Ring Size Chart in Inches, MM and International Guide

In this guide, I will go over the different measurements of the best ring size. This circumference or diameter is usually shown in MM or inches. However, ring sizes have different designations that may vary by country. For example, think of USA, Canada, EU, UK, Australian and India sizes. So to simplify this I have collected all the information from experts and put it in these tables. In this way you can discover the ring size chart you need below! Furthermore, you will find out how to measure the ideal finger circumference.

Ring Size Chart with international dimensions

In this article we look at:

Ring size chart for US and Canada in Inches and MM
- Small size for kids
- Average ring size for men and women
- Big US ring measurement
EU ring sizes in MM and Inches
Asian ring dimensions chart (Japan, China, Hong Kong, Taiwan, Singapore, Macau)

Explore the different ring sizes to find the right circumference for you. Then we give tips to help you choose, because no person is the same.

US and Canada ring size in Inches and MM

First let’s look at the ring size chart for US and Canada from small to large. The smallest dimensions are better suited for babies and children.

Small ring size for kids and babies

Children’s rings usually measure from 0.5 to 5 inches. So, the diameter varies from 12 to 15 mm. That is ideal for a finger circumference of 37.8 to 48.7 mm.

US / Canada Ring size	Circumference in mm	Diameter in mm	Circumference in inches	Diameter in inches
0000	31.13 mm	9.91 mm	1.22 inch	0.39 inch
00	33.68 mm	10.72 mm	1.39 inch	0.44 inch
0	36.22 mm	11.53 mm	1.43 inch	0,45 inch
0.5	37.54 mm	11.95 mm	1.49 inch	0.47 inch
1	38.86 mm	12.37 mm	1.53 inch	0.49 inch
1.5	40.15 mm	12.78 mm	1.58 inch	0.50 inch
2	41.50 mm	13.21 mm	1.63 inch	0.52 inch
2.5	42.76 mm	13.61 mm	1.68 inch	0.54 inch
3	44.14 mm	14.05 mm	1.74 inch	0.55 inch
3.5	45.40 mm	14.45 mm	1.79 inch	0.57 inch
4	46.68 mm	14.86 mm	1.84 inch	0.59 inch
4.5	47.97 mm	15.27 mm	1.89 inch	0.60 inch
5	49.32 mm	15.70 mm	1.94 inch	0.62 inch

Choose the best ring size for childeren

US ring size 0000 to 0.5 is for babies. Is your child 1 to 3 years old? Then on average people choose US size 1 to 2. Furthermore, with the age of 3 to 6 years, the best size is around 2.5. Childeren in the age of 6 to 9 years mostly choose US size 3 to 3.5. Finally, ring size 4 or 5 are great for teens in the age of 8 to 14 years.

Average ring size for men and women

The average ring size for men is 8.5 US size. Therefore, it will not surprise you that the average women’s ring is size 6.5 in Canada and the United States.

US / Canada ring size	Circumference in mm	Diameter in mm	Circumference in inches	Diameter in inches
5.5	50.58 mm	16.10 mm	1.99 inch	0.63 inch
6	51.87 mm	16.51 mm	2.04 inch	0.65 inch
6.5	53.16 mm	16.92 mm	2.09 inch	0.66 inch
7	54.51 mm	17.35 mm	2.15 inch	0.68 inch
7.5	55.76 mm	17.75 mm	2.20 inch	0.69 inch
8	57.15 mm	18.19 mm	2.25 inch	0.71 inch
8.5	58.21 mm	18.53 mm	2.29 inch	0.73 inch
9	59.34 mm	18.89 mm	2.35 inch	0.75 inch
9.5	60.98 mm	19.41 mm	2.40 inch	0.76 inch
10	62.33 mm	19.84 mm	2.45 inch	0.78 inch
10.5	63.46 mm	20.20 mm	2.50 inch	0.79 inch
11	64.97 mm	20.68 mm	2.56 inch	0.81 inch
11.5	66.22 mm	21.08 mm	2.61 inch	0.83 inch
12	67.51 mm	21.49 mm	2.66 inch	0.85 inch
12.5	68.77 mm	21.89 mm	2.71 inch	0.86 inch
13	70.15 mm	22.33 mm	2.76 inch	0.88 inch

Big ring sizes in US and Canada

Last but not least, big ring sizes are also available. Usually this goes up to size 16 which has a circumference of 3.07 Inches and a diameter of 0.98 Inches.

US / Canada ring size	Circumference in mm	Diameter in mm	Circumference in inches	Diameter in inches
13.5	71.00 mm	22.60 mm	2.80 inch	0.89 inch
14	72.76 mm	23.16 mm	2.86 inch	0.91 inch
14.5	73.98 mm	23.55 mm	2.91 inch	0.93 inch
15	75.40 mm	24 mm	2.97 inch	0.94 inch
15.5	76.69 mm	24.41 mm	3.02 inch	0.96 inch
16	78 mm	24.83 mm	3.07 inch	0.98 inch

EU ring sizes circumference and diameter in MM

In Europe there are different countries with different size charts. You will find them below. Do you want the official ISO 8653:2016 standard? You can buy it through the link.

