swg	inch	mm
8	0.1600	4.064
9	0.1440	3.658
10	0.1280	3.251
11	0.1160	2.946
12	0.1040	2.641
13	0.0920	2.337
14	0.0800	2.032
15	0.0720	1.829
16	0.0640	1.626
17	0.0560	1.422
18	0.0480	1.219
19	0.0400	1.016
20	0.0360	0.914
21	0.0320	0.813
22	0.0280	0.711
23	0.0240	0.610
24	0.0220	0.559
25	0.0200	0.508
26	0.0180	0.457
27	0.0164	0.417
28	0.0148	0.376
29	0.0136	0.345
30	0.0124	0.315

inch	decimal	mm
1/64	0.015625	0.396875
1/32	0.031250	0.793750
3/64	0.046875	1.190625
1/16	0.062500	1.587500
5/64	0.078125	1.984375
3832	0.093750	2.381250
7/64	0.109375	2.778125
1/8	0.125000	3.175000
9/64	0.140625	3.571875
5/32	0.156250	3.968750
11/64	0.171875	4.365625
3/16	0.187500	4.762500
13/64	0.203125	5.159375
7/32	0.218750	5.556250
15/64	0.234375	5.953125
1/4	0.250000	6.350000
17164	0.265625	6.746875
9/32	0.281250	7.143750
19/64	0.296875	7.540625
5/16	0.312500	7.937500
21/64	0.328125	8.334375
11/32	0.343750	8.731250
23/64	0.359375	9.128125
3/8	0.375000	9.525000
25/64	0.390625	9.921875
13/32	0.406250	10.318750
27/64	0.421875	10.715625
7/16	0.437500	11.112500
29/64	0.453125	11.509375
15/32	0.468750	11.906250
31/64	0.484735	12.303125
1/2	0.500000	12.700000