Convert carats to grams and grams to carats instantly. Essential converter for gemstones and precious stones.
Multiply the carat value by 0.2. The metric carat was standardized in 1907 as exactly 200 milligrams (0.2 grams). This is one of the few unit conversions that is perfectly exact with no rounding involved.
| Carats | Grams |
|---|---|
| 0.25 | 0.0500 |
| 0.5 | 0.1000 |
| 0.75 | 0.1500 |
| 2 | 0.4000 |
| 3.5 | 0.7000 |
| 5 | 1.0000 |
| 15 | 3.0000 |
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One carat equals exactly 0.2 grams (200 milligrams).
A carat (ct) measures gemstone weight (0.2 grams). A karat (K or kt) measures gold purity on a scale of 24 parts. They are completely different units despite the similar spelling.
The carat originated from the carob seed, which was historically used as a balance weight due to its remarkably consistent mass. It was standardized to exactly 0.2 grams in 1907.
A typical engagement ring diamond ranges from 0.5 to 1.5 carats, which is 0.1 to 0.3 grams. A 1-carat diamond weighs exactly 0.2 grams.