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.
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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
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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 Diameter Inside Circumference Sizes
inches mm inches mm US & Canada UK & Australia
0.390 9.91 1.23 31.2 0000 -
0.422 10.72 1.33 33.7 00 -
0.458 11.63 1.44 36.5 0 -
0.466 11.84 1.46 37.2 1/4 -
0.474 12.04 1.49 37.8 1/2 A
0.482 12.24 1.51 38.5 3/4 A 1/2
0.49 12.45 1.54 39.1 1 B
0.498 12.65 1.56 39.7 1 1/4 B 1/2
0.506 12.85 1.59 40.4 1 1/2 C
0.514 13.06 1.61 41.0 1 3/4 C 1/2
0.522 13.26 1.64 41.7 2 D
0.53 13.46 1.67 42.3 2 1/4 D 1/2
0.538 13.67 1.69 42.9 2 1/2 E
0.546 13.87 1.72 43.6 2 3/4 E 1/2
0.554 14.07 1.74 44.2 3 F
0.562 14.27 1.77 44.8 3 1/4 F 1/2
0.57 14.48 1.79 45.5 3 1/2 G
0.578 14.68 1.82 46.1 3 3/4 G 1/2
0.586 14.88 1.84 46.8 4 H
0.594 15.09 1.87 47.4 4 1/4 H 1/2
0.602 15.29 1.89 48.0 4 1/2 I
0.61 15.49 1.92 48.7 4 3/4 J
0.618 15.7 1.94 49.3 5 J 1/2
0.626 15.9 1.97 50.0 5 1/4 K
0.634 16.1 1.99 50.6 5 1/2 K 1/2
0.642 16.31 2.02 51.2 5 3/4 L
0.65 16.51 2.04 51.9 6 L 1/2
0.658 16.71 2.07 52.5 6 1/4 M
0.666 16.92 2.09 53.1 6 1/2 M 1/2
0.674 17.12 2.12 53.8 6 3/4 N
0.682 17.32 2.14 54.4 7 N 1/2
0.69 17.53 2.17 55.1 7 1/4 O
0.698 17.73 2.19 55.7 7 1/2 O 1/2
0.706 17.93 2.22 56.3 7 3/4 P
0.714 18.14 2.24 57.0 8 P 1/2
0.722 18.34 2.27 57.6 8 1/4 Q
0.73 18.54 2.29 58.3 8 1/2 Q 1/2
0.738 18.75 2.32 58.9 8 3/4 R
0.746 18.95 2.34 59.5 9 R 1/2
0.754 19.15 2.37 60.2 9 1/4 S
0.762 19.35 2.39 60.8 9 1/2 S 1/2
0.77 19.56 2.42 61.4 9 3/4 T
0.778 19.76 2.44 62.1 10 T 1/2
0.786 19.96 2.47 62.7 10 1/4 U
0.794 20.17 2.49 63.4 10 1/2 U 1/2
0.802 20.37 2.52 64.0 10 3/4 V
0.81 20.57 2.54 64.6 11 V 1/2
0.818 20.78 2.57 65.3 11 1/4 W
0.826 20.98 2.59 65.9 11 1/2 W 1/2
0.834 21.18 2.62 66.6 11 3/4 X
0.842 21.39 2.65 67.2 12 X 1/2
0.85 21.59 2.67 67.8 12 1/4 Y
0.858 21.79 2.7 68.5 12 1/2 Z
0.866 22 2.72 69.1 12 3/4 Z 1/2
0.874 22.2 2.75 69.7 13
0.882 22.4 2.77 70.4 13 1/4 Z1
0.89 22.61 2.8 71.0 13 1/2
0.898 22.81 2.82 71.7 13 3/4 Z2
0.906 23.01 2.85 72.3 14 Z3
0.914 23.22 2.87 72.9 14 1/4 -
0.922 23.42 2.9 73.6 14 1/2 Z4
0.93 23.62 2.92 74.2 14 3/4 -
0.938 23.83 2.95 74.8 15 -
0.946 24.03 2.97 75.5 15 1/4 -
0.954 24.23 3 76.1 15 1/2 -
0.962 24.43 3.02 76.8 15 3/4 -
0.97 24.64 3.05 77.4 16 -

 

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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