Rings

Ring size chart and converter

Ring sizes as inner diameter and circumference in mm with US and UK sizes – and you can measure your own ring at true size on screen.

Your size

Diameter, mm17.3

Circumference, mm (EU)54.3

US7

UKN½

Brand charts can differ by up to half a size.

How to measure

Wrap a thread or paper strip around the base of the finger, mark where it meets and measure the length – that is the circumference. Or measure the inner diameter of a ring you own. Measure in the evening when fingers are warm.

My size cardJURGITA

Enter measurements in the converter ("From measurements") and all your sizes collect here. The data stays in this browser.

On-screen sizer

Measure your ring at true size

1. Calibrate your screen

Hold a bank card to the screen and move the slider until the outline matches the card's width.

Card width

2. Lay your ring on the circle

Place your ring on the circle and resize until the pink line meets the ring's inner edge.

Diameter: 17 mm

Diameter17

Circumference53.4

US6.5

UKM½

Printable ring sizer (actual size)

Chart

Ring size chart and how to measure ring size

Diameter, mm	Circumference, mm	US	UK
14.1	44.3	3	F
14.5	45.6	3.5	G
14.9	46.8	4	H
15.3	48.1	4.5	I
15.7	49.3	5	J½
16.1	50.6	5.5	K½
16.5	51.8	6	L½
16.9	53.1	6.5	M½
17.3	54.3	7	N½
17.7	55.6	7.5	O½
18.1	56.9	8	P½
18.5	58.1	8.5	Q½
18.9	59.4	9	R½
19.4	60.9	9.5	S½
19.8	62.2	10	T½
20.2	63.5	10.5	U½
20.6	64.7	11	V½
21	66	11.5	W½
21.4	67.2	12	X½
21.8	68.5	12.5	Z
22.2	69.7	13	Z+1

A specific size

3 3.5 4 4.5 5 5.5 6 6.5 7 7.5 8 8.5 9 9.5 10 10.5 11 11.5 12 12.5 13

Questions and answers

Frequently asked

01What is a size 7 ring in mm?

A US 7 ring has an inner diameter of 17.3 mm and a circumference of 54.4 mm.

Charts

Ring size chart and converter

Measure your ring at true size

Ring size chart and how to measure ring size

Frequently asked

Other size charts

The Jurgita letter