Electronvolts to Calories Converter

To convert a measurement in electronvolts to calories, multiply the value by 3.829294e-20. The conversion factor comes from the relationship between both units and the joule.

For example, to convert 5 eV to calories: 5 × 3.829294e-20 = 1.914647e-19 cal.

An electronvolt is the energy gained by one electron moving through a potential difference of one volt, equal to about 1.602 × 10⁻¹⁹ joules. The electronvolt became essential in atomic and particle physics, where joules are impractically large. Particle accelerator energies are expressed in mega-, giga-, and tera-electronvolts.

Common uses of electronvolts include: Atomic and particle physics; Semiconductor band-gap energies; Photon and X-ray energy; Chemistry ionization energies.

A calorie (small calorie) is the energy needed to raise the temperature of one gram of water by one degree Celsius, defined as exactly 4.184 joules. The calorie originated in early-19th-century thermodynamics. The thermochemical calorie, fixed at exactly 4.184 J, is the modern standard, though it is often confused with the larger food Calorie (kilocalorie).

Common uses of calories include: Chemistry and thermodynamics; Heat-of-reaction measurements; Physics heat-transfer problems; Historical energy references.

Here are some common values converted:

1 eV = 3.829294e-20 cal 5 eV = 1.914647e-19 cal 10 eV = 3.829294e-19 cal 50 eV = 1.914647e-18 cal 100 eV = 3.829294e-18 cal