Ring Size Converter

Use our free ring size converter to determine your ring size by circumference or diameter.

Please, follow the simple steps below to determine your ring size:

  1. Choose your preferred sizing method
  2. Move the slider until the selected object fits between the boxes (to help with proportions)
  3. Click on the "Next" button and then move the slider until the inside diameter of the ring fits exactly between the boxes
  4. Take a look at the fields below to see the results.
Online Ring Sizer | Ring Size Converter

Sizing Method:

Full-Size SD Card

Move the slider until the SD card (width:2.4cm) fits between the boxes
||

Credit Card

Move the slider until your credit card (width:8.56cm) fits between the boxes
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Ruler

Move the slider until 2cm on your ruler fits between the boxes
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Your Ring Size


Move the slider until the inside diameter of the ring fits exactly between the boxes
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Inside Diameter

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Inside Circumference

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Size

US & CA: ---

UK & AU: ---

Ring Size Conversion Chart

Inside DiameterInside CircumferenceSizes
inchesmminchesmmUS & CanadaUK & Australia
0.3909.911.2331.20000-
0.42210.721.3333.700-
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
0.4912.451.5439.11B
0.49812.651.5639.71 1/4B 1/2
0.50612.851.5940.41 1/2C
0.51413.061.6141.01 3/4C 1/2
0.52213.261.6441.72D
0.5313.461.6742.32 1/4D 1/2
0.53813.671.6942.92 1/2E
0.54613.871.7243.62 3/4E 1/2
0.55414.071.7444.23F
0.56214.271.7744.83 1/4F 1/2
0.5714.481.7945.53 1/2G
0.57814.681.8246.13 3/4G 1/2
0.58614.881.8446.84H
0.59415.091.8747.44 1/4H 1/2
0.60215.291.8948.04 1/2I
0.6115.491.9248.74 3/4J
0.61815.71.9449.35J 1/2
0.62615.91.9750.05 1/4K
0.63416.11.9950.65 1/2K 1/2
0.64216.312.0251.25 3/4L
0.6516.512.0451.96L 1/2
0.65816.712.0752.56 1/4M
0.66616.922.0953.16 1/2M 1/2
0.67417.122.1253.86 3/4N
0.68217.322.1454.47N 1/2
0.6917.532.1755.17 1/4O
0.69817.732.1955.77 1/2O 1/2
0.70617.932.2256.37 3/4P
0.71418.142.2457.08P 1/2
0.72218.342.2757.68 1/4Q
0.7318.542.2958.38 1/2Q 1/2
0.73818.752.3258.98 3/4R
0.74618.952.3459.59R 1/2
0.75419.152.3760.29 1/4S
0.76219.352.3960.89 1/2S 1/2
0.7719.562.4261.49 3/4T
0.77819.762.4462.110T 1/2
0.78619.962.4762.710 1/4U
0.79420.172.4963.410 1/2U 1/2
0.80220.372.5264.010 3/4V
0.8120.572.5464.611V 1/2
0.81820.782.5765.311 1/4W
0.82620.982.5965.911 1/2W 1/2
0.83421.182.6266.611 3/4X
0.84221.392.6567.212X 1/2
0.8521.592.6767.812 1/4Y
0.85821.792.768.512 1/2Z
0.866222.7269.112 3/4Z 1/2
0.87422.22.7569.713
0.88222.42.7770.413 1/4Z1
0.8922.612.871.013 1/2
0.89822.812.8271.713 3/4Z2
0.90623.012.8572.314Z3
0.91423.222.8772.914 1/4-
0.92223.422.973.614 1/2Z4
0.9323.622.9274.214 3/4-
0.93823.832.9574.815-
0.94624.032.9775.515 1/4-
0.95424.23376.115 1/2-
0.96224.433.0276.815 3/4-
0.9724.643.0577.416-

 

You may also like to try our Diamond Weight Calculator to determine the approximate weight of your diamond based on its dimensions.

 

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