Ether to Wei Converter
Convert ether to wei instantly. Free, bidirectional, and fully in-browser.
About this tool
Ether to Wei Converter
Convert ether to wei instantly. Free, bidirectional, and fully in-browser.
1 ether equals 1e+18 wei — enter any ether value to convert it to wei instantly. This Ether to Wei converter is a client-side tool: it applies a single multiplication (wei = ETH × 1e+18) in your browser, updates the moment you type, and works in both directions — edit either field, or press swap, to convert wei back to ether. A reference table lists common ether values already converted, and nothing you enter is sent to a server.
How to use Ether to Wei Converter
- 1
Open Ether to Wei Converter on AltFTool — it loads instantly in your browser.
- 2
Type the value you want to convert into the Ether field.
- 3
Read the equivalent in wei 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 wei to ether.
Why use Ether to Wei Converter
Instant, both ways
The result updates as you type, and the swap button flips the conversion to wei → ether without reloading.
Exact Ethereum Unit math
The conversion uses the precise factor (wei = ETH × 1e+18), 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 ether measurement to wei for a spec, listing, or report.
- Checking ether↔wei figures while comparing products, datasets, or documentation.
- Learning the ether-to-wei relationship from the worked formula and the common-value table.
Frequently asked questions
How many wei are in an ether?
One ether is 1e+18 wei. Multiply the ether value by 1e+18 to convert. For example, 10 ETH = 1e+19 wei.
What is the formula to convert ether to wei?
wei = ETH × 1e+18. This tool applies it automatically and shows a worked example: 10 ETH = 1e+19 wei.
Can it convert wei back to ether?
Yes. Press the swap button, or type into the wei field, and the tool converts wei to ether using the inverse of the same relationship.
Is the conversion accurate?
It uses the standard Ethereum denomination definition (wei = ETH × 1e+18), 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 Ether to Wei 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/ether-to-wei-converter"
title="Ether to Wei 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/ether-to-wei-converter?utm_source=embed&utm_medium=widget" rel="nofollow">AltFTool — free online tools</a></p>