International Ring Size Chart: Wedding & Engagement

Author: Ian C. Langtree - Writer/Editor for Disabled World (DW)
Published: 2019/12/19 - Updated: 2026/01/16
Publication Type: Informative
Category Topic: Calculators - Charts - Related Publications

Page Content: Synopsis - Introduction - Main - Insights, Updates

Synopsis: This information provides a practical reference tool that converts ring sizes across five international sizing systems - US/Canada, UK/Australia, Japan, and China - with exact measurements in both millimeters and inches for diameter and circumference. The chart proves particularly valuable for people with dexterity challenges, arthritis, or other conditions affecting hand mobility who need precise sizing information when purchasing rings online or internationally, as well as for seniors who may experience changes in finger size due to age-related swelling or medical conditions. The standardized measurement system helps eliminate guesswork when jewelers aren't readily accessible, and the printable format makes it easy to reference at home or share with family members who may be assisting with jewelry purchases - Disabled World (DW).

Introduction

Ring Sizing Information

Engagement and wedding rings are always sized on a universal standard scale so that sizes remain constant across jewelry stores in a particular country. These ring sizes are classed in millimeters - which is the measurement based on the inner circumference of the ring.

Main Content

Did You Know...

The United States and Canada use a numerical ring size scale which include half and quarter sizes. Some other countries use an alphabetical sizing scale.
To decrease the ring size a jeweler can make a small cut in the center of the ring and remove excess material until the band is the requested size.
A ring that doesn't quite fit can often be stretched to a maximum of half a size larger - if the required size exceeds this measurement extra metal will be soldered into the middle of the band.

Wedding Anniversary Names by Years Married : List of wedding anniversaries by year including names of materials, symbols and flowers associated with the time married anniversary.

