About this tool

Carat to Stone Converter

Convert carats to stones instantly. Free, bidirectional, and fully in-browser.

1 carat equals 3.149461e-5 stones — enter any carat value to convert it to stones instantly. This Carat to Stone converter is a client-side tool: it applies a single multiplication (st = ct × 3.149461e-5) in your browser, updates the moment you type, and works in both directions — edit either field, or press swap, to convert stones back to carats. A reference table lists common carat values already converted, and nothing you enter is sent to a server.

How to use Carat to Stone Converter

1. 1

   Open Carat to Stone Converter on AltFTool — it loads instantly in your browser.

2. 2

   Type the value you want to convert into the Carat field.

3. 3

   Read the equivalent in stones in the result field, and copy it if needed.

4. 4

   Use the decimal-places slider for more or less precision, or press swap to convert stones to carats.

Why use Carat to Stone Converter

• Instant, both ways

  The result updates as you type, and the swap button flips the conversion to stone → carat without reloading.

• Exact Mass math

  The conversion uses the precise factor (st = ct × 3.149461e-5), 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 carat measurement to stones for a spec, listing, or report.
• Checking carat↔stone figures while comparing products, datasets, or documentation.
• Learning the carat-to-stone relationship from the worked formula and the common-value table.

Frequently asked questions