Determining ring sizes

Ring sizes

It is important to understand whether a ring shown here will fit your finger.

Ring sizes are shown in the description with three measurements, like this: size M/6¼ /16.8mm internal diameter

The the first letter code (M) is the size code used in Australia, UK, New Zealand, Ireland, South Africa. The second fractional number is the size code used in north America (USA, Canada, Mexico).  The third number is the internal diameter in mm.

Codes used internationally for ring sizes vary widely from country to country and there is a certain lack of agreement about standards. Although there are many examples of International Ring Size tables on the web, these vary considerably and cannot be used reliably. Consequently, if you do not know your Aust/UK or north American ring size then the  most reliable measurement is the internal circumference of the ring. Most, but not all, European countries use this value directly as their standard ring size. A table showing these various values is shown at the end of this section.

Perhaps the best option for determining your ring size is to have it measured by a local jeweller. But it is also possible to do it yourself.

Measuring Your Finger

Your ring should fit your finger comfortably; snug enough so that it will not fall off, but loose enough to slide over your knuckle. When determining the ring size you need it is the knuckle that needs to be measured.

Finger size changes depending on the time of day and the weather. For best results measure your finger size:

  1. At the end of the day and when your fingers are warm (Fingers are smaller in the early morning and when cold.)
  2. Measure finger size 3 to 4 times to eliminate an erroneous reading.

Avoid using string or paper to measure ring size as these materials can stretch or twist, yielding an inaccurate measurement.

The circumference is easier to measure than the diameter. A simple method is to wrap sticky tape (that doesn't stretch) around the knuckle of your finger such that the ends overlap. Then cut the tape to take it off your finger. Then roll the tape out flat and measure the distance between the cut ends. This is the circumference of your knuckle.


International ring sizes

Inside Diameter  Inside Circumference Sizes
mm Inches mm Inches UK, Australia, Ireland, S.Africa  USA, Canada, Mexico Europe (not all countries) China, Japan, S.America
9.91 0.39 31.13 1.22 - 0000 - -
10.72 0.442 33.68 1.39 - 00 - -
11.53 0.454 36.22 1.43 - 0 - -
11.95 0.474 37.54 1.49 A ½ - -
12.18 0.482 38.26 1.51 ¾ - -
12.37 0.487 38.86 1.53 B 1 - 1
12.6 0.496 39.58 1.56 - -
12.78 0.503 40.15 1.58 C - -
13 0.512 40.84 1.61 - -
13.21 0.52 41.5 1.63 D 2 41½ 2
13.41 0.528 42.13 1.66 - -
13.61 0.536 42.76 1.68 E 42¾ 3
13.83 0.544 43.45 1.71 - -
14.05 0.553 44.14 1.74 F 3 44 4
14.15 0.557 44.45 1.75 3⅛ - -
14.25 0.561 44.77 1.76 - -
14.36 0.565 45.11 1.77 G 3⅜ 45½ 5
14.45 0.569 45.4 1.79 - -
14.56 0.573 45.74 1.8 3⅝ - 6
14.65 0.577 46.02 1.81 H 46½ -
14.86 0.585 46.68 1.84 4 - 7
15.04 0.592 47.25 1.86 I 47¾ -
15.27 0.601 47.97 1.89 - 8
15.4 0.606 48.38 1.9 J 4⅝ 49 -
15.53 0.611 48.79 1.92 - -
15.7 0.618 49.32 1.94 5 - 9
15.8 0.622 49.64 1.95 K 5⅛ 50 -
15.9 0.626 49.95 1.97 - -
16 0.63 50.27 1.98 5⅜ - 10
16.1 0.634 50.58 1.99 L 51¾ -
16.3 0.642 51.21 2.02 - -
16.41 0.646 51.55 2.03 5⅞ - -
16.51 0.65 51.87 2.04 M 6 52¾ 12
16.71 0.658 52.5 2.07 - -
16.92 0.666 53.16 2.09 N 54 13
17.13 0.674 53.82 2.12 - -
17.35 0.683 54.51 2.15 O 7 55¼ 14
17.45 0.687 54.82 2.16 - -
17.75 0.699 55.76 2.2 P 56½ 15
17.97 0.707 56.45 2.22 - -
18.19 0.716 57.15 2.25 Q 8 57¾ 16
18.35 0.722 57.65 2.27 - -
18.53 0.729 58.21 2.29 - 17
18.61 0.733 58.47 2.3 R 8⅝ 59 -
18.69 0.736 58.72 2.31 - -
18.8 0.74 59.06 2.32 8⅞ - -
18.89 0.748 59.34 2.35 9 - 18
19.1 0.752 60 2.36 S 9⅛ 60¼ -
19.22 0.757 60.38 2.38 - -
19.31 0.76 60.66 2.39 9⅜ - -
19.41 0.764 60.98 2.4 - 19
19.51 0.768 61.29 2.41 T 9⅝ 61.5 -
19.62 0.772 61.64 2.43 - -
19.84 0.781 62.33 2.45 10 - 20
20.02 0.788 62.89 2.48 U 10¼ 62¾ 21
20.2 0.797 63.46 2.5 10½ - 22
20.32 0.8 63.84 2.51 V 10⅝ 63 -
20.44 0.805 64.21 2.53 10¾ - -
20.68 0.814 64.97 2.56 11 - 23
20.76 0.817 65.22 2.57 W 11⅛ 65 -
20.85 0.821 65.5 2.58 11¼ - -
20.94 0.824 65.78 2.59 11⅜ - -
21.08 0.83 66.22 2.61 11½ - 24
21.18 0.834 66.54 2.62 X 11⅝ 66¼ -
21.24 0.836 66.73 2.63 11¾ - -
21.3 0.839 66.92 2.64 11⅞ - -
21.49 0.846 67.51 2.66 Y 12 67½ 25
21.69 0.854 68.14 2.68 12¼ - -
21.89 0.862 68.77 2.71 Z 12½ 68¾ 26
22.1 0.87 69.43 2.73 Z +½ 12¾ - -
22.33 0.879 70.15 2.76 Z+1 13 - 27
22.6 0.89 71 2.8 Z+1½ 13½ - -
22.69 0.893 71.28 2.81 Z+2 - - -
22.92 0.902 72 2.83 Z+2.5 - - -
23.06 0.908 72.45 2.85 Z+3 - - -
23.24 0.915 73.01 2.87 Z+3½ - - -
23.47 0.924 73.73 2.9 Z+4 - - -
23.55 0.927 73.98 2.91 Z+4½ - - -
23.87 0.94 74.99 2.95 Z+5 - - -
24.27 0.956 76.25 3 Z+6 - - -