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Ring Size Test


Getting a ring that fits is just as important as picking the right ring, and GEMaffair.com has all the tools necessary to ensure you not only find the perfect piece of jewelry, but also that it will fit like a dream. You can use this detailed ring sizing guide to figure out your ring size, learn how rings are measured, and which rings can and cannot be altered.


Ring Size

A Ring Size is determined by measuring diameter of the interior of the ring. Generally measured in millimeters, the distance across the widest part corresponds to a standard size.

Ring size diagram

How is Ring Size Measured?

We try to evaluate each style before adding it to our extensive inventory. Not only do we choose pieces with quality craftsmanship and gemstones, but we also inspect each style for durability and - of course - for sizing. We always try and purchase styles that can be easily sized by our professional in-house jewelers to ensure you get the best ring with the best fit.

GEMaffair's Sizing Judgment

All rings are judged on an individual basis by one of GEMaffair.com's experienced craftsmen. The sizing statements made on our site are very conservative estimates, as we can not ensure - unless the work is done in-house by one of our professional jewelers - that the sizing process will be done correctly. If you have questions about sizing a specific ring on our website, please call us at 1-800-471-GEMS and an experienced jewelry concierge will be happy to assist you.

What is My Ring Size?

Not sure what your ring size is? Don't worry, we can help you determine your size both quickly an accurately. All you need is a printer, a pair of scissors, and a ruler. Print out the Ring Sizing Tool and you'll soon be on your way towards knowing which fingers are which sizes.


Ring Size Conversion Chart

The chart below outlines the different sizes,s their measurements, and their conversions. To read the chart, choose your US ring size and read the chart horizontally across to find out both the ring's corresponding size in other countries and it diameter (the widest distance across the ring's interior).


US Size Dia.in inch Dia. in MM British French German Japanese Swiss
0000 .390 9.91 - ? ? ? ?
00 .422 10.72 - ? ? ? ?
0 .454 11.53 - ? ? ? ?
1/2 .474 11.95 A ? ? ? ?
3/4 .482 12.18 A 1/2 ? ? ? ?
1 .487 12.37 B ? ? 1 ?
1 1/4 - 12.60 B 1/2 ? ? ? ?
1 1/2 .503 12.78 C ? ? ? ?
1 3/4 - 13.00 C 1/2 ? ? ? ?
2 .520 13.21 D 41 1/2 13 1/2 2 1 1/2
2 1/4 - 13.41 D 1/2 - - ? ?
2 1/2 .536 13.61 E 42 3/4 13 3/4 3 2 3/4
2 3/4 - 13.83 E 1/2 - - ? ?
3 .553 14.05 F 44 14 4 4
3 1/8 - 14.15 F 1/2 - - ? ?
3 1/4 - 14.25 - - - ? ?
3 3/8 - 14.36 G 45 1/4 - 5 5 1/4
3 1/2 .569 14.45 - - 14 1/2 ? ?
3 5/8 - 14.56 ?G 1/2 - ? 6 ?
3 3/4 - 14.65 H 46 1/2 ? ? 6 1/2
4 .585 14.86 H 1/2 - 15 7 ?
4 1/4 - 15.04 I? 47 3/4 ? ? 7 3/4
4 1/2 .601 15.27 I 1/2 - 15 1/4 8 ?
4 5/8 - 15.40 J 49 15 1/2 ? 9
4 3/4 - 15.53 - - ? ? ?
5 .618 15.70 J 1/2 - 15 3/4 9 ?
5 1/8 - 15.80 K 50 ? ? 10
5 1/4 - 15.90 - - ? ? ?
5 3/8 - 16.0 K 1/2 - ? 10 ?
5 1/2 .634 16.10 L 51 3/4 16 ? 11 3/4
5 3/4 - 16.30 - - ? ? ?
5 7/8 - 16.41 L 1/2 - ? ? ?
6 .650 16.51 M 52 3/4 16 1/2 12 12 3/4
6 1/4 - 16.71 M 1/2 - ? ? ?
6 1/2 .666 16.92 N 54 17 13 14
6 3/4 - 17.13 N 1/2 - ? ? ?
7 .683 17.35 O 55 1/4 17 1/4 14 15 1/4
7 1/4 - 17.45 O 1/2 - ? ? ?
7 1/2 .699 17.75 P 56 1/2 17 3/4 15 16 1/2
7 3/4 - 17.97 P 1/2 - ? ? ?
8 .716 18.19 Q 57 3/4 18 16 17 3/4
8 1/4 - 18.35 Q 1/2 - ? ? ?
8 1/2 .732 18.53 - - 18 1/2 17 ?
8 5/8 - 18.61 R 59 ? ? 19
8 3/4 - 18.69 - - ? ? ?
8 7/8 - 18.80 R 1/2 - ? ? ?
9 .748 18.89 - - 19 18 ?
9 1/8 - 19.10 S 60 1/4 ? ? 20 1/4
9 1/4 - 19.22 - - ? ? ?
9 3/8 - 19.31 S 1/2 - ? ? ?
9 1/2 .764 19.41 - - 19 1/2 19 ?
9 5/8 - 19.51 T 61 1/2 ? ? 21 1/2
9 3/4 - 19.62 - - ? ? ?
10 .781 19.84 T 1/2 - 20 20 ?
10 1/4 - 20.02 U 62 3/4 ? 21 22 3/4
10 1/2 .797 20.20 U 1/2 - 20 1/4 22 ?
10 5/8 - 20.32 V 63 ? ? 23 3/4
10 3/4 - 20.44 - - ? ? ?
11 .814 20.68 V 1/2 - 20 3/4 23 ?
11 1/8 - 20.76 W 65 ? ? 25
11 1/4 - 20.85 - - ? ? ?
11 3/8 - 20.94 W 1/2 - ? ? ?
11 1/2 - 21.08 - - 21 24 ?
11 5/8 .830 21.18 X 66 1/4 ? ? 26 1/4
11 3/4 - 21.24 - - ? ? ?
11 7/8 - 21.30 X 1/2 - ? ? ?
12 .846 21.49 Y 67 1/2 21 1/4 25 27 1/2
12 1/4 - 21.69 Y 1/2 - ? ? ?
12 1/2 .862 21.89 Z 68 3/4 21 3/4 26 28 3/4
12 3/4 - 22.10 Z 1/2 - ? ? ?
13 .879 22.33 - - 22 27 ?