
This is a chart that will be extremely helpful for you to determine the ring size that you need. You can either make use of a tape or a small piece of string to measure the area that will be occupied by the ring. When it becomes a complete circle, make a mark on the string. This will be helpful for you to compare with the chart that is mentioned below.
|  Ring Size | 
Inside Circumference, mm | 
| 4 | 
46.8 | 
| 4.5 | 
48 | 
| 5 | 
49.3 | 
| 5.5 | 
50.6 | 
| 6 | 
51.9 | 
| 6.5 | 
53.1 | 
| 7 | 
54.4 | 
| 7.5 | 
55.7 | 
| 8 | 
57 | 
| 8.5 | 
58.3 | 
| 9 | 
59.5 | 
| 9.5 | 
60.8 | 
| 10 | 
62.1 | 
| 10.5 | 
63.4 | 
| 11 | 
64.6 | 
OTHER TIPS
1) *Measure your finger in warm temperatures at the end of the day.
2) *If your knuckle is a lot larger than the base of your finger, measure both the base of your finger and your knuckle and select a size between the two.
3) *When considering a wide band, move up a size from your measurement, for comfort’s sake.