Finding the right ring size ensures comfort and a perfect fit. Use the guide below to compare U.S. ring sizes with their corresponding inner diameter in millimeters. If you are between sizes, we recommend choosing the larger size for comfort.

Ring Sizes and Diameters:

• Size 7 → 17.51 mm
• Size 7 ½ → 17.59 mm
• Size 7 ¾ → 17.83 mm
• Size 8 → 18.15 mm
• Size 8 ½ → 18.47 mm
• Size 8 ¾ → 18.78 mm
• Size 9 → 19.10 mm
• Size 9 ½ → 19.42 mm
• Size 10 → 19.74 mm
• Size 10 ½ → 20.06 mm
• Size 10 ¾ → 20.38 mm
• Size 11 → 20.70 mm
• Size 11 ½ → 21.01 mm
• Size 12 → 21.33 mm
• Size 12 ½ → 21.65 mm
• Size 12 ¾ → 21.97 mm
• Size 13 → 22.29 mm