Carat to Stone Converter (ct to st)

How to Convert Carat to Stone

Formula: Stone = Carat × 0.00003149

Example: 1 ct = 0.00003149 st

You can also use the interactive converter above. Simply enter any Carat value and the equivalent Stone value will appear instantly. Click the ⇄ button to reverse the conversion.

Knowing where Carat and Stone come from makes the conversion easier to remember. Here is the context, plus a quick FAQ.

Step-by-step example — Convert 1 ct to st:

What is Carat and Stone?

A Carat (ct) is a unit of mass equal to exactly 200 milligrams, used almost exclusively for gemstones and pearls.

A Stone (st) equals 14 pounds and is a traditional unit still used for body weight in the UK and Ireland.

Real World Uses of Carat to Stone Conversion

• Carat: Commonly used for grading pearls in the gem trade.
• Stone: Commonly used for describing livestock weight on traditional British farms.
• Carat: Commonly used by jewelers to price diamonds and gemstones — a higher carat weight means a larger stone.
• Stone: Commonly used in the UK and Ireland for reporting body weight in everyday conversation and healthcare.

Frequently Asked Questions

What is the formula to convert Carat to Stone?

The formula is: Stone = Carat x 0.00003149. Multiply any Carat value by 0.00003149 to get the equivalent in Stone.

What is 1 Carat in Stone?

1 ct = 0.00003149 st.

How many Carat are in 1 Stone?

1 st = 31756.11305176 ct.

Is Carat bigger or smaller than Stone?

Carat is smaller than Stone. 1 Stone = 31756.11305176 ct.

What is 5 ct in st?

5 ct = 0.0001574730444 st.

What is 5 st in ct?

5 st = 158,757.3295 ct.

Is carat the same as karat?

No — carat (ct) measures the weight of a gemstone, while karat (kt) measures gold purity out of 24 parts. The different spelling helps tell them apart.