Electronvolt (eV)
The electronvolt (eV) is the energy an electron gains across one volt, exactly 1.602176634 × 10⁻¹⁹ J since the 2019 SI redefinition.
Symbol: eV
Quantity: energy, work and heat
SI relation: 1 eV = 1.602176634 × 10⁻¹⁹ J (exact)
Derivation: 1 eV = e × 1 V = 1.602176634 × 10⁻¹⁹ J (exact since 2019)
Exact: yes, by definition
Typical uses
- Atomic and particle physics
- Semiconductor band gaps (silicon ≈ 1.12 eV)
- Photon energies and X-rays (keV)
Convert electronvolts to other units
| Conversion | 1 eV equals | Reverse |
|---|---|---|
| electronvolt to joule | 1.602176634 × 10⁻¹⁹ J | joule to electronvolt |
| electronvolt to kilojoule | 1.602176634 × 10⁻²² kJ | kilojoule to electronvolt |
| electronvolt to kilocalorie | 3.829294058 × 10⁻²³ kcal | kilocalorie to electronvolt |
| electronvolt to kilowatt-hour | 4.45049065 × 10⁻²⁶ kWh | kilowatt-hour to electronvolt |
| electronvolt to BTU | 1.518570443 × 10⁻²² BTU | BTU to electronvolt |
| electronvolt to megajoule | 1.602176634 × 10⁻²⁵ MJ | megajoule to electronvolt |
| electronvolt to calorie | 3.829294058 × 10⁻²⁰ cal | calorie to electronvolt |
| electronvolt to watt-hour | 4.45049065 × 10⁻²³ Wh | watt-hour to electronvolt |
| electronvolt to therm | 1.518933028 × 10⁻²⁷ thm | therm to electronvolt |
| electronvolt to foot-pound | 1.181704842 × 10⁻¹⁹ ft·lbf | foot-pound to electronvolt |
| electronvolt to erg | 1.602176634 × 10⁻¹² erg | erg to electronvolt |
Open the Energy Converter to convert any value between all units.
Sources
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 8 and the fixed elementary charge e.
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Electronvolt (eV). Retrieved October 17, 2026, from https://scientificconverters.com/units/electronvolt/
IEEE
Scientific Converters, "Electronvolt (eV)," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/units/electronvolt/