Ring Size Guide

What Is a Ring Size?

Ring size is a number that corresponds to the inner measurement of a ring. In the United States, sizes typically range from 3 to 13 in quarter-size increments.

A well-fitting ring should feel snug yet comfortable. It should slide over the knuckle with a bit of resistance and sit securely at the base of the finger without feeling tight. The goal is a fit that feels natural and stays in place during daily activities without constriction.

Ring Size Conversion Chart

View the chart below to see how US sizes map to finger circumference and convert to international sizes.

All Brilliant Earth rings are crafted in standard US sizes. Engagement rings, wedding bands, and fashion rings for both men and women all follow the same size format.

Inside Circumference		US, Canada, Mexico	India, China, Japan, South America, Turkey, Israel
IN	MM	US, Canada, Mexico	India, China, Japan, South America, Turkey, Israel
1.74	44.2	3	4
1.77	44.8	3.25	---
1.79	45.5	3.5	5
1.82	46.1	3.75	6
1.84	46.8	4	7
1.87	47.4	4.25	---
1.89	48	4.5	8
1.92	48.7	4.75	---
1.94	49.3	5	9
1.97	50	5.25	---
1.99	50.6	5.5	10
2.02	51.2	5.75	11
2.04	51.9	6	12
2.07	52.5	6.25	---
2.09	53.1	6.5	13
2.12	53.8	6.75	---
2.14	54.4	7	14
2.17	55.1	7.25	---
2.19	55.7	7.5	15
2.22	56.3	7.75	---
2.24	57	8	16
2.27	57.6	8.25	---
2.29	58.3	8.5	17
2.32	58.9	8.75	---
2.34	59.5	9	18
2.37	60.2	9.25	---
2.39	60.8	9.5	19
2.42	61.4	9.75	---
2.44	62.1	10	20
2.47	62.7	10.25	21
2.49	63.4	10.5	22
2.52	64	10.75	---
2.54	64.6	11	23
2.57	65.3	11.25	---
2.59	65.9	11.5	24
2.62	66.6	11.75	---
2.65	67.2	12	25
2.68	68.1	12.25	---
2.71	68.5	12.5	26
2.72	69.1	12.75	---
2.75	69.7	13	27

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What Is a Ring Size?

Ring Size Conversion Chart

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