Ring Size Chart

Inside Diameter in Millimeters (mm)Ring Size Australia & UKRing Size Canada & USA
12.00A
12.20A.5
12.40B
12.65B.51
12.85C
13.00C.51.5
13.20D
13.40D.52
13.60E
13.80E.52.5
13.95F
14.15F.53
14.35G
14.55G.53.5
14.75H
14.95H.54
15.15I
15.35I.54.5
15.55J
15.75J.55
15.95K
16.15K.55.5
16.35L
16.55L.56
16.75M
16.95M.56.5
17.15N
17.35N.57
Inside Diameter in Millimeters (mm)Ring Size Australia & UKRing Size Canada & USA
17.55O
17.75O.57.5
17.95P
18.15P.58
18.35Q
18.55Q.58.5
18.70R
18.90R.5
19.05S9
19.25S.5
19.45T9.5
19.65T.5
19.85U10
20.05U.5
20.25V10.5
20.45V.5
20.65W11
20.85W.5
20.95X11.5
21.15X.5
21.35Y12
21.75Z12.5
22.15Z+1
22.45Z+2
22.75Z+3
23.15Z+4
23.55Z+5
24.55Z+6