Free Stone Size Calculator
Stone Size Conversion Chart
Pearl Plate (PP) and Stone Size (SS)
Millimeter Range | Inch Range | Stones | |||||
---|---|---|---|---|---|---|---|
PP | SS | Low | High | Low | High | per Inch | |
1 | 000 | 0.800 | 0.900 | 0.0315 | 0.0354 | 29.88 | |
2 | 00 | 0.900 | 1.000 | 0.0354 | 0.0394 | 26.74 | |
3 | 0 | 1.000 | 1.100 | 0.0394 | 0.0433 | 24.19 | |
4 | 1 | 1.100 | 1.200 | 0.0433 | 0.0472 | 22.09 | |
5 | 2 | 1.200 | 1.300 | 0.0472 | 0.0512 | 20.32 | |
6 | 2 | 1.300 | 1.350 | 0.0512 | 0.0531 | 19.17 | |
7 | 3 | 1.350 | 1.400 | 0.0531 | 0.0551 | 18.47 | |
8 | 3 | 1.400 | 1.500 | 0.0551 | 0.0591 | 17.52 | |
9 | 4 | 1.500 | 1.600 | 0.0591 | 0.0630 | 16.39 | |
10 | 4 | 1.600 | 1.700 | 0.0630 | 0.0669 | 15.39 | |
11 | 5 | 1.700 | 1.800 | 0.0669 | 0.0709 | 14.51 | |
12 | 5 | 1.800 | 1.900 | 0.0709 | 0.0748 | 13.73 | |
13 | 6 | 1.900 | 2.000 | 0.0748 | 0.0787 | 13.03 | |
14 | 6 | 2.000 | 2.100 | 0.0787 | 0.0827 | 12.39 | |
15 | 7 | 2.100 | 2.200 | 0.0827 | 0.0866 | 11.81 | |
16 | 7 | 2.200 | 2.300 | 0.0866 | 0.0906 | 11.29 | |
17 | 8 | 2.300 | 2.400 | 0.0906 | 0.0945 | 10.81 | |
18 | 8 | 2.400 | 2.500 | 0.0945 | 0.0984 | 10.37 | |
19 | 9 | 2.500 | 2.600 | 0.0984 | 0.1024 | 9.96 | |
PP | SS | MM Range | Inch Range | SPI | |||
20 | 9 | 2.600 | 2.700 | 0.1024 | 0.1063 | 9.58 | |
21 | 10 | 2.700 | 2.800 | 0.1063 | 0.1102 | 9.24 | |
22 | 10 | 2.800 | 2.850 | 0.1102 | 0.1122 | 8.99 | |
23 | 11 | 2.850 | 3.000 | 0.1122 | 0.1181 | 8.68 | |
24 | 12 | 3.000 | 3.200 | 0.1181 | 0.1260 | 8.19 | |
25 | 13 | 3.200 | 3.300 | 0.1260 | 0.1299 | 7.82 | |
26 | 13 | 3.300 | 3.400 | 0.1299 | 0.1339 | 7.58 | |
27 | 14 | 3.400 | 3.500 | 0.1339 | 0.1378 | 7.36 | |
28 | 14 | 3.500 | 3.600 | 0.1378 | 0.1417 | 7.15 | |
29 | 15 | 3.600 | 3.700 | 0.1417 | 0.1457 | 6.96 | |
30 | 15 | 3.700 | 3.800 | 0.1457 | 0.1496 | 6.77 | |
31 | 16 | 3.800 | 4.000 | 0.1496 | 0.1575 | 6.51 | |
32 | 17 | 4.000 | 4.100 | 0.1575 | 0.1614 | 6.27 | |
33 | 17 | 4.100 | 4.200 | 0.1614 | 0.1654 | 6.12 | |
34 | 18 | 4.200 | 4.300 | 0.1654 | 0.1693 | 5.98 | |
35 | 18 | 4.300 | 4.400 | 0.1693 | 0.1732 | 5.84 | |
36 | 19 | 4.400 | 4.500 | 0.1732 | 0.1772 | 5.71 | |
