Convert joules to eV
Convert joules to electronvolts by entering a value below.
How to Convert Joules to Electronvolts
The joule and electronvolt are both units of energy. By definition, 1 joule equals exactly 6.2415090745e18 electronvolts. This means to convert joules to electronvolts, you multiply by 6.2415090745e18.
Formula
Step-by-Step Example
Convert 5 J to electronvolts:
We need to convert joules to electronvolts
Since 1 J = 6.2415090745e18 eV, multiply by 6.2415090745e18
5 × 6.2415090745e18 = 3.1207545372e19
5 J = 3.1207545372e19 eV
Joule to Electronvolt Conversion Table
Quick reference table for common joule to electronvolt conversions. Click any value for detailed calculation.
| Joules (J) | Electronvolts (eV) |
|---|---|
| 0.1 J | 6.2415090745e17 eV |
| 0.5 J | 3.1207545372e18 eV |
| 1 J | 6.2415090745e18 eV |
| 2 J | 1.2483018149e19 eV |
| 5 J | 3.1207545372e19 eV |
| 10 J | 6.2415090745e19 eV |
| 25 J | 1.5603772686e20 eV |
| 50 J | 3.1207545372e20 eV |
| 100 J | 6.2415090745e20 eV |
About These Units
Joule (J)
The joule (J) is the SI unit of energy equal to one watt-second or one newton-meter. Joules measure work, heat, and electrical energy. One joule equals approximately 0.239 calories. Lifting a 100g apple one meter requires about 1 joule. Named after physicist James Prescott Joule.
Electronvolt (eV)
An electronvolt (eV) is the energy gained by an electron accelerated through 1 volt potential difference, equal to 1.602×10⁻¹⁹ joules. Electronvolts measure atomic and molecular energies, photon energy (visible light: 1.6-3.3 eV), and particle physics. X-rays range from 100 eV to 100 keV.
Frequently Asked Questions
How do I convert joules to electronvolts?
To convert joules to electronvolts, multiply the value by 6.2415090745e18. For example, 10 J = 6.2415090745e19 eV.
How many electronvolts are in 1 joule?
1 joule equals 6.2415090745e18 electronvolts.
What is the formula for joules to electronvolts?
The formula is: eV = J × 6.2415090745e18.