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International Conversion Chart For Ring Sizes

In order to help users in understanding Ring sizes and parameters used in different countries, we have pulled out this chart to assist you in doing so. The chart includes inner diameter as well as circumference of a ring in inches and millimetres.

The Ring sizes are measured using simple tools such as Ring sizer stick (or Ring Mandrel) and Ring finger sizer as shown in the images below.

The size parameters differ country wise as shown in the table below.

Conversion chart for ring sizes
Inside diameterInside circumferenceSizes
(in)(mm)(in)(mm)US,
Canada and
Mexico
UK,
Ireland,
Australia and
New Zealand
China,
Japan,
South America
IndiaItaly,
Spain,
Netherlands,
Switzerland
0.45811.631.4436.50    
0.46611.841.4637.2¼    
0.47412.041.4937.8½A   
0.48212.241.5138.5¾   
0.4912.451.5439.11B1  
0.49812.651.5639.7   
0.50612.851.5940.4C  0.5
0.51413.061.6141 11
0.52213.261.6441.72D221.75
0.5313.461.6742.3  2.25
0.53813.671.6942.9E333
0.54613.871.7243.6 43.5
0.55414.071.7444.23F4 4.25
0.56214.271.7744.8554.75
0.5714.481.7945.5G  5.5
0.57814.681.8246.1666
0.58614.881.8446.84H7 6.75
0.59415.091.8747.4 77.5
0.60215.291.8948I888
0.6115.491.9248.7J 98.75
0.61815.71.9449.359 9.25
0.62615.91.9750K 1010
0.63416.11.9950.610 10.5
0.64216.312.0251.2L 1111.25
0.6516.512.0451.96111211.75
0.65816.712.0752.5M12 12.5
0.66616.922.0953.1131313.25
0.67417.122.1253.8N  13.75
0.68217.322.1454.47141414.5
0.6917.532.1755.1O 1515
0.69817.732.1955.715 15.75
0.70617.932.2256.3P 1616.25
0.71418.142.24578161717
0.72218.342.2757.6Q  17.5
0.7318.542.2958.3171818.25
0.73818.752.3258.9R 1919
0.74618.952.3459.5918 19.5
0.75419.152.3760.2S 2020.25
0.76219.352.3960.8192120.75
0.7719.562.4261.4T  21.5
0.77819.762.4462.110202222
0.78619.962.4762.710¼U212322.75
0.79420.172.4963.410½22 23.25
0.80220.372.526410¾V 2424
0.8120.572.5464.611232524.75
0.81820.782.5765.311¼W  25.25
0.82620.982.5965.911½242626
0.83421.182.6266.611¾X  26.5
0.84221.392.6567.212252727.25
0.8521.592.6767.812¼Y 2827.75
0.85821.792.768.512½Z26 28.5
0.866222.7269.112¾ 2929
0.87422.22.7569.713 273029.75
0.88222.42.7770.413¼Z1  30.5
0.8922.612.87113½  3131
0.89822.812.8271.713¾Z2 3231.75
0.90623.012.8572.314Z3  32.25
0.91423.222.8772.914¼  3333
0.92223.422.973.614½Z4  33.5
0.9323.622.9274.214¾  3434.25
0.93823.832.9574.815  3534.75
0.94624.032.9775.515¼   35.5
0.95424.23376.115½  3636.25
0.96224.433.0276.815¾   36.75
0.9724.643.0577.416  3737.5

Learn more about the fascinating world of gems and gemology at JK

Ring sizes can be measured physically by a plastic or metal ring sizer, or by measuring the girth of a ring that already fits. There are also online measuring tools available, though they may not be as precise as checking for the size physically.

The circumference of the ring (inner circle) is the distance around it. It is calculated based on the formula, π × diameter (where π=3.14). For example, the Indian size 10 has a diameter 15.9 mm. Hence the circumference would be 3.14 x 15.9 = Approx. 50 mm.

The average ring size for women in India is around Size 13-14 and for men, it is between Size 16-18.

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Learn more about the fascinating world of gems and gemology at JK

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