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Ring Sizes

US Ring Sizes

Simple Gold Ring

The origins of the US ring size standard are unknown but the standard has been in use since the 19th century, however it is unlikely that its use goes back much further than the mid 19th century as most rings were custom made prior to this date.

The standard uses a numerical scale from 0 to 16, with half and quarter sizes included. Each quarter size indicates an increase in diameter of eight thousandths of an inch (0.008 in) thus making the difference in full sizes 0.032in. This gives an increase of about a tenth of an inch in inner circumference of the ring per full size.

US Ring Size Measurements In Inches & Millimetres

SizeInner DiameterInner Circumference
 inmminmm
00.45811.631.43936.55
¼0.46611.841.46437.19
½0.47412.041.48937.82
¾0.48212.241.51438.46
10.49012.451.53939.09
0.49812.651.56539.75
0.50612.851.59040.39
0.51413.061.61541.02
20.52213.261.64041.66
0.53013.461.66542.29
0.53813.661.69042.92
0.54613.871.71543.56
30.55414.071.74044.20
0.56214.271.76644.86
0.57014.481.79145.49
0.57814.681.81646.13
40.58614.881.84146.76
0.59415.091.86647.40
0.60215.291.89148.03
0.61015.491.91648.67
50.61815.701.94249.33
0.62615.901.96749.96
0.63416.101.99250.60
0.64216.312.01751.23
60.65016.512.04251.87
0.65816.712.06752.50
0.66616.922.09253.14
0.67417.122.11753.77
70.68217.322.14354.43
0.69017.532.16855.07
0.69817.732.19355.70
0.70617.932.21856.34
80.71418.142.24356.97
SizeInner DiameterInner Circumference
 inmminmm
0.72218.342.26857.61
0.73018.542.29358.25
0.73818.752.31858.89
90.74618.952.34459.53
0.75419.152.36960.17
0.76219.352.39460.80
0.77019.562.41961.44
100.77819.762.44462.08
10¼0.78619.962.46962.72
10½0.79420.172.49463.36
10¾0.80220.372.52064.00
110.81020.572.54564.64
11¼0.81820.782.57065.27
11½0.82620.982.59565.91
11¾0.83421.182.62066.55
120.84221.392.64567.19
12¼0.85021.592.67067.83
12½0.85821.792.69568.47
12¾0.86622.002.72169.10
130.87422.202.74669.74
13¼0.88222.402.77170.38
13½0.89022.612.79671.02
13¾0.89822.812.82171.66
140.90623.012.84672.30
14¼0.91423.222.87172.93
14½0.92223.422.89773.57
14¾0.93023.622.92274.21
150.93823.832.94774.85
15¼0.94624.032.97275.49
15½0.95424.232.99776.18
15¾0.96224.433.02276.76
160.97024.643.04777.40
Stacking Rings

 

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