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How to size a ring

Do you know your ring size? 

It's interesting to know that it's common that many people don't know their ring size when purchasing a ring. 

Well I am here to help. 

I generally recommend two ways to size your finger. 

  1. Measure the inside diameter of a ring you currently have against a ruler. 
  2. Find a piece of string wrap it around your finger and measure that against a rule

If you are planning to get a thicker ring regardless of what people might say it's best to stick to the measurements above and the jeweler will figure it out. 

Like a clothing size, there are different sizes for different regions. If you do know your size you can find your comparative size below. 

Alternatively, if you measure you finger size by either of the methods above you can compare you insider diameter size in the chart below.

For example, I have measured my index finger with a piece of sting and it was XX mm in length. This is your inside diameter. If I look at the chart below this means I would be between XX and XX size. 

Below is a table:

Inside Diameter Inside Circumfrance Sizes
MM Inches MM Inches UK & AU US & CA
14.05 0.553 44.14 1.74 F 3
14.15 0.557 44.45 1.75 F 1/2 3 1/8
14.36 0.565 45.11 1.77 G 3 3/8
14.56 0.573 45.74 1.8 G 1/2 3 5/8
14.65 0.577 46.02 1.81 H 3 3/4
14.86 0.585 46.68 1.84 H 1/2 4
15.04 0.592 47.25 1.86 I 4 1/4
15.27 0.601 47.97 1.89 I 1/2 4 1/2
15.4 0.606 48.38 1.9 J 4 5/8
15.7 0.618 49.32 1.94 J 1/2 5
15.8 0.622 49.64 1.95 K 5 1/8
16 0.63 50.27 1.98 K 1/2 5 3/8
16.1 0.634 50.58 1.99 L 5 1/2
16.41 0.646 51.55 2.03 L 1/2 5 7/8
16.51 0.65 51.87 2.04 M 6
16.71 0.658 52.5 2.07 M 1/2 6 1/4
16.92 0.666 53.16 2.09 N 6 1/2
17.13 0.674 53.82 2.12 N 1/2 6 3/4
17.35 0.683 54.51 2.15 O 7
17.45 0.687 54.82 2.16 O 1/2 7 1/4
17.75 0.699 55.76 2.2 P 7 1/2
17.97 0.707 56.45 2.22 P 1/2 7 3/4
18.19 0.716 57.15 2.25 Q 8
18.35 0.722 57.65 2.27 Q 1/2 8 1/4
18.61 0.733 58.47 2.3 R 8 5/8
18.8 0.74 59.06 2.32 R 1/2 8 7/8
19.1 0.752 60 2.36 S 9 1/8
19.31 0.76 60.66 2.39 S 1/2 9 3/8
19.51 0.768 61.29 2.41 T 9 5/8
19.84 0.781 62.33 2.45 T 1/2 10
20.02 0.788 62.89 2.48 U 10 1/4
20.2 0.797 63.46 2.5 U 1/2 10 1/2
20.32 0.8 63.84 2.51 V 10 5/8
20.68 0.814 64.97 2.56 V 1/2 11
20.76 0.817 65.22 2.57 W 11 1/8
20.94 0.824 65.78 2.59 W 1/2 11 3/8
21.18 0.834 66.54 2.62 X 11 5/8
21.3 0.839 66.92 2.64 X 1/2 11 7/8
21.49 0.846 67.51 2.66 Y 12
21.69 0.854 68.14 2.68 Y 1/2 12 1/4
21.89 0.862 68.77 2.71 Z 12 1/2
22.1 0.87 69.43 2.73 Z 1/2 12 3/4