Kilojoules to Electronvolts Converter

To convert a measurement in kilojoules to electronvolts, multiply the value by 6.241509e+21. The conversion factor comes from the relationship between both units and the joule.

For example, to convert 5 kJ to electronvolts: 5 × 6.241509e+21 = 3.120755e+22 eV.

A kilojoule equals 1,000 joules and is the standard metric unit for expressing food energy on nutrition labels in most of the world. As metric countries adopted SI units for food labeling, the kilojoule replaced the food calorie on packaging in regions such as Australia, New Zealand, and the European Union (shown alongside kcal).

Common uses of kilojoules include: Food energy on nutrition labels; Dietary and exercise energy tracking; Chemical reaction energy (enthalpy); Battery and mechanical energy specs.

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 kJ = 6.241509e+21 eV 5 kJ = 3.120755e+22 eV 10 kJ = 6.241509e+22 eV 50 kJ = 3.120755e+23 eV 100 kJ = 6.241509e+23 eV