Electronvolts to Joules Converter
Enter energy in eV, keV, MeV, or GeV to get joules — or enter joules to convert back. Uses 1 eV = 1.602176634×10⁻¹⁹ J (exact).
Energy Converter
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1 eV = 1.602176634×10⁻¹&sup9; J | 1 J = 6.24150907×10¹&sup8; eV
eV ↔ J Reference Table
Common energy values in electronvolts and their joule equivalents
| Electronvolts | Joules (J) | Context |
|---|
1 eV = 1.602176634×10⁻¹&sup9; J (CODATA 2018, exact since 2019 SI revision)
Summary
Enter energy in eV, keV, MeV, or GeV to get joules — or enter joules to convert back. Uses 1 eV = 1.602176634×10⁻¹⁹ J (exact).
How it works
- Select the input unit: eV, keV, MeV, or GeV from the dropdown.
- Enter any numeric value — whole numbers, decimals, or scientific notation (e.g. 1.6e6).
- The joule equivalent appears instantly below.
- Switch to Joules → eV mode for the reverse conversion.
- Click any result field to copy it to the clipboard.
Use cases
- Convert photon energy in electronvolts to joules for optics or spectroscopy.
- Translate particle-accelerator beam energies from MeV/GeV into SI joules.
- Convert ionization or binding energy between eV and J in chemistry homework.
- Check thermal energy kT in eV against SI joule equivalents for solid-state physics.
- Cross-reference nuclear reaction Q-values in MeV with SI joules.
Frequently Asked Questions
Last updated: 2026-07-22 ·
Reviewed by Nham Vu