Electronvolt (eV)
Exactly 1.602176634e-19 joules (elementary charge × one volt).
What is an electronvolt?
- Symbol
- eV
- Quantity
- Energy
- Unit system
- SI-accepted
- Definition
- Exactly 1.602176634e-19 joules (elementary charge × one volt).
- Exact
- Yes, the value is exact by definition
- Source
- SI Brochure, 9th edition (BIPM, 2019)
Common applications
Used in atomic, nuclear and particle physics for the energy of particles and photons.
Electronvolt in other energy units
- 1 eV = 1.602176634e-19 JElectronvolt to Joule converter
- 1 eV = 1.602176634e-22 kJKilojoule
- 1 eV = 1.602176634e-25 MJMegajoule
- 1 eV = 4.45049065e-23 WhWatt-hour
- 1 eV = 4.45049065e-26 kWhKilowatt-hour
- 1 eV ≈ 3.829294058e-20 calCalorie (thermochemical)
- 1 eV ≈ 3.829294058e-23 kcalKilocalorie (thermochemical)
- 1 eV ≈ 1.518570443e-22 BTUBritish thermal unit (IT)
- 1 eV ≈ 1.181704842e-19 ft·lbfFoot-pound-force
- 1 eV = 1.602176634e-12 ergErg
Electronvolt quick reference
| Electronvolt | Joule | Kilojoule | Kilocalorie (thermochemical) |
|---|---|---|---|
| 1 eV | = 1.602176634e-19 J | = 1.602176634e-22 kJ | ≈ 3.829294058e-23 kcal |
| 10 eV | = 1.602176634e-18 J | = 1.602176634e-21 kJ | ≈ 3.829294058e-22 kcal |
| 100 eV | = 1.602176634e-17 J | = 1.602176634e-20 kJ | ≈ 3.829294058e-21 kcal |
| 1000 eV | = 1.602176634e-16 J | = 1.602176634e-19 kJ | ≈ 3.829294058e-20 kcal |
Where the electronvolt fits
The next larger energy unit is the erg (erg). 1 eV = 1.602176634e-12 erg, and 1 erg ≈ 624150907400 eV.
Frequently asked questions
- How many joules are in one electronvolt?
- One electronvolt = 1.602176634e-19 J (joules).
- How many kilojoules are in one electronvolt?
- One electronvolt = 1.602176634e-22 kJ (kilojoules).
- How many kilocalories are in one electronvolt?
- One electronvolt ≈ 3.829294058e-23 kcal (kilocalories).