Ring size

For the "ring gauge" used for cigars (1/64 inch), see Cigar.
A Bergeon ring sizing stick. (ISO 8653:1986 and number scales)

Ring size is a measurement used to denote the circumference of jewellery rings.

Systems

There are several systems for denoting the sizes of jewellery rings in use around the world:[1]

Equations

Conversion chart for ring sizes
Inside diameter Inside circumference Sizes
(in) (mm) (in) (mm) United States,
Canada and
Mexico
United Kingdom,
Ireland,
Australia and
New Zealand
China,
Japan,
South America
India Italy,
Spain,
Netherlands,
Switzerland
0.45811.631.4436.50
0.46611.841.4637.2¼
0.47412.041.4937.8½ A
0.48212.241.5138.5¾
0.49 12.451.5439.11 B 1
0.49812.651.5639.7
0.50612.851.5940.4C 0.5
0.51413.061.6141 1 1
0.52213.261.6441.72 D 2 2 1.75
0.53 13.461.6742.3 2.25
0.53813.671.6942.9E 3 3 3
0.54613.871.7243.6 4 3.5
0.55414.071.7444.23 F 4 4.25
0.56214.271.7744.85 5 4.75
0.57 14.481.7945.5G 5.5
0.57814.681.8246.16 6 6
0.58614.881.8446.84 H 7 6.75
0.59415.091.8747.4 7 7.5
0.60215.291.8948I 8 8 8
0.61 15.491.9248.7J 9 8.75
0.61815.71.9449.35 9 9.25
0.62615.91.9750K 1010
0.63416.11.9950.610 10.5
0.64216.312.0251.2L 1111.25
0.65 16.512.0451.96 111211.75
0.65816.712.0752.5M 12 12.5
0.66616.922.0953.1131313.25
0.67417.122.1253.8N 13.75
0.68217.322.1454.47 141414.5
0.69 17.532.1755.1O 1515
0.69817.732.1955.715 15.75
0.70617.932.2256.3P 1616.25
0.71418.142.24578 161717
0.72218.342.2757.6Q 17.5
0.73 18.542.2958.3171818.25
0.73818.752.3258.9R 1919
0.74618.952.3459.59 18 19.5
0.75419.152.3760.2S 2020.25
0.76219.352.3960.8192120.75
0.77 19.562.4261.4T 21.5
0.77819.762.4462.110202222
0.78619.962.4762.710¼U 212322.75
0.79420.172.4963.410½22 23.25
0.80220.372.526410¾V 2424
0.81 20.572.5464.611 232524.75
0.81820.782.5765.311¼W 25.25
0.82620.982.5965.911½242626
0.83421.182.6266.611¾X 26.5
0.84221.392.6567.212 252727.25
0.85 21.592.6767.812¼Y 2827.75
0.85821.792.768.512½Z 26 28.5
0.866222.7269.112¾ 2929
0.87422.22.7569.713 273029.75
0.88222.42.7770.413¼Z1 30.5
0.89 22.612.87113½ 3131
0.89822.812.8271.713¾Z2 3231.75
0.90623.012.8572.314 Z3 32.25
0.91423.222.8772.914¼ 3333
0.92223.422.973.614½Z4 33.5
0.93 23.622.9274.214¾ 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
0.97 24.643.0577.416 3737.5

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.

References

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