How to convert electronvolts to joules
J = eV × 1.602176634×10⁻¹⁹Multiply the value in electronvolts by 1.602176634×10⁻¹⁹. To go the other way, multiply by 6.241509074×10¹⁸ (or divide by 1.602176634×10⁻¹⁹).
An electronvolt is smaller than a joule: it takes 6.241509074×10¹⁸ electronvolts to make one joule.
Worked examples
- 1 electronvolt1 eV × 1.602176634×10⁻¹⁹ = 1.602176634×10⁻¹⁹ J
- 5 electronvolts5 eV × 1.602176634×10⁻¹⁹ = 8.01088317×10⁻¹⁹ J
- 10 electronvolts10 eV × 1.602176634×10⁻¹⁹ = 1.602176634×10⁻¹⁸ J
- 20 electronvolts20 eV × 1.602176634×10⁻¹⁹ = 3.204353268×10⁻¹⁸ J
- 100 electronvolts100 eV × 1.602176634×10⁻¹⁹ = 1.602176634×10⁻¹⁷ J
Electronvolts to joules conversion table
Values are calculated by the conversion engine and rounded to 8 significant figures.
| Electronvolts (eV) | Joules (J) |
|---|---|
| 0.1 eV | 1.6021766×10⁻²⁰ J |
| 0.25 eV | 4.0054416×10⁻²⁰ J |
| 0.5 eV | 8.0108832×10⁻²⁰ J |
| 1 eV | 1.6021766×10⁻¹⁹ J |
| 2 eV | 3.2043533×10⁻¹⁹ J |
| 3 eV | 4.8065299×10⁻¹⁹ J |
| 4 eV | 6.4087065×10⁻¹⁹ J |
| 5 eV | 8.0108832×10⁻¹⁹ J |
| 6 eV | 9.6130598×10⁻¹⁹ J |
| 7 eV | 1.1215236×10⁻¹⁸ J |
| 8 eV | 1.2817413×10⁻¹⁸ J |
| 9 eV | 1.441959×10⁻¹⁸ J |
| 10 eV | 1.6021766×10⁻¹⁸ J |
| Electronvolts (eV) | Joules (J) |
|---|---|
| 12 eV | 1.922612×10⁻¹⁸ J |
| 15 eV | 2.403265×10⁻¹⁸ J |
| 20 eV | 3.2043533×10⁻¹⁸ J |
| 25 eV | 4.0054416×10⁻¹⁸ J |
| 30 eV | 4.8065299×10⁻¹⁸ J |
| 40 eV | 6.4087065×10⁻¹⁸ J |
| 50 eV | 8.0108832×10⁻¹⁸ J |
| 75 eV | 1.2016325×10⁻¹⁷ J |
| 100 eV | 1.6021766×10⁻¹⁷ J |
| 250 eV | 4.0054416×10⁻¹⁷ J |
| 500 eV | 8.0108832×10⁻¹⁷ J |
| 1,000 eV | 1.6021766×10⁻¹⁶ J |
About the units
Electronvolt (eV)
The energy an electron gains across one volt: exactly 1.602176634 × 10⁻¹⁹ J. One electronvolt equals 1.602176634×10⁻¹⁹ joules (J).
Joule (J)
The SI unit of energy: the work done by a force of one newton over one metre, or one watt for one second. Lifting an apple by one metre takes about 1 J.
Frequently asked questions
How many joules are in one electronvolt?
There are 1.602176634×10⁻¹⁹ joules in one electronvolt, and this value is exact by definition.
How do I convert electronvolts to joules?
Multiply the number of electronvolts by 1.602176634×10⁻¹⁹. For example, 10 eV × 1.602176634×10⁻¹⁹ = 1.602176634×10⁻¹⁸ J.
How many electronvolts are in one joule?
One joule equals 6.241509074×10¹⁸ electronvolts. That is the reverse factor, 1 ÷ 1.602176634×10⁻¹⁹.
What is 10 electronvolts in joules?
10 eV = 1.602176634×10⁻¹⁸ J.
Is this eV to J converter accurate?
Yes. Both units are defined exactly in terms of SI units, so the conversion factor is exact; results are shown to 12 significant figures by default and you can change precision in the converter. Calculations run in your browser using the same tested engine that generated this page.