Stone to Carat Converter
Convert stones to carats instantly. Free, bidirectional, and fully in-browser.
About this tool
Stone to Carat Converter
Convert stones to carats instantly. Free, bidirectional, and fully in-browser.
1 stone equals 31751.4659 carats — enter any stone value to convert it to carats instantly. This Stone to Carat converter is a client-side tool: it applies a single multiplication (ct = st × 31751.4659) in your browser, updates the moment you type, and works in both directions — edit either field, or press swap, to convert carats back to stones. A reference table lists common stone values already converted, and nothing you enter is sent to a server.
How to use Stone to Carat Converter
- 1
Open Stone to Carat Converter on AltFTool — it loads instantly in your browser.
- 2
Type the value you want to convert into the Stone field.
- 3
Read the equivalent in carats 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 carats to stones.
Why use Stone to Carat Converter
Instant, both ways
The result updates as you type, and the swap button flips the conversion to carat → stone without reloading.
Exact Mass math
The conversion uses the precise factor (ct = st × 31751.4659), 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 a stone measurement to carats for a spec, listing, or report.
- Checking stone↔carat figures while comparing products, datasets, or documentation.
- Learning the stone-to-carat relationship from the worked formula and the common-value table.
Frequently asked questions
How many carats are in a stone?
One stone is 31751.4659 carats. Multiply the stone value by 31751.4659 to convert. For example, 10 st = 317514.659 ct.
What is the formula to convert stones to carats?
ct = st × 31751.4659. This tool applies it automatically and shows a worked example: 10 st = 317514.659 ct.
Can it convert carats back to stones?
Yes. Press the swap button, or type into the carat field, and the tool converts carats to stones using the inverse of the same relationship.
Is the conversion accurate?
It uses the standard mass and weight definition (ct = st × 31751.4659), 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 Stone to Carat 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/stones-to-carats-converter"
title="Stone to Carat 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/stones-to-carats-converter?utm_source=embed&utm_medium=widget" rel="nofollow">AltFTool — free online tools</a></p>