Grain to Carat Converter.
The smallest common unit in the avoirdupois system, used in ballistics and medicine. Converting to carats: Exactly 200 milligrams, the standard unit for gemstone and diamond weight. One grain equals 0.32399455 ct.
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Conversion formula
Divide the grain value by 3.086471671 to get carats. (factor: 0.32399455)
1 gr = 0.32399455 ct
Quick reference table
| gr | ct |
|---|---|
| 1 gr | 0.32399455 ct |
| 2 gr | 0.6479891 ct |
| 5 gr | 1.61997275 ct |
| 10 gr | 3.2399455 ct |
| 25 gr | 8.09986375 ct |
| 50 gr | 16.1997275 ct |
| 100 gr | 32.399455 ct |
| 250 gr | 80.9986375 ct |
Need the reverse? Try ourCarat to Grain.
Grain to Carat FAQ
How many carats are in one grain?
One grain equals 0.32399455 ct. Multiply by 0.32399455 to convert any value.
How do you convert gr to ct?
Divide the grain value by 3.086471671 to get carats.
When would you use grains vs carats?
The smallest common unit in the avoirdupois system, used in ballistics and medicine. Exactly 200 milligrams, the standard unit for gemstone and diamond weight.