- Ring Size Chart -

Ring Sizes A to Z – “Wheat Sheaf” System of Lettering (British Standard)

Inside Diameter (mm)Inside Circumference (mm)Ring Size (lettering)
12.037.8A
12.238.4A½
12.439.1B
12.639.7B½
12.840.4C
13.141.0C½
13.341.6D
13.542.3D½
13.742.9E
13.943.5E½
14.144.2F
14.344.8F½
14.545.5G
14.746.1G½
14.946.7H
15.147.4H½
15.348.0I
15.548.7J
15.749.3J½
15.949.9K
16.150.6K½
16.351.2L
16.551.8L½
16.752.5M
16.953.1M½
17.153.8N
17.354.4N½
17.555.0O
17.755.7O½
17.956.3P
18.156.9P½
18.357.6Q
18.558.2Q½
18.758.9R
18.959.5R½
19.260.1S
19.460.8S½
19.661.4T
19.862.1T½
20.062.7U
20.263.3U½
20.464.0V
20.664.6V½
20.865.2W
21.065.9W½
21.266.5X
21.467.2X½
21.667.8Y
21.868.4Z