Joules (J) to Electronvolts (eV) Converter
Enter a value to instantly convert between energy units.
1 Joule = 6.2415e+18 Electronvolt
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
eV = J ÷ 1.602176634e-19An electronvolt is the energy gained by an electron accelerating through one volt — about 1.602×10⁻¹⁹ joules. It's a convenient unit for atomic and subatomic physics, chemistry, and electronics. One eV is the energy scale of chemical bonds; a typical chemical reaction involves several eV per molecule.
Source: NIST SP 811, Table B.8
Frequently Asked Questions
Real-World Examples
A physics student learning that one electronvolt equals exactly 1.602×10⁻¹⁹ J — the fundamental charge relationship.
1.602e-19 J = 1 eV
A researcher calculating 10 eV of ionization energy converts to 1.602×10⁻¹⁸ J for the particle physics paper.
1.602e-18 J = 10 eV
An ion accelerator operating at 1 MeV (1 million eV) reports 1.602×10⁻¹⁶ J in the engineering log.
1.602e-16 J = 1000000 eV
A nuclear physicist noting that 1 GeV equals 1.602×10⁻¹³ J for the accelerator design document.
1.602e-13 J = 1000000000 eV