RING
SIZE

CIRCUMFERENCE 
Inches / Millimeters

DIAMETER
Inches / Millimeters

0

1.44" / 36.5mm

0.46" / 11.6mm

1

1.54" / 39.1mm

0.49" / 12.4mm

2

1.64" / 41.6mm

0.52" / 13.3mm

3

1.74" / 44.2mm

0.55" / 14.1mm

4

1.84" / 46.7mm

0.59" / 14.9mm

5

1.94" / 49.3mm

0.62" / 15.7mm

6

2.04" / 51.8mm

0.65" / 16.5mm

7

2.14" / 54.4mm

0.68" / 17.3mm

8

2.24" / 56.9mm

0.71" / 18.1mm

9

2.34" / 59.5mm

0.75" / 18.9mm

10

2.44" / 62.1mm

0.78" / 19.8mm

11

2.54" / 64.6mm

0.81" / 20.6mm

12

2.64" / 67.2mm

0.84" / 21.4mm

13

2.74" / 69.7mm

0.87" / 22.2mm

14

2.85" / 72.3mm

0.91" / 23.0mm

15

2.95" / 74.8mm

0.94" / 23.8mm

16

3.05" / 77.4mm

0.97" / 24.6mm