Convert Joule to Electronvolt
Use this free converter to change joules (J) into electronvolts (eV). Joule and electronvolt both measure energy. As a quick reference, 1 J equals 6.2415e+18 eV, and 1 eV equals 1.6022e-19 J.
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Electronvolt (eV)
6.2415e+18
1 J = 6.2415e+18 eV
Energy conversion table
| Joule | Electronvolt |
|---|---|
| 0.01 | 6.2415e+16 |
| 0.1 | 6.2415e+17 |
| 0.5 | 3.1208e+18 |
| 1 | 6.2415e+18 |
| 2 | 1.2483e+19 |
| 3 | 1.8725e+19 |
| 5 | 3.1208e+19 |
| 10 | 6.2415e+19 |
| 20 | 1.2483e+20 |
| 25 | 1.5604e+20 |
| 50 | 3.1208e+20 |
| 100 | 6.2415e+20 |
| 1,000 | 6.2415e+21 |
How to convert Joule to Electronvolt
Multiply the joule value by 6.2415e+18 to get electronvolts.
- Enter the number of joules you want to convert.
- The converter instantly shows the equivalent value in electronvolts.
- Worked example: 15 J × 6.2415e+18 = 9.3623e+19 eV.
- Use the swap button to reverse the conversion (electronvolt to joule).
About these units
Joule (J)
- Definition
- The joule (J) is the SI unit of energy, the work done by a force of one newton over one meter.
- History
- Named after physicist James Prescott Joule, who studied the link between heat and work.
- Current use
- Joules measure energy, work, and heat throughout science and engineering.
Electronvolt (eV)
- Definition
- An electronvolt (eV) is the energy gained by an electron moving through a one-volt potential, a tiny amount of energy.
- History
- It became standard in atomic and particle physics in the 20th century.
- Current use
- Electronvolts measure energies of particles, photons, and chemical bonds.
Frequently asked questions
How many electronvolts are in a joule?
There are 6.2415e+18 eV in 1 J. To convert, multiply the number of joules by 6.2415e+18.
How do I convert joules to electronvolts?
Multiply the joule value by 6.2415e+18 to get electronvolts. For example, 10 J = 6.2415e+19 eV.
Is this joule-to-electronvolt converter free?
Yes. This converter is completely free, runs entirely in your browser, and requires no sign-up. Your inputs never leave your device.
Convert Joule to other energy units
| Unit | 1 Joule equals |
|---|---|
| Kilojoule (kJ) | 0.001 kJ |
| Calorie (cal) | 0.23900574 cal |
| Kilocalorie (kcal) | 0.00023900574 kcal |
| Watt Hour (Wh) | 0.00027777778 Wh |
| Kilowatt Hour (kWh) | 2.7778e-7 kWh |
| Electronvolt (eV) | 6.2415e+18 eV |
| British Thermal Unit (BTU) | 0.00094781712 BTU |
| Foot-Pound (ft·lb) | 0.73756215 ft·lb |