Convert Carats to Grams
Convert Carats to Grams instantly. 1 Carat (ct) equals 0.2 Grams (g).
Carats to Grams conversion table
| Carats (ct) | Grams (g) |
|---|---|
| 1 ct | 0.2 g |
| 2 ct | 0.4 g |
| 3 ct | 0.6 g |
| 5 ct | 1 g |
| 10 ct | 2 g |
| 20 ct | 4 g |
| 50 ct | 10 g |
| 100 ct | 20 g |
| 500 ct | 100 g |
| 1,000 ct | 200 g |
1 Carat = 0.2 Grams · multiply Carats by 0.2
About converting Carats to Grams
Carats (ct) and Grams (g) are both units of weight & mass, so converting between them is a single multiplication: multiply your Carats figure by 0.2. Ten Carats comes to 2 Grams, and a hundred works out at 20 Grams.
Rule of thumb: going from Carats to Grams divides, so the figure always shrinks — it takes about 5 Carats to make a single Gram. 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 Gram?
The gram sits oddly in SI: the kilogram, not the gram, is the official base unit of mass, which makes mass the only quantity whose base unit carries a prefix built into its name. The gram was defined in 1795 as the mass of a cubic centimetre of water at the melting point of ice — a definition that tied mass neatly to length and made the young metric system self-consistent. It survives as the working unit of nutrition labels, recipes, postage and laboratory work: anything small enough that kilograms would force you into decimals.
To put both in perspective: a typical engagement-ring diamond weighs about one carat, while a paperclip weighs about a gram.
The converter above updates as you type, and the table lists common values for quick reference. Need the opposite direction? Use the Grams to Carats converter, or browse all Weight & Mass converters.
Frequently asked questions
How many Grams are in one Carat?
There are 0.2 Grams in one Carat.
How do I convert Carats to Grams?
Multiply the number of Carats by 0.2. For example, 10 Carats = 2 Grams.
What is 100 Carats in Grams?
100 Carats is equal to 20 Grams.
How do I convert Grams to Carats?
Multiply the Grams value by 5 (or divide by 0.2).
Is this Carats to Grams conversion exact?
Yes, exactly. Both units are fixed against the same base by definition, and 1 Carat = 0.2 Grams is the complete value — nothing is rounded away.
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 Gram?
The gram sits oddly in SI: the kilogram, not the gram, is the official base unit of mass, which makes mass the only quantity whose base unit carries a prefix built into its name. The gram was defined in 1795 as the mass of a cubic centimetre of water at the melting point of ice — a definition that tied mass neatly to length and made the young metric system self-consistent. It survives as the working unit of nutrition labels, recipes, postage and laboratory work: anything small enough that kilograms would force you into decimals.