Ring Sizing Chart
Inside diameterInside circumferenceSizes
(in)(mm)(in)(mm)
ISO<
Cont.
EU		U.S.
Can.
Mex

U.K.,
Irl,
Autr,
S. Afr.
N. Z.

East Asia ,
S. America		IndiaItaly
Spain,
Nether.,
Switz.
0.45811.631.4436.50    
0.46611.841.4637.21/4    
0.47412.041.4937.81/2A   
0.48212.241.5138.53/4A+1⁄2   
0.4912.451.5439.11B1  
0.49812.651.5639.71+1⁄4B+1⁄2   
0.50612.851.5940.41+1⁄2C  0.4
0.51413.061.6141.01+3⁄4C+1⁄2 11
0.52213.261.6441.72D221.7
0.5313.461.6742.32+1⁄4D+1⁄2  2.3
0.53813.671.6942.92+1⁄2E332.9
0.54613.871.7243.62+3⁄4E+1⁄2 43.6
0.55414.071.7444.23F4 4.2
0.56214.271.7744.83+1⁄4F+1⁄2554.8
0.5714.481.7945.53+1⁄2G  5.5
0.57814.681.8246.13+3⁄4G+1⁄2666.1
0.58614.881.8446.84H7 6.8
0.59415.091.8747.44+1⁄4H+1⁄2 77.4
0.60215.291.8948.04+1⁄2I888
0.6115.491.9248.74+3⁄4J 98.7
0.61815.701.9449.35J+1⁄29 9.3
0.62615.901.9750.05+1⁄4K 1010
0.63416.101.9950.65+1⁄2K+1⁄210 10.6
0.64216.312.0251.25+3⁄4L 1111.2
0.6516.512.0451.96L+1⁄2111211.9
0.65816.712.0752.56+1⁄4M12 12.5
0.66616.922.0953.16+1⁄2M+1⁄2131313.1
0.67417.122.1253.86+3⁄4N  13.8
0.68217.322.1454.47N+1⁄2141414.4
0.6917.532.1755.17+1⁄4O 1515.1
0.69817.732.1955.77+1⁄2O+1⁄215 15.7
0.70617.932.2256.37+3⁄4P 1616.3
0.71418.142.2457.08P+1⁄2161717
0.72218.342.2757.68+1⁄4P+3⁄4  17.6
0.7318.542.2958.38+1⁄2Q+1⁄4171818.3
0.73818.752.3258.98+3⁄4R 1918.9
0.74618.952.3459.59R+1⁄218 19.5
0.75419.152.3760.29+1⁄4S 2020.2
0.76219.352.3960.89+1⁄2S+1⁄2192120.8
0.7719.562.4261.49+3⁄4T  21.4
0.77819.762.4462.110T+1⁄2202222.1
0.78619.962.4762.710+1⁄4U212322.7
0.79420.172.4963.410+1⁄2U+1⁄222 23.4
0.80220.372.5264.010+3⁄4V 2424
0.8120.572.5464.611V+1⁄2232524.6
0.81820.782.5765.311+1⁄4W  25.3
0.82620.982.5965.911+1⁄2W+1⁄2242625.9
0.83421.182.6266.611+3⁄4X  26.6
0.84221.392.6567.212X+1⁄2252727.2
0.8521.592.6767.812+1⁄4Y 2827.8
0.85821.792.7068.512+1⁄2Y+1⁄226 28.5
0.86622.002.7269.112+3⁄4Z 2929.1
0.87422.202.7569.713Z+1⁄2273029.7
0.88222.402.7770.413+1⁄4Z1  30.4
0.8922.612.8071.013+1⁄2  3131
0.89822.812.8271.713+3⁄4Z2 3231.7
0.90623.012.8572.314Z3  32.3
0.91423.222.8772.914+1⁄4  3332.9
0.92223.422.9073.614+1⁄2Z4  33.6
0.9323.622.9274.214+3⁄4  3434.2
0.93823.832.9574.815  3534.8
0.94624.032.9775.515+1⁄4   35.5
0.95424.233.0076.115+1⁄2  3636.1
0.96224.433.0276.815+3⁄4   36.8
0.9724.643.0577.416  3737.4