Electronvolt to Joule Converter
Convert electronvolts to joules instantly. Free, bidirectional, and fully in-browser.
About this tool
Electronvolt to Joule Converter
Convert electronvolts to joules instantly. Free, bidirectional, and fully in-browser.
1 electronvolt equals 1.602177e-19 joules — enter any electronvolt value to convert it to joules instantly. This Electronvolt to Joule converter is a client-side tool: it applies a single multiplication (J = eV × 1.602177e-19) in your browser, updates the moment you type, and works in both directions — edit either field, or press swap, to convert joules back to electronvolts. A reference table lists common electronvolt values already converted, and nothing you enter is sent to a server.
How to use Electronvolt to Joule Converter
- 1
Open Electronvolt to Joule Converter on AltFTool — it loads instantly in your browser.
- 2
Type the value you want to convert into the Electronvolt field.
- 3
Read the equivalent in joules in the result field, and copy it if needed.
- 4
Use the decimal-places slider for more or less precision, or press swap to convert joules to electronvolts.
Why use Electronvolt to Joule Converter
Instant, both ways
The result updates as you type, and the swap button flips the conversion to joule → electronvolt without reloading.
Exact Energy math
The conversion uses the precise factor (J = eV × 1.602177e-19), so the number matches a manual calculation to the decimal places you choose.
Adjustable precision
A slider sets 0–10 decimal places, and very small or very large results switch to scientific notation instead of rounding to zero.
Private and free
Everything runs locally in your browser — no upload, no account, no limit on conversions.
Common use cases
- Converting an electronvolt measurement to joules for a spec, listing, or report.
- Checking electronvolt↔joule figures while comparing products, datasets, or documentation.
- Learning the electronvolt-to-joule relationship from the worked formula and the common-value table.
Frequently asked questions
How many joules are in an electronvolt?
One electronvolt is 1.602177e-19 joules. Multiply the electronvolt value by 1.602177e-19 to convert. For example, 10 eV = 1.602177e-18 J.
What is the formula to convert electronvolts to joules?
J = eV × 1.602177e-19. This tool applies it automatically and shows a worked example: 10 eV = 1.602177e-18 J.
Can it convert joules back to electronvolts?
Yes. Press the swap button, or type into the joule field, and the tool converts joules to electronvolts using the inverse of the same relationship.
Is the conversion accurate?
It uses the standard energy and work definition (J = eV × 1.602177e-19), not a rounded approximation, so results are exact to the number of decimal places you select.
Does this work offline and stay private?
Yes. The converter is a browser-side script with no network calls: your values are never uploaded, and once the page has loaded it keeps working without a connection.
Embed this tool on your site
Add the Electronvolt to Joule Converter widget to your blog or website — free, responsive, no signup. Just keep the “Widget by AltFTool” credit link visible.
<iframe src="https://www.altftool.com/embed/widget/electronvolts-to-joules-converter"
title="Electronvolt to Joule Converter — free AltFTool widget"
width="100%" height="640" style="border:0;border-radius:12px;overflow:hidden"
loading="lazy" referrerpolicy="no-referrer-when-downgrade" allow="clipboard-write"></iframe>
<p style="font-size:12px;margin:4px 0 0">Widget by <a href="https://www.altftool.com/tools/all/electronvolts-to-joules-converter?utm_source=embed&utm_medium=widget" rel="nofollow">AltFTool — free online tools</a></p>