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Ring Sizes & Measurement

How to measure your finger for a ring

Your ring should fit your finger comfortably; snug enough so that it will not fall off, but loose enough to slide over your knuckle.

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.

Alternatively, you can use a piece of string or a slim band of paper to measure your finger. Simply wrap the string or paper around your finger at the base, mark the point at which overlap begins, then lay your string or paper flat and measure with a ruler marked in millimeters(mm). This will give you the proper circumference of the inside of the ring.

UK Size US Size Inner Diameter Inner Circumference
    in mm in mm
A ½ 0.470 11.94 1.476 37.500
¾ 0.478 12.14 1.501 38.125
B 1 0.487 12.33 1.526 38.750
0.493 12.53 1.550 39.375
C 0.501 12.73 1.575 40.000
0.509 12.93 1.599 40.625
D 2 0.517 13.13 1.624 41.250
0.525 13.33 1.649 41.875
E 0.533 13.53 1.673 42.500
0.540 13.73 1.698 43.125
F 3 0.548 13.93 1.722 43.750
3⅛ 0.556 14.13 1.747 44.375
G 3⅜ 0.564 14.32 1.772 45.000
3⅝ 0.572 14.52 1.796 45.625
H 0.580 14.72 1.821 46.250
4 0.587 14.92 1.845 46.875
I 0.595 15.12 1.870 47.500
0.603 15.32 1.895 48.125
J 4⅝ 0.611 15.52 1.919 48.750
5 0.619 15.72 1.944 49.375
K 5⅛ 0.627 15.92 1.969 50.000
5⅜ 0.634 16.11 1.993 50.625
L 0.642 16.31 2.018 51.250
5⅞ 0.650 16.51 2.042 51.875
M 6 0.658 16.71 2.067 52.500
0.669 16.91 2.092 53.125
N 0.674 17.11 2.116 53.750
0.681 17.31 2.141 54.375
O 7 0.689 17.51 2.165 55.000
0.697 17.71 2.190 55.625
P 0.705 17.90 2.215 56.250
0.713 18.10 2.239 56.875
Q 8 0.721 18.30 2.264 57.500
0.728 18.50 2.288 58.125
R 8⅝ 0.736 18.70 2.313 58.750
8⅞ 0.744 18.90 2.338 59.375
S 9⅛ 0.752 19.10 2.362 60.000
9⅜ 0.760 19.30 2.387 60.625
T 9⅝ 0.768 19.50 2.411 61.250
10 0.775 19.70 2.436 61.875
U 10¼ 0.783 19.89 2.461 62.500
10½ 0.791 20.09 2.485 63.125
V 10⅝ 0.799 20.29 2.510 63.750
11 0.807 20.49 2.534 64.375
W 11⅛ 0.815 20.69 2.559 65.000
11⅜ 0.822 20.89 2.584 65.625
X 11⅝ 0.830 21.09 2.608 66.250
11⅞ 0.838 21.29 2.633 66.875
Y 12 0.846 21.49 2.657 67.500
-- 0.854 21.68 2.682 68.125
Z 12½ 0.862 21.88 2.707 68.750
12¾ 0.869 22.08 2.731 69.375
Z+1 -- 0.877 22.28 2.756 70.000
Z+2 -- 0.893 22.68 2.805 71.250
Z+3 -- 0.909 23.08 2.854 72.500
Z+4 -- 0.924 23.47 2.904 73.750
Z+5 -- 0.940 23.87 2.953 75.000
Z+6 -- 0.956 24.27 3.002 76.250
Z+7 -- 0.971 24.67 3.051 77.500
Z+8 -- 0.987 25.07 3.100 78.750

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