1. Cut a strip of paper or a piece of string. The paper should be no wider than 3/4" (2 cm) and at least 4" (10 cm) long.
2. Wrap the paper or string around the base of the finger to be sized. Make sure the measurement is snug, but not too tight.
3. Mark the string or paper where it completes the circle.
4. Take the length of the paper or string measurement. Measure from the beginning to the mark with a ruler or tape measure.
Find the measurement on the chart below to find the corresponding ring size.
US/Canada Ring sizes
Inner Diameter
Inner Diameter
Inner Circumference
Inner Circumference
British, Irish, Australian sizes
Japanese sizes
Swiss/Italy/ Spain/ Netherlands sizes
Standard
(inches)
(mm)
(inches)
(mm)
Equivalent
Equivalent
Equivalent
0
0.458
11.6
1.438
36.5
1/4
0.466
11.8
1.463
37.2
1/2
0.474
12.0
1.488
37.8
A
3/4
0.482
12.2
1.513
38.4
A 1/2
1
0.490
12.4
1.539
39.1
B
1
1 1/4
0.498
12.6
1.564
39.7
B 1/2
1 1/2
0.506
12.9
1.589
40.4
C
1 3/4
0.514
13.1
1.614
41.0
C 1/2
2
0.522
13.3
1.639
41.6
D
2
1.50
2 1/4
0.530
13.5
1.664
42.3
D 1/2
2 1/2
0.538
13.7
1.689
42.9
E
3
2.75
2 3/4
0.546
13.9
1.714
43.5
E 1/2
3
0.554
14.1
1.740
44.2
F
4
4.00
3 1/4
0.562
14.3
1.765
44.8
F 1/2
5
5.25
3 1/2
0.570
14.5
1.790
45.5
G
3 3/4
0.578
14.7
1.815
46.1
G 1/2
6
6.50
4
0.586
14.9
1.840
46.7
H
7
4 1/4
0.594
15.1
1.865
47.4
H 1/2
7.75
4 1/2
0.602
15.3
1.890
48.0
I
8
4 3/4
0.610
15.5
1.915
48.7
J
9.00
5
0.618
15.7
1.941
49.3
J 1/2
9
5 1/4
0.626
15.9
1.966
49.9
K
10.00
5 1/2
0.634
16.1
1.991
50.6
K 1/2
10
5 3/4
0.642
16.3
2.016
51.2
L
11.75
6
0.650
16.5
2.041
51.8
L 1/2
11
12.75
6 1/4
0.658
16.7
2.066
52.5
M
12
6 1/2
0.666
16.9
2.091
53.1
M 1/2
13
14.00
6 3/4
0.674
17.1
2.116
53.8
N
7
0.682
17.3
2.141
54.4
N 1/2
14
15.25
7 1/4
0.690
17.5
2.167
55.0
O
7 1/2
0.698
17.7
2.192
55.7
O 1/2
15
16.50
7 3/4
0.706
17.9
2.217
56.3
P
8
0.714
18.1
2.242
56.9
P 1/2
16
17.75
8 1/4
0.722
18.3
2.267
57.6
Q
8 1/2
0.730
18.5
2.292
58.2
Q 1/2
17
8 3/4
0.738
18.7
2.317
58.9
R
19
9
0.746
18.9
2.342
59.5
R 1/2
18
9 1/4
0.754
19.2
2.368
60.1
S
20.25
9 1/2
0.762
19.4
2.393
60.8
S 1/2
19
9 3/4
0.770
19.6
2.418
61.4
T
21.5
10
0.778
19.8
2.443
62.1
T 1/2
20
10 1/4
0.786
20.0
2.468
62.7
U
21
10 1/2
0.794
20.2
2.493
63.3
U 1/2
22
22.75
10 3/4
0.802
20.4
2.518
64.0
V
11
0.810
20.6
2.543
64.6
V 1/2
23
11 1/4
0.818
20.8
2.569
65.2
W
25
11 1/2
0.826
21.0
2.594
65.9
W 1/2
24
11 3/4
0.834
21.2
2.619
66.5
X
12
0.842
21.4
2.644
67.2
X 1/2
25
27.50
12 1/4
0.850
21.6
2.669
67.8
Y
12 1/2
0.858
21.8
2.694
68.4
Z
26
28.75
12 3/4
0.866
22.0
2.719
69.1
Z 1/2
13
0.874
22.2
2.744
69.7
27
13 1/4
0.882
22.4
2.769
70.3
Z1
13 1/2
0.890
22.6
2.795
71.0
13 3/4
0.898
22.8
2.820
71.6
Z2
14
0.906
23.0
2.845
72.3
Z3
14 1/4
0.914
23.2
2.870
72.9
14 1/2
0.922
23.4
2.895
73.5
Z4
14 3/4
0.930
23.6
2.920
74.2
15
0.938
23.8
2.945
74.8
Z5
15 1/4
0.946
24.0
2.970
75.4
15 1/2
0.954
24.2
2.996
76.1
15 3/4
0.962
24.4
3.021
76.7
Z6
16
0.970
24.6
3.046
77.4
Special notes: There are several systems for denoting the sizes of jewellery rings in use around the world: The ISO standard for ring sizes is ISO 8653:1986, which defines standard ring sizes in terms of the inner circumference of the ring measured in millimetres. - In the United States and Canada, ring sizes are specified using a numerical scale, with quarter and half sizes. An increase of a full size is an increase of 0.032 inch (0.8128 mm) in diameter, or roughly 1/10 inch (more precisely, 0.1005 in or 2.55 mm) in inside circumference. - In Ireland, the United Kingdom and Australia, ring sizes are specified using an alphabetical scale, with half sizes. - In India, Japan and China, ring sizes are specified using a numerical scale, that only has whole sizes, and does not have simple linear correlation with diameter or circumference. - In Austria, France, Germany, Belgium and Scandinavia, ring sizes are specified using actual internal circumference in mm (the same as the ISO standard). - In Italy, Spain, Netherlands, and Switzerland, ring sizes are specified as the circumference minus 40mm. A 50 in Germany will be a 10 in Switzerland.
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