International Ring Sizes How to find your ring size? If you'd like to measure your ring size yourself, here are 4 easy steps. 1. Wrap a thin strip of paper or string around the base of the finger that will wear the ring. 2. Mark the point at which the string or paper meets itself. 3. Use a ruler to measure the length of the string/paper from its tip to the mark you made. This is your finger's measurement. 4. Using the chart below, match the measurement to your ring size.   4   H 1/2 7 14.8 mm 46.5 mm 4 1/2   I 1/2 8 15.2 mm 48 mm 5   J 1/2 9 15.6 mm 49 mm 5 1/2   L 10 16 mm 50.5 mm 6   M 12 16.4 mm 52 mm 6 1/2   N 13 16.8 mm 53 mm 7   O 14 17.3 mm 54.5 mm 7 1/2   P 15 17.7 mm 55.5 mm 8   Q 16 18.1 mm 57 mm 8 1/2   Q 1/2 17 18.5 mm 58 mm 9   R 1/2 18 18.9 mm 59.5 mm 9 1/2   S 1/2 20 19.3 mm 61 mm 10   T 1/2 21 19.7 mm 62 mm 10 1/2   U 1/2 22 20.1 mm 63.5 mm 11   V 1/2 24 20.6 mm 64.5 mm 11 1/2   W 1/2 25 21 mm 66 mm 12   Y 26 21.4 mm 67.5 mm 12 1/2   Z 27 21.8 mm 68.5 mm 13   Z + 1 28 22.2 mm 70 mm 13 1/2   Z + 2 29 22.6 mm 71 mm 14   Z + 3 31 23 mm 72.5 mm 14 1/2   Z + 4 32 23.4 mm 74 mm 15   Z + 5 33 23.9 mm 75 mm