Costume, Engagement and Wedding Ring Size Chart

Ring Size Conversions Table
US/Canada	UK/Australia	Japan	China	Diameter (inch)	Diameter (mm)	Circumference (inch)	Circumference (mm)
0	-	-	-	0.458	11.63	1.44	36.5
1/4	-	-	-	0.466	11.84	1.46	37.2
1/2	A	-	-	0.474	12.04	1.49	37.8
3/4	A 1/2	-	-	0.482	12.24	1.51	38.5
1	B	1	1	0.49	12.45	1.54	39.1
1 1/4	B 1/2	-	-	0.498	12.65	1.56	39.7
1 1/2	C	-	-	0.506	12.85	1.59	40.4
1 3/4	C 1/2	-	-	0.514	13.06	1.61	41.0
2	D	2	2	0.522	13.26	1.64	41.7
2 1/4	D 1/2	-	-	0.53	13.46	1.67	42.3
2 1/2	E	3	3	0.538	13.67	1.69	42.9
2 3/4	E 1/2	-	-	0.546	13.87	1.72	43.6
3	F	4	4	0.554	14.07	1.74	44.2
3 1/4	F 1/2	5	5	0.562	14.27	1.77	44.8
3 1/2	G	-	-	0.57	14.48	1.79	45.5
3 3/4	G 1/2	6	6	0.578	14.68	1.82	46.1
4	H	7	7	0.586	14.88	1.84	46.8
4 1/4	H 1/2	-	-	0.594	15.09	1.87	47.4
4 1/2	I	8	8	0.602	15.29	1.89	48.0
4 3/4	J	-	-	0.61	15.49	1.92	48.7
5	J 1/2	9	9	0.618	15.70	1.94	49.3
5 1/4	K	-	-	0.626	15.90	1.97	50.0
5 1/2	K 1/2	10	10	0.634	16.10	1.99	50.6
5 3/4	L	-	-	0.642	16.31	2.02	51.2
6	L 1/2	11	11	0.65	16.51	2.04	51.9
6 1/4	M	12	12	0.658	16.71	2.07	52.5
6 1/2	M 1/2	13	13	0.666	16.92	2.09	53.1
6 3/4	N	-	-	0.674	17.12	2.12	53.8
7	N 1/2	14	14	0.682	17.32	2.14	54.4
7 1/4	O	-	-	0.69	17.53	2.17	55.1
7 1/2	O 1/2	15	15	0.698	17.73	2.19	55.7
7 3/4	P	-	-	0.706	17.93	2.22	56.3
8	P 1/2	16	16	0.714	18.14	2.24	57.0
8 1/4	Q	-	-	0.722	18.34	2.27	57.6
8 1/2	Q 1/2	17	17	0.73	18.54	2.29	58.3
8 3/4	R	-	-	0.738	18.75	2.32	58.9
9	R 1/2	18	18	0.746	18.95	2.34	59.5
9 1/4	S	-	-	0.754	19.15	2.37	60.2
9 1/2	S 1/2	19	19	0.762	19.35	2.39	60.8
9 3/4	T	-	-	0.77	19.56	2.42	61.4
10	T 1/2	20	20	0.778	19.76	2.44	62.1
10 1/4	U	21	21	0.786	19.96	2.47	62.7
10 1/2	U 1/2	22	22	0.794	20.17	2.49	63.4
10 3/4	V	-	-	0.802	20.37	2.52	64.0
11	V 1/2	23	23	0.81	20.57	2.54	64.6
11 1/4	W	-	-	0.818	20.78	2.57	65.3
11 1/2	W 1/2	24	24	0.826	20.98	2.59	65.9
11 3/4	X	-	-	0.834	21.18	2.62	66.6
12	X 1/2	25	25	0.842	21.39	2.65	67.2
12 1/4	Y	-	-	0.85	21.59	2.67	67.8
12 1/2	Z	26	26	0.858	21.79	2.70	68.5
12 3/4	Z 1/2	-	-	0.866	22.00	2.72	69.1
13	-	27	27	0.874	22.20	2.75	69.7
13 1/4	Z1	-	-	0.882	22.40	2.77	70.4
13 1/2	-	-	-	0.89	22.61	2.80	71.0
13 3/4	Z2	-	-	0.898	22.81	2.82	71.7
14	Z3	-	-	0.906	23.01	2.85	72.3
14 1/4	-	-	-	0.914	23.22	2.87	72.9
14 1/2	Z4	-	-	0.922	23.42	2.90	73.6
14 3/4	-	-	-	0.93	23.62	2.92	74.2
15	-	-	-	0.938	23.83	2.95	74.8
15 1/4	-	-	-	0.946	24.03	2.97	75.5
15 1/2	-	-	-	0.954	24.23	3.00	76.1
15 3/4	-	-	-	0.962	24.43	3.02	76.8
16	-	-	-	0.97	24.64	3.05	77.4

Printable Ring Size Chart

Printable chart of international costume, engagement and wedding ring sizes.

*These charts are intended to aid people in finding an approximate international equivalent ring size. Disabled World takes no responsibility for any calculation errors.

Insights, Analysis, and Developments

Editorial Note: Finding the right ring size becomes more than just a matter of comfort when considering that many people with disabilities, arthritis, or circulatory conditions experience fluctuating finger sizes throughout the day or across seasons. This detailed conversion chart addresses a real accessibility gap in the jewelry industry, where physical try-ons may not always be feasible for those with mobility limitations or those living in remote areas. The inclusion of quarter-size increments in the US/Canada system and the cross-reference to multiple international standards reflects a thoughtful approach to precision that benefits anyone who has struggled with ill-fitting rings - whether due to hand differences, joint conditions, or simply the practical challenge of ordering jewelry sight unseen in our increasingly digital marketplace - Disabled World (DW).

Ian C. Langtree Author Credentials: Ian is the founder and Editor-in-Chief of Disabled World, a leading resource for news and information on disability issues. With a global perspective shaped by years of travel and lived experience, Ian is a committed proponent of the Social Model of Disability-a transformative framework developed by disabled activists in the 1970s that emphasizes dismantling societal barriers rather than focusing solely on individual impairments. His work reflects a deep commitment to disability rights, accessibility, and social inclusion. To learn more about Ian's background, expertise, and accomplishments, visit his full biography.