J to Electronvolts converter (J to eV)
Convert J (J) to Electronvolts (eV) with this free calculator. Type a value, press Convert, and the page applies the same factor shown in the formula below — no rounded shortcut, and nothing is stored on a server.
How to convert J to Electronvolts
1 joule (J) is equal to 6.2415 × 10¹⁸ electronvolts (eV).
E(eV) = E(J) × 6.2415 × 10¹⁸
Multiply the energy in joules by 6.2415 × 10¹⁸:
Example: Convert 1 J to eV:
E(eV) = 1 × 6.2415 × 10¹⁸ = 6.2415 × 10¹⁸ eV
What is a J?
The J (J) is the starting or target unit on this page. Use the calculator above to convert values without looking up the factor by hand.
What is a Electronvolts?
The Electronvolts (eV) is the starting or target unit on this page. Use the calculator above to convert values without looking up the factor by hand.
This page converts energy from J into Electronvolts. One J equals 6.241509e+18 eV.
J to Electronvolts conversion table
Common J values and the matching eV result, calculated with the same factor as the widget. Highlight a nearby row if you want a quick check without entering a number.
| J (J) | Electronvolts (eV) |
|---|---|
| 0 J | 0 eV |
| 1 J | 6.241509e+18 eV |
| 5 J | 3.120755e+19 eV |
| 10 J | 6.241509e+19 eV |
How this calculator works
The form on this page is a J-to-Electronvolts converter. After you enter a number, JavaScript multiplies or rearranges it with the published conversion factor and writes the eV result in the output box. The step-by-step panel repeats the arithmetic so you can copy it into homework or a spreadsheet.
Reviewed by Hamsen, founder of GigaTables and a biology engineer. See the about page for how formulas are checked before a tool is published.
FAQ
How many eV are in 1 J?
1 J = 6.241509e+18 eV.
How do I convert J to Electronvolts?
Multiply the energy in joules by 6.2415 × 10¹⁸:
Is this J to eV converter free?
Yes. GigaTables calculators are free to use in a browser. You do not need an account, and the values you type are not uploaded.