Ring Size Conversion Chart Submitted by Spyderbeak

FRACTION - DECIMAL - MILLIMETER
CONVERSION CHART
Use this table for quick conversions for mandrels and ring
size.
| Fraction |
Decimal |
MM |
|
1/64 |
.0156 |
.3969 |
| |
.019 |
.5 |
| 1/32 |
.0313 |
.07938 |
| |
.0394 |
1 |
| |
.059 |
1.5 |
| 1/16 |
.0625 |
1.5875 |
| |
.0787 |
2 |
| 3/32 |
.0938 |
2.3813 |
| |
.098 |
2.5 |
| |
.118 |
3 |
| 1/8 |
.125 |
3.175 |
| |
.137 |
3.5 |
| 5/32 |
.1563 |
3.9688 |
| |
.158 |
4 |
| |
.177 |
4.5 |
| 3/16 |
.1875 |
4.7625 |
| |
.197 |
5 |
| |
.216 |
5..5 |
| 7/32 |
.2188 |
5.5563 |
| |
.236 |
6 |
| 1/4 |
.25 |
6.35 |
| |
.255 |
6.5 |
| |
.276 |
7 |
| 9/32 |
.2813 |
7.1438 |
| |
.295 |
7.5 |
| 5/16 |
.3125 |
7.9375 |
| |
.315 |
8 |
| |
.334 |
8.5 |
| 11/32 |
.3438 |
8.7313 |
| |
.354 |
9 |
| |
.374 |
9.5 |
| 3/8 |
.375 |
9.525 |
| |
.394 |
10 |
| 13/32 |
.4063 |
10.3188 |
| |
.413 |
10.5 |
| |
.433 |
11 |
| 7/16 |
.4375 |
11.1125 |
| |
.452 |
11.5 |
| 15/32 |
.4688 |
11.9063 |
| |
.472 |
12 |
| |
.492 |
12.5 |
|
| Fraction |
Decimal |
MM |
| 1/2 |
.5 |
12.7 |
| |
.512 |
13 |
| 17/32 |
.5313 |
13.5 |
| |
.551 |
14 |
| 9/16 |
.5625 |
14.2875 |
| |
.57 |
14.5 |
| |
.591 |
15 |
| 19/32 |
.5938 |
15.0813 |
| |
.61 |
15.5 |
| |
.623 |
16 |
| 5/8 |
.625 |
|
| |
.649 |
16.5 |
| 21/32 |
.6563 |
16.6688 |
| |
.67 |
17 |
| 11/16 |
.6875 |
17.4625 |
| |
.689 |
17.5 |
| |
.709 |
18 |
| 23/32 |
.7188 |
18.2563 |
| |
.728 |
18.5 |
| |
.749 |
19 |
| 3/4 |
.75 |
19.05 |
| |
.767 |
19.5 |
| 25/32 |
.7813 |
19.8438 |
| |
.788 |
20 |
| |
.807 |
20.5 |
| 13/16 |
.8125 |
20.6375 |
| |
.8267 |
21 |
| 27/32 |
.8438 |
21.4313 |
| |
.8464 |
21.5 |
| |
.8661 |
22 |
| 7/8 |
.875 |
22.225 |
| |
.8858 |
22.5 |
| |
.9055 |
23 |
| 29/32 |
.9063 |
23.0188 |
| |
.925 |
23.5 |
| 15/16 |
.9375 |
23.8125 |
| |
.9448 |
24 |
| |
.9645 |
24.5 |
| 31/32 |
.9688 |
24.6063 |
| |
.9842 |
25 |
| 1 |
1 |
25.4 |
|
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