International Ring Size Chart

International Ring Size Chart
InsideInsideInsideInsideNumber SizesWheat Sheaf  
DiameterDiameterCircumferenceCircumferenceUS/CanadaBritishJapaneseSwiss
(inches)(mm)(inches)(mm)StandardIrishEquivalentEquivalent
    

 

Australian  
     Equivalent  
0.45811.61.43836.50   
0.46611.81.46337.21/4   
0.47412.01.48837.81/2A  
0.48212.21.51338.43/4A 1/2  
0.49012.41.53939.11B1 
0.49812.61.56439.71 1/4B 1/2  
0.50612.91.58940.41 1/2C  
0.51413.11.61441.01 3/4C 1/2  
0.52213.31.63941.62D21.50
0.53013.51.66442.32 1/4D 1/2  
0.53813.71.68942.92 1/2E32.75
0.54613.91.71443.52 3/4E 1/2  
0.55414.11.74044.23F44.00
0.56214.31.76544.83 1/4F 1/255.25
0.57014.51.79045.53 1/2G  
0.57814.71.81546.13 3/4G 1/266.50
0.58614.91.84046.747 
0.59415.11.86547.44 1/4H 1/2 7.75
0.60215.31.89048.04 1/28 
0.61015.51.91548.74 3/4J 9.00
0.61815.71.94149.35J 1/29 
0.62615.91.96649.95 1/4K 10.00
0.63416.11.99150.65 1/2K 1/210 
0.64216.32.01651.25 3/4L 11.75
0.65016.52.04151.86L 1/21112.75
0.65816.72.06652.56 1/412 
0.66616.92.09153.16 1/2M 1/21314.00
0.67417.12.11653.86 3/4N  
0.68217.32.14154.47N 1/21415.25
0.69017.52.16755.07 1/4  
0.69817.72.19255.77 1/2O 1/21516.50
0.70617.92.21756.37 3/4  
0.71418.12.24256.98P 1/21617.75
0.72218.32.26757.68 1/4  
0.73018.52.29258.28 1/2Q 1/217 
0.73818.72.31758.98 3/4R 19
0.74618.92.34259.59R 1/218 
0.75419.22.36860.19 1/4S 20.25
0.76219.42.39360.89 1/2S 1/219 
0.77019.62.41861.49 3/4T 21.5
0.77819.82.44362.110T 1/220 
0.78620.02.46862.710 1/4U21 
0.79420.22.49363.310 1/2U 1/22222.75
0.80220.42.51864.010 3/4V  
0.81020.62.54364.611V 1/223 
0.81820.82.56965.211 1/4W 25
0.82621.02.59465.911 1/2W 1/224 
0.83421.22.61966.511 3/4X  
0.84221.42.64467.212X 1/22527.50
0.85021.62.66967.812 1/4  
0.85821.82.69468.412 1/2Z2628.75
0.86622.02.71969.112 3/4Z 1/2  
0.87422.22.74469.713 27 
0.88222.42.76970.313 1/4Z1  
0.89022.62.79571.013 1/2   
0.89822.82.82071.613 3/4Z2  
0.90623.02.84572.314Z3  
0.91423.22.87072.914 1/4   
0.92223.42.89573.514 1/2Z4  
0.93023.62.92074.214 3/4   
0.93823.82.94574.815   
0.94624.02.97075.415 1/4   
0.95424.22.99676.115 1/2   
0.96224.43.02176.715 3/4   
0.97024.63.04677.416