Electronvolts ↔ Joules Converter
Convert between electronvolts (eV) and joules (J) instantly
📚 Electronvolts ↔ Joules Conversion Details
Electronvolts to Joules Formula
To convert electronvolts to joules, multiply the eV value by 1.602176634×10⁻¹⁹.
Joules to Electronvolts Formula
To convert joules to electronvolts, multiply the joules value by 6.241509074×10¹⁸.
Bidirectional Conversion
This converter works both ways simultaneously:
- Type in eV → joules updates automatically
- Type in joules → eV updates automatically
- No buttons to click - works as you type
Common Uses
- Particle physics
- Atomic physics
- Quantum mechanics
- Energy level calculations
📏 What are Electronvolts?
The electronvolt (symbol: eV) is a unit of energy equal to approximately 1.602×10⁻¹⁹ joules. It is defined as the amount of kinetic energy gained by a single electron accelerating from rest through an electric potential difference of one volt in vacuum.
1 eV = 1.602176634 × 10⁻¹⁹ J (exact)
1 J = 6.241509074 × 10¹⁸ eV
// Example 1: 5 eV to joules
5 × 1.602176634e-19 = 8.01088317e-19 J
// Example 2: 1.5×10⁻¹⁸ J to eV
1.5e-18 × 6.241509074e18 = 9.362263611 eV
📊 Common eV to J Conversions
| Electronvolts | Joules | Scientific Notation |
|---|---|---|
| 1 eV | 1.602176634×10⁻¹⁹ J | 1.602176634e-19 |
| 1 keV (1000 eV) | 1.602176634×10⁻¹⁶ J | 1.602176634e-16 |
| 1 MeV (10⁶ eV) | 1.602176634×10⁻¹³ J | 1.602176634e-13 |
| 1 GeV (10⁹ eV) | 1.602176634×10⁻¹⁰ J | 1.602176634e-10 |
| 1 TeV (10¹² eV) | 1.602176634×10⁻⁷ J | 1.602176634e-7 |
| 1 J | 6.241509074×10¹⁸ eV | 6.241509074e18 |
🎯 Energy Scale Reference
Typical Energy Ranges:
- Chemical bond energies: 1-10 eV
- Visible photon energies: 1.6-3.1 eV
- Medical X-rays: 10-100 keV
- Nuclear gamma rays: 0.1-10 MeV
- Cosmic rays: 1 GeV - 1 TeV+
- LHC proton collisions: 6.5 TeV per beam
❓ Frequently Asked Questions
A: Electronvolts are convenient for atomic-scale energies where joules would involve very small decimal numbers (10⁻¹⁹ scale). 1 eV is the energy gained by an electron moving through 1 volt.
A: Yes! Since the 2019 SI redefinition, 1 eV = 1.602176634×10⁻¹⁹ J exactly (no uncertainty).
A: Both input fields work simultaneously. When you change the eV value, joules updates automatically. When you change joules, eV updates automatically.
A: keV (kilo-electronvolts, 10³ eV), MeV (mega-electronvolts, 10⁶ eV), GeV (giga-electronvolts, 10⁹ eV), TeV (tera-electronvolts, 10¹² eV).