Joules to Electronvolts Converter

To convert a measurement in joules to electronvolts, multiply the value by 6.241509e+18. The conversion factor comes from the relationship between both units and the joule.

For example, to convert 5 J to electronvolts: 5 × 6.241509e+18 = 3.120755e+19 eV.

A joule is the SI derived unit of energy, equal to the work done when a force of one newton moves an object one meter (1 N·m). Named after the English physicist James Prescott Joule, who established the mechanical equivalent of heat in the 1840s. The joule became the SI standard for all forms of energy, work, and heat.

Common uses of joules include: Scientific and engineering energy calculations; Nutrition labeling in metric countries; Mechanical work and kinetic energy; Electrical energy in physics (watt-seconds).

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 J = 6.241509e+18 eV 5 J = 3.120755e+19 eV 10 J = 6.241509e+19 eV 50 J = 3.120755e+20 eV 100 J = 6.241509e+20 eV