Convert Carats to Stones
Convert Carats to Stones instantly. 1 Carat (ct) equals 0.00003149 Stones (st).
Carats to Stones conversion table
| Carats (ct) | Stones (st) |
|---|---|
| 1 ct | 0.00003149 st |
| 2 ct | 0.00006299 st |
| 3 ct | 0.00009448 st |
| 5 ct | 0.0001575 st |
| 10 ct | 0.0003149 st |
| 20 ct | 0.0006299 st |
| 50 ct | 0.001575 st |
| 100 ct | 0.003149 st |
| 500 ct | 0.01575 st |
| 1,000 ct | 0.03149 st |
1 Carat = 0.00003149 Stones · multiply Carats by 0.00003149
About converting Carats to Stones
Carats (ct) and Stones (st) are both units of weight & mass, so converting between them is a single multiplication: multiply your Carats figure by 0.00003149. Ten Carats comes to 0.0003149 Stones, and a hundred works out at 0.003149 Stones.
Rule of thumb: going from Carats to Stones divides, so the figure always shrinks — it takes about 31,751.47 Carats to make a single Stone. If your answer came out bigger, you have the conversion the wrong way round.
What is a Carat?
The metric carat is 0.2 grams exactly, standardised early in the twentieth century to replace a tangle of local carats that differed from one gem market to the next. Its name is traditionally traced to the carob seed, once used as a counterweight for small valuables. The trap is the near-identical karat, which is not a mass at all — it measures gold purity in twenty-fourths, so 18-karat gold is eighteen parts gold to six of other metal. Jewellers also split the carat into 100 points, which is why a "fifty-point" diamond is simply half a carat.
What is a Stone?
The stone is fourteen pounds and, outside Britain and Ireland, essentially extinct. There it is still how people state body weight: a Briton says "eleven stone four", meaning eleven stone plus four pounds, and the plural stays stone in that construction — never "eleven stones". Americans give the identical weight as a single number in pounds, which is why British figures baffle them. The unit predates standardisation and was once a moving target, with a stone of wool, cheese or glass all weighing different amounts, and it is no longer permitted for trade in the UK at all.
To put both in perspective: a typical engagement-ring diamond weighs about one carat, while most adults weigh somewhere between 9 and 14 stone.
The converter above updates as you type, and the table lists common values for quick reference. Need the opposite direction? Use the Stones to Carats converter, or browse all Weight & Mass converters.
Frequently asked questions
How many Stones are in one Carat?
There are 0.00003149 Stones in one Carat.
How do I convert Carats to Stones?
Multiply the number of Carats by 0.00003149. For example, 10 Carats = 0.0003149 Stones.
What is 100 Carats in Stones?
100 Carats is equal to 0.003149 Stones.
How do I convert Stones to Carats?
Multiply the Stones value by 31,751.47 (or divide by 0.00003149).
Is this Carats to Stones conversion exact?
The definition is exact — Carats and Stones are both fixed against the same base by international agreement — but the decimal shown here is rounded for readability, because the true ratio does not terminate. For engineering or scientific work, carry more decimal places than this page displays.
What is a Carat?
The metric carat is 0.2 grams exactly, standardised early in the twentieth century to replace a tangle of local carats that differed from one gem market to the next. Its name is traditionally traced to the carob seed, once used as a counterweight for small valuables. The trap is the near-identical karat, which is not a mass at all — it measures gold purity in twenty-fourths, so 18-karat gold is eighteen parts gold to six of other metal. Jewellers also split the carat into 100 points, which is why a "fifty-point" diamond is simply half a carat.
What is a Stone?
The stone is fourteen pounds and, outside Britain and Ireland, essentially extinct. There it is still how people state body weight: a Briton says "eleven stone four", meaning eleven stone plus four pounds, and the plural stays stone in that construction — never "eleven stones". Americans give the identical weight as a single number in pounds, which is why British figures baffle them. The unit predates standardisation and was once a moving target, with a stone of wool, cheese or glass all weighing different amounts, and it is no longer permitted for trade in the UK at all.