Grain to Carat Converter
Convert grains to carats instantly. Free, bidirectional, and fully in-browser.
About this tool
Grain to Carat Converter
Convert grains to carats instantly. Free, bidirectional, and fully in-browser.
1 grain equals 0.32399455 carats — enter any grain value to convert it to carats instantly. This Grain to Carat converter is a client-side tool: it applies a single multiplication (ct = gr × 0.32399455) in your browser, updates the moment you type, and works in both directions — edit either field, or press swap, to convert carats back to grains. A reference table lists common grain values already converted, and nothing you enter is sent to a server.
How to use Grain to Carat Converter
- 1
Open Grain to Carat Converter on AltFTool — it loads instantly in your browser.
- 2
Type the value you want to convert into the Grain 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 grains.
Why use Grain to Carat Converter
Instant, both ways
The result updates as you type, and the swap button flips the conversion to carat → grain without reloading.
Exact Mass math
The conversion uses the precise factor (ct = gr × 0.32399455), 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 grain measurement to carats for a spec, listing, or report.
- Checking grain↔carat figures while comparing products, datasets, or documentation.
- Learning the grain-to-carat relationship from the worked formula and the common-value table.
Frequently asked questions
How many carats are in a grain?
One grain is 0.32399455 carats. Multiply the grain value by 0.32399455 to convert. For example, 10 gr = 3.2399455 ct.
What is the formula to convert grains to carats?
ct = gr × 0.32399455. This tool applies it automatically and shows a worked example: 10 gr = 3.2399455 ct.
Can it convert carats back to grains?
Yes. Press the swap button, or type into the carat field, and the tool converts carats to grains using the inverse of the same relationship.
Is the conversion accurate?
It uses the standard mass and weight definition (ct = gr × 0.32399455), 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 Grain 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/grains-to-carats-converter"
title="Grain 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/grains-to-carats-converter?utm_source=embed&utm_medium=widget" rel="nofollow">AltFTool — free online tools</a></p>