Stones to Carats

Bookmark Page Carats to Stones (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 Stones to Carats

ct =
st * 31751
Show working
Show result in exponential format
More information: Stones


A stone is a unit of weight equal to 14 pounds averdupois (or international lbs). By turn, this makes a stone equivalent to 6.35029kg.


Convert Stones to Carats

ct =
st * 31751


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.


Stones to Carats table
Print table
< Smaller Values Larger Values >
Stones Carats
0st 0.00ct
1st 31751.47ct
2st 63502.93ct
3st 95254.40ct
4st 127005.87ct
5st 158757.33ct
6st 190508.80ct
7st 222260.27ct
8st 254011.73ct
9st 285763.20ct
10st 317514.67ct
11st 349266.13ct
12st 381017.60ct
13st 412769.07ct
14st 444520.54ct
15st 476272.00ct
16st 508023.47ct
17st 539774.94ct
18st 571526.40ct
19st 603277.87ct
Stones Carats
20st 635029.34ct
21st 666780.80ct
22st 698532.27ct
23st 730283.74ct
24st 762035.20ct
25st 793786.67ct
26st 825538.14ct
27st 857289.60ct
28st 889041.07ct
29st 920792.54ct
30st 952544.00ct
31st 984295.47ct
32st 1016046.94ct
33st 1047798.40ct
34st 1079549.87ct
35st 1111301.34ct
36st 1143052.80ct
37st 1174804.27ct
38st 1206555.74ct
39st 1238307.20ct
Stones Carats
40st 1270058.67ct
41st 1301810.14ct
42st 1333561.61ct
43st 1365313.07ct
44st 1397064.54ct
45st 1428816.01ct
46st 1460567.47ct
47st 1492318.94ct
48st 1524070.41ct
49st 1555821.87ct
50st 1587573.34ct
51st 1619324.81ct
52st 1651076.27ct
53st 1682827.74ct
54st 1714579.21ct
55st 1746330.67ct
56st 1778082.14ct
57st 1809833.61ct
58st 1841585.07ct
59st 1873336.54ct
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