Typically rings should be made to a standard size, however you will find that many ring size guides differ – how confusing!

At Ring Supplies our rings are made to the standard USA sizes, we then provide a guide as to the nearest UK size (There is not always an exact match).

We recommend using a ring sizer mandrel with both UK & USA sizes.

Below you will find a ring size guide which also shows the inside diameter of of our rings which should be used for a more accurate measurement.

US size Inside Diameter Approx UK size
3 14.0mm F
3.5 14.4mm G
4 14.8mm H
4.5 15.2mm I
5 15.6mm J 1/2
5.5 16.0mm K 1/2
6 16.5mm L 1/2
6.5 16.9mm M 1/2
6.75 17.1mm N
7 17.3mm O
7.5 17.7mm P
8 18.1mm Q
8.5 18.5mm R
9 18.9mm S
9.5 19.4mm S 3/4
10 19.8mm T 1/2
10.5 20.2mm U 1/2
11 20.6mm V 1/2
11.5 21.0mm W 1/2
12 21.4mm Y
12.5 21.8mm Z
13 22.2mm Z +1
13.5 22.6mm Z +2
14 23.0mm Z +3
14.5 23.4mm Z +4
15 23.8mm Z +5
15.5 24.2mm Z +6
16 24.6mm Z +7

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