Electronvolts (eV) to Joules (J) Converter
Enter a value to instantly convert between energy units.
1 Electronvolt = 1.6022e-19 Joule
Key Formulas
Kilocalorie → Kilojoule
kJ = kcal × 4.184Kilojoule → Kilocalorie
kcal = kJ × 0.239006Kilowatt-Hour → Joule
J = kWh × 3600000Joule → Kilowatt-Hour
kWh = J × 2.77778e-7Formula
J = eV × 1.602176634e-19One electronvolt equals exactly 1.602176634×10⁻¹⁹ joules, defined as the energy an electron gains when accelerated through a one-volt potential difference. This unit dominates atomic physics, quantum chemistry, and semiconductor engineering because it naturally matches electron binding energies and molecular bond strengths. Converting to joules expresses these quantum-scale energies in SI units for macroscopic calculations.
Source: NIST SP 811, Table B.8
Frequently Asked Questions
Real-World Examples
A semiconductor band gap engineer documents 3 eV bandgap = 4.81×10⁻¹⁹ J for LED materials.
1 eV = 1.602176634e-19 J
X-ray detector calibration at 1 keV (1000 eV) = 1.602×10⁻¹⁶ J per photon for energy resolution.
1000 eV = 1.602176634e-16 J
Particle accelerator producing 1 MeV protons = 1.602×10⁻¹³ J kinetic energy per particle.
1000000 eV = 1.602176634e-13 J
Visible light photon (blue ~450 nm) has energy ~2.8 eV = 4.5×10⁻¹⁹ J.
2.2 eV = 3.525e-19 J