Your Universal Conversion Tool

US to UK Ring Size Conversion Calculator Tool

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Convert US ring sizes to UK sizes quickly and accurately using our free online tool.

Conversion Chart

US UK Diameter (mm) Circumference (mm)
3 F
3.5 G
4 H
4.5 I
5 J
5.5 K
6 L
6.5 M
7 N
7.5 O
8 P
8.5 Q
9 R
9.5 S
10 T
10.5 U
11 V
11.5 W
12 X
12.5 Y
13 Z