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So many sizes!  How do you know what is what.  Here is some help.  It is our handy Metric, English, and Gauge conversion chart.
Jewelry - Metric - English - Gauge Conversion Chart
Gauge

12
14
16
18
20
22
24
26
28
30
32
34
36
Inches

0.081
0.064
0.051
0.040
0.032
0.025
0.020
0.016
0.013
0.010
0.008
0.006
0.005
Millimeters(mm)

2.052
1.628
1.291
1.024
0.812
0.644
0.511
0.405
0.321
0.255
0.200
0.160
0.130
Inches

0.04
0.08
0.12
0.16
0.20
0.24
0.28
0.31
0.35
0.39
0.43
0.47
0.51
0.55
0.59
0.63
0.67
0.71
0.75
0.79
0.83
0.87
0.91
0.94
0.98
1.02
1.06
1.10
1.14
1.18
Millimeters(mm)

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
What size will my beads be???  We use a lot of metric sizes on our site.  Here is their English equivalent.