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 such string. This will be helpful for you to compare with the chart that is mentioned below.

Inside DiameterInside CircumferenceSIZE
MMMMUS / CanadaUK / Australia / South AfricaFrance / GermanyItalySpainJapan
14.144.23F4444.54
14.545.53.5G4655.55
14.946.84H47677
15.3484.5I48888
15.749.35J-½50109.59
16.150.65.5K-½511110.510
16.551.96L-½52121211
16.953.16.5M-½53131313
17.354.47N-½541514.514
17.755.77.5O-½56161615
18.1578P-½57171716
18.558.38.5Q-½581818.517
1959.59R-½592019.518
19.460.89.5S-½61212120
19.862.110T-½62222221
20.263.410.5U-½632423.522
20.664.611V-½642524.523
2165.911.5W-½66262625
21.467.212X-½672727.526
21.868.512.5Z682828.528
22.269.713Z+170303029
22.67113.5Z+1.571313130
2372.314Z+3723232.531
23.473.514.5Z+4733333.532
23.874.815Z+574353533

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.