37 | 19 | 4.500 | 4.600 | 0.1772 | 0.1811 | 5.58 | |
SS | MM Range | Inch Range | SPI | ||||
20 | 4.600 | 4.800 | 0.1811 | 0.1890 | 5.40 | ||
21 | 4.800 | 4.900 | 0.1890 | 0.1929 | 5.24 | ||
22 | 4.900 | 5.100 | 0.1929 | 0.2008 | 5.08 | ||
23 | 5.100 | 5.270 | 0.2008 | 0.2075 | 4.90 | ||
24 | 5.270 | 5.440 | 0.2075 | 0.2142 | 4.74 | ||
25 | 5.440 | 5.610 | 0.2142 | 0.2209 | 4.60 | ||
26 | 5.610 | 5.780 | 0.2209 | 0.2276 | 4.46 | ||
27 | 5.780 | 5.960 | 0.2276 | 0.2346 | 4.33 | ||
28 | 5.960 | 6.140 | 0.2346 | 0.2417 | 4.20 | ||
29 | 6.140 | 6.320 | 0.2417 | 0.2488 | 4.08 | ||
30 | 6.320 | 6.500 | 0.2488 | 0.2559 | 3.96 | ||
31 | 6.500 | 6.680 | 0.2559 | 0.2630 | 3.85 | ||
32 | 6.680 | 6.872 | 0.2630 | 0.2706 | 3.75 | ||
33 | 6.872 | 7.069 | 0.2706 | 0.2783 | 3.64 | ||
34 | 7.069 | 7.272 | 0.2783 | 0.2863 | 3.54 | ||
35 | 7.272 | 7.482 | 0.2863 | 0.2946 | 3.44 | ||
36 | 7.482 | 7.700 | 0.2946 | 0.3031 | 3.35 | ||
37 | 7.700 | 7.927 | 0.3031 | 0.3121 | 3.25 | ||
38 | 7.927 | 8.164 | 0.3121 | 0.3214 | 3.16 | ||
39 | 8.164 | 8.412 | 0.3214 | 0.3312 | 3.06 | ||
SS | MM Range | Inch Range | SPI | ||||
40 | 8.412 | 8.672 | 0.3312 | 0.3414 | 2.97 | ||
41 | 8.672 | 8.945 | 0.3414 | 0.3522 | 2.88 | ||
42 | 8.945 | 9.232 | 0.3522 | 0.3635 | 2.79 | ||
43 | 9.232 | 9.534 | 0.3635 | 0.3754 | 2.71 | ||
44 | 9.534 | 9.852 | 0.3754 | 0.3879 | 2.62 | ||
45 | 9.852 | 10.187 | 0.3879 | 0.4011 | 2.54 | ||
46 | 10.187 | 10.540 | 0.4011 | 0.4150 | 2.45 | ||
47 | 10.540 | 10.912 | 0.4150 | 0.4296 | 2.37 | ||
48 | 10.912 | 11.304 | 0.4296 | 0.4450 | 2.29 | ||
49 | 11.304 | 11.717 | 0.4450 | 0.4613 | 2.21 | ||
50 | 11.717 | 11.970 | 0.4613 | 0.4713 | 2.14 | ||
51 | 11.970 | 12.220 | 0.4713 | 0.4811 | 2.10 | ||
52 | 12.220 | 12.470 | 0.4811 | 0.4909 | 2.06 | ||
53 | 12.470 | 12.720 | 0.4909 | 0.5008 | 2.02 | ||
54 | 12.720 | 12.970 | 0.5008 | 0.5106 | 1.98 | ||
55 | 12.970 | 13.220 | 0.5106 | 0.5205 | 1.94 | ||
56 | 13.220 | 13.470 | 0.5205 | 0.5303 | 1.90 | ||
57 | 13.470 | 13.720 | 0.5303 | 0.5402 | 1.87 | ||
58 | 13.720 | 13.970 | 0.5402 | 0.5500 | 1.83 | ||
59 | 13.970 | 14.220 | 0.5500 | 0.5598 | 1.80 | ||
