Power and Energy
JtoeV
Convert joules (J) to electronvolts (eV).
Factor1 J = 6.241509e+18 eV
Converter
J
Accepts numbers or expressions, e.g. 150 + 14.7
Result
eV
Rendered to 6 significant figures.
Formula
Formula
eV = J × 6.241509e+18
Multiply any value in joules by 6.241509e+18 to obtain the value in electronvolts.
Worked example
Convert 1 J to eV.
- 01Start with 1 J.
- 02Multiply by the conversion factor: 1 × 6.241509e+18 = 6.24151e+18 eV.
Result1 J = 6.24151e+18 eV
Conversion table
| J | eV |
|---|---|
| 1 | 6.2415e+18 |
| 2 | 1.2483e+19 |
| 5 | 3.1208e+19 |
| 10 | 6.2415e+19 |
| 20 | 1.2483e+20 |
| 50 | 3.1208e+20 |
| 100 | 6.2415e+20 |
| 200 | 1.2483e+21 |
| 500 | 3.1208e+21 |
| 1000 | 6.2415e+21 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from J to eV?
1 J equals 6.241509e+18 eV. To convert, multiply the value in joules by 6.241509e+18.
How do I convert 1 J to eV?
1 J = 6.24151e+18 eV. For any value, multiply by 6.241509e+18.
How do I convert eV back to J?
Divide by the same factor — or equivalently, multiply by 1.602177e-19. So 1 eV = 1.60218e-19 J.
When would I need to convert joule to electronvolt?
Energy conversions are needed when reconciling fuel/electrical billing, calculating thermal duties, and aligning calorimetry or HHV/LHV figures across data sources.
Is the conversion exact?
The factor shown is precise to at least 7 significant figures. For most process-engineering work this is far better than instrument accuracy. For metrology or trade applications, refer to the relevant national standard (NIST, BIPM, ISO 80000).