Convert Electronvolts to Kilojoules
Convert Electronvolts (eV) to Kilojoules (kJ) instantly and accurately.
Conversion Formula
kJ = eV × 1.602176634e-22
About Electronvolts
An electronvolt (eV) is the kinetic energy gained by one electron accelerated through 1 volt - exactly 1.602176634 × 10⁻¹⁹ J (fixed by the 2019 SI revision). It is the natural energy unit of atomic and particle physics: visible light photons carry 1.7-3.1 eV; hydrogen ionisation requires 13.6 eV; X-ray photons span 100 eV-100 keV; protons at the LHC reach 6.5 TeV. Rest masses use eV/c²: electron 0.511 MeV, proton 938.3 MeV, Higgs boson 125 GeV. Nuclear binding energy peaks at ~8 MeV/nucleon for iron-56. 1 eV = 1.602176634 × 10⁻¹⁹ J.
About Kilojoules
A kilojoule (kJ) is exactly 1,000 J and is the standard energy unit for food and physical chemistry. EU, Australian, and NZ food labels are mandatory in kJ: recommended adult intake is ~8,400 kJ/day. Bond dissociation energies: C-H bond 413 kJ/mol; C=C double bond 614 kJ/mol; N≡N triple bond 945 kJ/mol. Specific heat of water: 4.184 kJ/(kg·K). A cyclist riding at 150 W for one hour expends 540 kJ. Charpy and Izod impact toughness tests record results in J and kJ. 1 kJ = 1,000 J = 239.0 cal = 0.94782 BTU = 0.27778 Wh.
Quick Reference Table
| Electronvolts (eV) | Kilojoules (kJ) |
|---|---|
| 1 eV | 1.602 × 10-22 kJ |
| 2 eV | 3.204 × 10-22 kJ |
| 5 eV | 8.011 × 10-22 kJ |
| 10 eV | 1.602 × 10-21 kJ |
| 25 eV | 4.005 × 10-21 kJ |
| 50 eV | 8.011 × 10-21 kJ |
| 100 eV | 1.602 × 10-20 kJ |