Table of International Ring Size Equivalents

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This is a reference chart to check international ring sizes to the American standard size.

United States Standard (Including Canada)	Average Diameter In Inches	British Equivalent	French Equivalent	German Equivalent	Japanese Equivalent	Swiss Equivalent
000	.390	-	-	-	-	-
00	.422	-	-	-	-	-
0	.454	-	-	-	-	-
1/2	-	A	-	-	-	-
3/4	-	A1/22	-	-	-	-
1	.487	B	-	-	1	-
1 1/4	-	B-1/2	-	-	-	-
1 1/2	.503	C	-	-	-	-
1 3/4	-	C-1/2	-	-	-	-
2	.520	D	41 1/2	13 1/2	2	1 1/2
2 1/4	-	D-1/2	-	-	-	-
2 1/2	.536	E	42 3/4	13 3/4	3	2 3/4
2 3/4	-	E-1/2	-	-	-	-
3	.553	F	44	14	4	4
3 1/8	-	F-1/2	-	-	-	-
3 3/8	-	G	45 1/4	-	5	5 1/4
3 1/2	.569	-	-	14 1/2	-	-
3 5/8	-	G-1/2	-	-	6	-
3 3/4	-	H	46 1/2	-	-	6 1/2
4	.585	H-1/2	-	15	7	-
4 1/4	-	I	47 3/4	-	-	7 3/4
4 1/2	.601	I-1/2	-	15 1/4	8	-
4 7/8	-	J	49	-	-	9
5	.618	J-1/2	-	15 3/4	9	-
5 1/8	-	K	50	-	-	10
5 3/8	-	K-1/2	-	-	10	-
5 1/2	.634	L	51 3/4	16	-	11 3/4
5 7/8	-	L-1/2	-	-	11	-
6	.650	M	52 3/4	16 1/2	12	12 3/4
6 1/4	-	M-1/2	-	-	-	-
6 1/2	.666	N	54	17	13	14
6 3/4	-	N-1/2		-	-	-
7	.683	O	55 1/4	17 1/4	14	15 1/4
7 1/4	-	O-1/2	-	-	-	-
7 1/2	.699	P	56 1/2	17 3/4	15	16 1/2
7 3/4	-	P-1/2	-	-	-	-
8	.716	Q	57 3/4	18	16	17 3/4
8 1/4	-	Q-1/2	-	-	-	-
8 1/2	.732	-	-	18 1/2	17	-
8 5/8	-	R	59	-	-	19
8 7/8	-	R-1/2	-	-	-	-
9	.748	-	-	19	18	-
9 1/8	-	S	60 1/4	-	-	20 1/4
9 3/8	-	S-1/2	-	-	-	-
9 1/2	.764	-	-	19 1/2	19	-
9 5/8	-	T	61 1/2	-	-	21 1/2
10	.781	T-1/2	-	20	20	-
10 1/4	-	U	62 3/4	-	21	22 3/4
10 1/2	.797	U-1/2	-	20 1/4	22	-
10 5/8	-	V	63 3/4	-	-	23 3/4
11	.814	V-1/2	-	20 3/4	23	-
11 1/8	-	W	65	-	-	25
11 3/8	-	W-1/2	-	-	-	-
11 1/2	.830	-	-	21	24	-
11 5/8	-	X	66 1/4	-	-	26 1/4
11 7/8	-	X-1/2	-	-	-	-
12	.846	Y	67 1/2	21 1/4	25	27 1/2
12 1/4	-	Y-1/2	-	-	-	-
12 1/2	.862	Z	68 3/4	21 3/4	26	28 3/4
12 3/4	-	Z-1/2	-	-	-	-
13	.879	-	-	22	27	-

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Table of International Ring Size Equivalents

This is a reference chart to check international ring sizes to the American standard size.

United States Standard (Including Canada)

Average Diameter In Inches

British Equivalent

French Equivalent

German Equivalent

Japanese Equivalent

Swiss Equivalent

000

.390

00

.422

0

.454

1/2

A

3/4

A1/22

1

.487

B

1

1 1/4

B-1/2

1 1/2

.503

C

1 3/4

C-1/2

2

.520

D

41 1/2

13 1/2

2

1 1/2

2 1/4

D-1/2

2 1/2

.536

E

42 3/4

13 3/4

3

2 3/4

2 3/4

E-1/2

3

.553

F

44

14

4

4

3 1/8

F-1/2

3 3/8

G

45 1/4

5

5 1/4

3 1/2

.569

14 1/2

3 5/8

G-1/2

6

3 3/4

H

46 1/2

6 1/2

4

.585

H-1/2

15

7

4 1/4

I

United States Standard
(Including Canada)

Average Diameter
In Inches

British
Equivalent

French
Equivalent

German
Equivalent

Japanese
Equivalent

Swiss
Equivalent