Grains to Carats

Bookmark Page Carats to Grains (Swap Units)


Note: Fractional results are rounded to the nearest 1/64. For a more accurate answer please select 'decimal' from the options above the result.

Note: You can increase or decrease the accuracy of this answer by selecting the number of significant figures required from the options above the result.

Note: For a pure decimal result please select 'decimal' from the options above the result.

Show formula

Convert Grains to Carats

ct =
gr * 0.32399
Show working
Show result in exponential format


1/7000 pound; equals a troy grain or 64.799 milligrams


Convert Grains to Carats

ct =
gr * 0.32399


Abbreviated "ct." and spelled with a "c" is a measure of weight used for gemstones. One carat is equal to 1/5 of a gram (200 milligrams). Stones are measured to the nearest hundredth of a carat. A hundreth of a carat is also called a point. Thus a .10 carat stone can be called either 10 points, or 1/10 of a carat. Small stones like .05, and .10ct are most often referred to by point designations. Note that karat with a "K" is a measure of the purity of a gold alloy. A one carat round diamond of average proportions is approximately 6.5mm in diameter. Note that this relationship of weight and size is different for each family of stones. For example ruby and sapphire are both heavier than diamond (technically, they have a higher specific gravity, so a 1 carat ruby or sapphire is smaller in size than a on carat diamond. See Weights and Measures of Gold, Silver and Precious Gems for more information.


Grains to Carats table
Print table
< Smaller Values Larger Values >
Grains Carats
0gr 0.00ct
1gr 0.32ct
2gr 0.65ct
3gr 0.97ct
4gr 1.30ct
5gr 1.62ct
6gr 1.94ct
7gr 2.27ct
8gr 2.59ct
9gr 2.92ct
10gr 3.24ct
11gr 3.56ct
12gr 3.89ct
13gr 4.21ct
14gr 4.54ct
15gr 4.86ct
16gr 5.18ct
17gr 5.51ct
18gr 5.83ct
19gr 6.16ct
Grains Carats
20gr 6.48ct
21gr 6.80ct
22gr 7.13ct
23gr 7.45ct
24gr 7.78ct
25gr 8.10ct
26gr 8.42ct
27gr 8.75ct
28gr 9.07ct
29gr 9.40ct
30gr 9.72ct
31gr 10.04ct
32gr 10.37ct
33gr 10.69ct
34gr 11.02ct
35gr 11.34ct
36gr 11.66ct
37gr 11.99ct
38gr 12.31ct
39gr 12.64ct
Grains Carats
40gr 12.96ct
41gr 13.28ct
42gr 13.61ct
43gr 13.93ct
44gr 14.26ct
45gr 14.58ct
46gr 14.90ct
47gr 15.23ct
48gr 15.55ct
49gr 15.88ct
50gr 16.20ct
51gr 16.52ct
52gr 16.85ct
53gr 17.17ct
54gr 17.50ct
55gr 17.82ct
56gr 18.14ct
57gr 18.47ct
58gr 18.79ct
59gr 19.12ct
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