.829294058e-23
Results update instantly for Electronvolts to Kilocalories conversions.
Reserved above the conversion cards and below the converter.
Formula
kcal = eV × 3.829294058e-23
eV = kcal × 2.611447397e+22
Conversion table
| 1 eV | 3.829294e-23 kcal |
| 5 eV | 1.914647e-22 kcal |
| 10 eV | 3.829294e-22 kcal |
| 20 eV | 7.658588e-22 kcal |
| 50 eV | 1.914647e-21 kcal |
| 100 eV | 3.829294e-21 kcal |
| 500 eV | 1.914647e-20 kcal |
| 1000 eV | 3.829294e-20 kcal |
Related conversions
Reserved between the cards and the FAQ so the page stays balanced.
How the formula works
Both electronvolt and kilocalorie measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in electronvolts by 3.829294058e-23 to get kilocalories. To reverse the conversion, multiply a kilocalorie value by 2.611447397e+22 to get back to electronvolts.
Frequently asked questions
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.
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 electronvolts to kilocalories?
Multiply the electronvolt value by 3.829294058e-23 to get the equivalent in kilocalories. For example, 5 eV × 3.829294058e-23 = 1.914647e-22 kcal.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 3.829294058e-23 is an exact, non-rounded value.
Can I convert kilocalories back to electronvolts?
Yes. Divide the kilocalorie value by 3.829294058e-23, or multiply it by 2.611447397e+22, to get electronvolts.
Reserved between the FAQ and the article so the page stays balanced.
About converting electronvolts to kilocalories
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. 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 electronvolts 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.