LIORÉNNA Jewelry Guide

Ring Size Chart: US, UK & EU Ring Size Conversion

Ring sizing can look confusing when different countries use different systems. Use our ring size chart to compare US, UK and European sizes alongside inside diameter and finger circumference measurements.

US · UK · EU · Diameter · Circumference

US UK and EU ring size chart and conversion guide

Quick Answer

How Ring Size Conversion Works

Ring sizes are labeled differently around the world. The US uses numerical sizes, the UK commonly uses letters, while European sizing is generally based on the ring's inner circumference in millimeters.

The easiest way to convert your size: find the size you already know in the chart below, then read across the same row to find the corresponding US, UK and EU sizes.

Ring Size Conversion

US, UK & EU Ring Size Chart

Compare common ring sizes using the conversion chart below. Diameter refers to the inside width of the ring, while circumference refers to the measurement around the inside of the ring.

US Size	UK Size	EU Size	Inside Diameter	Circumference
4	H½	47	14.9 mm	46.8 mm
4.5	I½	48	15.3 mm	48.0 mm
5	J½	49	15.7 mm	49.3 mm
5.5	K½	51	16.1 mm	50.6 mm
6	L½	52	16.5 mm	51.9 mm
6.5	M½	53	16.9 mm	53.1 mm
7	N½	54	17.3 mm	54.4 mm
7.5	O½	56	17.7 mm	55.7 mm
8	P½	57	18.1 mm	57.0 mm
8.5	Q½	58	18.5 mm	58.3 mm
9	R½	60	18.9 mm	59.5 mm
9.5	S½	61	19.4 mm	60.8 mm
10	T½	62	19.8 mm	62.1 mm
10.5	U½	63	20.2 mm	63.4 mm
11	V½	65	20.6 mm	64.6 mm
11.5	W½	66	21.0 mm	65.9 mm
12	X½	67	21.4 mm	67.2 mm
12.5	Z	68	21.8 mm	68.5 mm
13	Z+1	70	22.2 mm	69.7 mm

Ring sizing standards can vary slightly between manufacturers. If you fall between two sizes, check the individual product's sizing information before ordering.

Ring inside diameter and circumference measurement

Understanding the Chart

Ring Diameter vs Circumference

Diameter and circumference are two different measurements that can both help you determine your ring size.

Inside Diameter The straight-line distance across the inside of an existing ring, measured through the center.

Finger Circumference The distance around your finger where the ring will sit.

Find Your Size

Don't Know Your Ring Size Yet?

If you don't already know your ring size, you can measure either a ring that fits you well or your finger before using the conversion chart.

01 Measure

Measure the inside diameter of a ring or the circumference of your finger.

02 Compare

Find the closest measurement in the ring size chart above.

03 Convert

Read across the row to find the equivalent US, UK or EU size.

Read our complete guide to measuring your ring size →

Ring Size FAQ

Ring Size Conversion Questions

Are US and UK ring sizes the same?

No. US ring sizes are typically represented by numbers, while UK ring sizes commonly use letters. Use a conversion chart to compare equivalent sizes.

How do I convert my ring size to EU sizing?

Find your known US or UK size in the chart and read across to the EU column. European sizing is closely related to the ring's inner circumference in millimeters.

What if my measurement falls between two ring sizes?

If your measurement falls between available sizes, the best choice can depend on the ring style and width. Wider bands can feel tighter, while slim bands may feel more forgiving.

Is ring diameter the same as ring size?

No. Inside diameter is a physical measurement in millimeters. Ring size is the sizing label that corresponds to that measurement within a particular sizing system.

Can ring sizes vary between jewelry brands?

Small differences can occur between manufacturers and ring designs, so always check product-specific sizing information when available.

Jewelry Sizing