Calories to Electronvolts Converter

To convert a measurement in calories to electronvolts, multiply the value by 2.611447e+19. The conversion factor comes from the relationship between both units and the joule.

For example, to convert 5 cal to electronvolts: 5 × 2.611447e+19 = 1.305724e+20 eV.

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.

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.

Here are some common values converted:

1 cal = 2.611447e+19 eV 5 cal = 1.305724e+20 eV 10 cal = 2.611447e+20 eV 50 cal = 1.305724e+21 eV 100 cal = 2.611447e+21 eV