Pennyweights to Carats

Bookmark Page Carats to Pennyweights (Swap Units)


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

Show formula

Convert Pennyweights to Carats

ct =
dwt * 7.7759
Show working
Show result in exponential format


A measure of Troy weight equalling 24 grains or the twentieth part of a Troy ounce (there are 12 ounces in a pound Troy). Pennyweight is usually abbreviated dwt.


Convert Pennyweights to Carats

ct =
dwt * 7.7759


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.


Pennyweights to Carats table
Print table
< Smaller Values Larger Values >
Pennyweights Carats
0dwt 0.00ct
1dwt 7.78ct
2dwt 15.55ct
3dwt 23.33ct
4dwt 31.10ct
5dwt 38.88ct
6dwt 46.66ct
7dwt 54.43ct
8dwt 62.21ct
9dwt 69.98ct
10dwt 77.76ct
11dwt 85.53ct
12dwt 93.31ct
13dwt 101.09ct
14dwt 108.86ct
15dwt 116.64ct
16dwt 124.41ct
17dwt 132.19ct
18dwt 139.97ct
19dwt 147.74ct
Pennyweights Carats
20dwt 155.52ct
21dwt 163.29ct
22dwt 171.07ct
23dwt 178.84ct
24dwt 186.62ct
25dwt 194.40ct
26dwt 202.17ct
27dwt 209.95ct
28dwt 217.72ct
29dwt 225.50ct
30dwt 233.28ct
31dwt 241.05ct
32dwt 248.83ct
33dwt 256.60ct
34dwt 264.38ct
35dwt 272.16ct
36dwt 279.93ct
37dwt 287.71ct
38dwt 295.48ct
39dwt 303.26ct
Pennyweights Carats
40dwt 311.03ct
41dwt 318.81ct
42dwt 326.59ct
43dwt 334.36ct
44dwt 342.14ct
45dwt 349.91ct
46dwt 357.69ct
47dwt 365.47ct
48dwt 373.24ct
49dwt 381.02ct
50dwt 388.79ct
51dwt 396.57ct
52dwt 404.35ct
53dwt 412.12ct
54dwt 419.90ct
55dwt 427.67ct
56dwt 435.45ct
57dwt 443.22ct
58dwt 451.00ct
59dwt 458.78ct
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