SS | MM Range | Inch Range | SPI | ||||
60 | 14.220 | 14.470 | 0.5598 | 0.5697 | 1.77 | ||
61 | 14.470 | 14.720 | 0.5697 | 0.5795 | 1.74 | ||
62 | 14.720 | 14.970 | 0.5795 | 0.5894 | 1.71 | ||
63 | 14.970 | 15.220 | 0.5894 | 0.5992 | 1.68 | ||
64 | 15.220 | 15.470 | 0.5992 | 0.6091 | 1.66 | ||
65 | 15.470 | 15.720 | 0.6091 | 0.6189 | 1.63 | ||
66 | 15.720 | 15.970 | 0.6189 | 0.6287 | 1.60 | ||
67 | 15.970 | 16.220 | 0.6287 | 0.6386 | 1.58 | ||
68 | 16.220 | 16.470 | 0.6386 | 0.6484 | 1.55 | ||
69 | 16.470 | 16.720 | 0.6484 | 0.6583 | 1.53 | ||
70 | 16.720 | 16.970 | 0.6583 | 0.6681 | 1.51 | ||
71 | 16.970 | 17.220 | 0.6681 | 0.6780 | 1.49 | ||
72 | 17.220 | 17.470 | 0.6780 | 0.6878 | 1.46 | ||
73 | 17.470 | 17.720 | 0.6878 | 0.6976 | 1.44 | ||
74 | 17.720 | 17.970 | 0.6976 | 0.7075 | 1.42 | ||
75 | 17.970 | 18.220 | 0.7075 | 0.7173 | 1.40 | ||
76 | 18.220 | 18.470 | 0.7173 | 0.7272 | 1.38 | ||
77 | 18.470 | 18.720 | 0.7272 | 0.7370 | 1.37 | ||
78 | 18.720 | 18.970 | 0.7370 | 0.7469 | 1.35 | ||
79 | 18.970 | 19.220 | 0.7469 | 0.7567 | 1.33 | ||
SS | MM Range | Inch Range | SPI | ||||
80 | 19.220 | 19.470 | 0.7567 | 0.7665 | 1.31 | ||
81 | 19.470 | 19.720 | 0.7665 | 0.7764 | 1.30 | ||
82 | 19.720 | 19.970 | 0.7764 | 0.7862 | 1.28 | ||
83 | 19.970 | 20.220 | 0.7862 | 0.7961 | 1.26 | ||
84 | 20.220 | 20.470 | 0.7961 | 0.8059 | 1.25 | ||
85 | 20.470 | 20.720 | 0.8059 | 0.8157 | 1.23 | ||
86 | 20.720 | 20.970 | 0.8157 | 0.8256 | 1.22 | ||
87 | 20.970 | 21.220 | 0.8256 | 0.8354 | 1.20 | ||
88 | 21.220 | 21.470 | 0.8354 | 0.8453 | 1.19 | ||
89 | 21.470 | 21.720 | 0.8453 | 0.8551 | 1.18 | ||
90 | 21.720 | 21.970 | 0.8551 | 0.8650 | 1.16 | ||
91 | 21.970 | 22.220 | 0.8650 | 0.8748 | 1.15 | ||
92 | 22.220 | 22.470 | 0.8748 | 0.8846 | 1.14 | ||
93 | 22.470 | 22.720 | 0.8846 | 0.8945 | 1.12 | ||
94 | 22.720 | 22.970 | 0.8945 | 0.9043 | 1.11 | ||
95 | 22.970 | 23.220 | 0.9043 | 0.9142 | 1.10 | ||
96 | 23.220 | 23.470 | 0.9142 | 0.9240 | 1.09 | ||
97 | 23.470 | 23.720 | 0.9240 | 0.9339 | 1.08 | ||
98 | 23.720 | 23.970 | 0.9339 | 0.9437 | 1.07 | ||
99 | 23.970 | 24.220 | 0.9437 | 0.9535 | 1.05 | ||
100 | 24.220 | 24.470 | 0.9535 | 0.9634 | 1.04 |