Information Technology Reference
In-Depth Information
My middle finger measures 19.3mm at the widest point. If a digital caliper is not
available, another way to measure a finger is to wrap a piece of paper around the
finger, mark where it overlaps, and use a ruler to find your finger's circumference.
Then consult the next chart to find out the standard ring size and diameter:
US
Standard
Ring Size
Circumference
(mm)
Circumference
(in)
Diameter (mm)
Radius (mm)
1.94
49.3
15.7
7.85
5
2.04
51.9
16.51
8.25
6
2.14
54.4
17.32
8.66
7
2.24
57
18.14
9.07
8
2.34
59.5
18.95
9.47
9
2.44
62.1
19.76
9.88
10
2.54
64.6
20.57
10.28
11
2.65
67.2
21.39
10.69
12
2.75
69.7
22.2
11.1
13
2.85
72.3
23.01
11.50
14
2.95
74.8
23.83
11.91
15
3.05
77.4
24.64
12.32
16
If all else fails, there is always trial and error. Make several test rings of various sizes,
print them out, then see which one fits best. An adult male generally has a size of
around
10
; an adult female around a size
8
, a child is around a size
5
. If the test rings
are made in the standard sizes and are marked, they could be kept for the future to
model rings for friends and family.