Complete EU size chart

EU ring size – France	Circumference in mm	Diameter in mm
37	37 mm	11,78 mm
38	38 mm	12,09 mm
38.5	38,5 mm	12,25 mm
39	39 mm	12,41 mm
40	40 mm	12,73 mm
41	41 mm	13,05 mm
42	42 mm	13,37 mm
42.5	42,41 mm	13,50 mm
43	43 mm	13,69 mm
44	44 mm	14,01 mm
45	45 mm	14,32 mm
46	46 mm	14,64 mm
47	47 mm	14,96 mm
48	48 mm	15,28 mm
49	49 mm	15,60 mm
50	50 mm	15,92 mm
51	51 mm	16,23 mm
52	52 mm	16,55 mm
52.5	52,46 mm	16,70 mm
53	53 mm	16,87 mm
54	54 mm	17,19 mm
55	55 mm	17,56 mm
56	56 mm	17,83 mm
57	57 mm	18,14 mm
57.5	57,50 mm	18,30 mm
58	58 mm	18,46 mm
59	59 mm	18,78 mm
60	60 mm	19,10 mm
61	61 mm	19,42 mm
62	62 mm	19,74 mm
63	63 mm	20,05 mm
64	64 mm	20,37 mm
65	65 mm	20,69 mm
66	66 mm	21,01 mm
67	67 mm	21,33 mm
67.5	67,50 mm	21,49 mm
68	68 mm	21,65 mm
69	69 mm	21,96 mm
70	70 mm	22,28 mm
71	71 mm	22,60 mm
72	72 mm	22,92 mm
73	73 mm	23,24 mm
74.5	74,5 mm	23,70 mm
75	75 mm	23,90 mm
76	76 mm	24,19 mm

EU – Swiss / German ring size chart

However, many countries also measure with the German dimensions. They are shown below to give you a complete picture.

Swiss / German ring size	Circumference in mm	Diameter in mm
12	37,80 mm	12 mm
12.5	39,30 mm	12,5 mm
13	40.84 mm	13 mm
13.5	42.41 mm	13,5 mm
14	43.98 mm	14 mm
14.5	45,55 mm	14,5 mm
15	47,12 mm	15 mm
15.5	48,69 mm	15,5 mm
16	50,27 mm	16 mm
16.5	51,87 mm	16,5 mm
17	53,41 mm	17 mm
17.5	54,98 mm	17,5 mm
18	56,55 mm	18 mm
18.5	58,12 mm	18,5 mm
19	59,69 mm	19 mm
19.5	61,26 mm	19,5 mm
20	62,83 mm	20 mm
20.5	64,40 mm	20,5 mm
21	65,97 mm	21 mm
21.5	67,51 mm	21,5 mm
22	69,12 mm	22 mm
22.5	70,69 mm	22,5 mm
23	72,26 mm	23 mm
23.5	73,83 mm	23,5 mm
24	75,40 mm	24 mm
24.5	77,00 mm	24,5 mm
25	78,54 mm	25 mm

Britain UK ring size chart

Britain ring size	Circumference in mm	Diameter in mm
A	37.80 mm	12.04 mm
B	39.10 mm	12.45 mm
C	40.40 mm	12.85 mm
D	41.70 mm	13.26 mm
E	42.90 mm	13.67 mm
F	44.20 mm	14.07 mm
G	45.50 mm	14.48 mm
H	46.80 mm	14.88 mm
I	48.00 mm	15.29 mm
J	48.70 mm	15.49 mm
K	50.00 mm	15.90 mm
L	51.20 mm	16.31 mm
M	52.50 mm	16.71 mm
N	53.80 mm	17.12 mm
O	55.10 mm	17.53 mm
P	56.30 mm	17.93 mm
Q	57.60 mm	18.34 mm
R	58.90 mm	18.75 mm
S	60.20 mm	19.15 mm
T	61.40 mm	19.56 mm
U	62.70 mm	19.96 mm
V	64.00 mm	20.37 mm
W	65.30 mm	20.78 mm
X	66.60 mm	21.18 mm
Y	67.80 mm	21.59 mm
Z	68.50 mm	21.79 mm

Asian ring dimensions chart (Japan, China, Hong Kong, Taiwan, Singapore, Macau)

Asian ring size Japan, China, Hong Kong, Taiwan, Singapore, Macau	Circumference in mm	Diameter in mm
0	37.80 mm	12.04 mm
1	40.84 mm	13 mm
2	41.88 mm	13.33 mm
3	42.91 mm	13.66 mm
4	43.98 mm	14 mm
5	45.02 mm	14.33 mm
6	46.06 mm	14.66 mm
7	47.12 mm	15 mm
8	48.16 mm	15.33 mm
9	49.20 mm	15.66 mm
10	50.27 mm	16 mm
11	51.30 mm	16.33 mm
12	52.34 mm	16.66 mm
13	53.41 mm	17 mm
14	54.44 mm	17.33 mm
15	55.48 mm	17.66 mm
16	56.55 mm	18 mm
17	57.59 mm	18.33 mm
18	58.62 mm	18.66 mm
19	59.69 mm	19 mm
20	60.73 mm	19.33 mm
21	61.76 mm	19.66 mm
22	62.83 mm	20 mm
23	63.87 mm	20.33 mm
24	64.91 mm	20.66 mm
25	65.97 mm	21 mm
26	67.01 mm	21.33 mm
27	68.05 mm	21.66 mm
28	69.12 mm	22 mm
29	70.15 mm	22.33 mm
30	71.19 mm	22.66 mm
31	72.26 mm	23 mm
32	73.29 mm	23.33 mm
33	74.33 mm	23.66 mm
34	75.40 mm	24 mm
35	76.43 mm	24.33 mm
36	77.47 mm	24.66 mm
37	78.54 mm	25 mm

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Furthermore, you can also read more about other jewelry sizing.