While its not the end of the world if the ring you surprise your significant other (S.O.) with is too big or too small …… life is so much better for all involved if the size is right from the start – so here are a couple of helpful hits on how to get the sizing right while not blowing the surprise…… Pick a ring that your S.O. currently wears on the third finger of their left-hand (or whatever finger you wish to fit). If the engagement gods (birthday gods, anniversary gods, etc) are with you then your s.o. takes this ring off from time to time, which gives you the chance you need. While we are not all secret agents or part-time ninja, you need to determine your level of stealth to pull off one of the following capers:
Good Luck !
U.S. & Canadian | UK, Australian & Irish | German | Japanese | Swiss | Internal Diameter (mm) |
3 | F | 14 | 4 | 4 | 13.90 – 14.10 |
3 ¼ | F ½ | 14 ½ | 14.15 – 14.30 | ||
3 ½ | G | 14 ½ | 5 | 5 ¼ | 14.40 – 14.60 |
3 ¾ | G ½ | 14 ¾ | 6 | 6 ½ | 14.65 – 14.80 |
4 | H – H ½ | 15 | 7 | 14.85 – 15.05 | |
4 ¼ | I | 7 ¾ | 15.10 – 15.28 | ||
4 ½ | I ½ | 15 ¼ | 8 | 15.30 – 15.48 | |
4 ¾ | J | 9 | 15.50 – 15.66 | ||
5 | J ½ | 15 ¾ | 9 | 15.68 – 15.75 | |
5 ¼ | K | 10 | 15.80 – 15.95 | ||
5 ½ | K ½ | 16 | 10 | 16.10 – 16.20 | |
5 ¾ | L | 11 | 11 ¾ | 16.25 – 16.33 | |
6 | L ½ | 16 ½ | 12 | 12 ¾ | 16.45 – 16.60 |
6 ¼ | M | 16 ¾ | 16.70 – 16.80 | ||
6 ½ | M ½ | 17 | 13 | 14 | 16.90 – 17.00 |
6 ¾ | N | 17.10 – 17.20 | |||
7 | N ½ – O | 17 ¼ | 14 | 15 ¼ | 17.30 – 17.45 |
7 ¼ | O ½ | 17 ½ | 17.50 – 17.65 | ||
7 ½ | P | 17 ¾ | 15 | 16 ½ | 17.70 – 17.80 |
7 ¾ | P ½ | 17.90 – 18.00 | |||
8 | Q | 18 | 16 | 17 ¾ | 18.14 – 18.30 |
8 ¼ | Q ½ | 18 ¼ | 18.33 – 18.45 | ||
8 ½ | R | 18 ½ | 17 | 18.50 – 18.65 | |
8 ¾ | R ½ | 18 ¾ | 19 | 18.68 – 18.80 | |
9 | S | 19 | 18 | 18.85 – 19.00 | |
9 ¼ | S ½ | 19 ¼ | 20 ¼ | 19.15 – 19.28 | |
9 ½ | 19 ½ | 19 | 19.30 – 19.45 | ||
9 ¾ | T | 19 ¾ | 21 ½ | 19.50 – 19.65 | |
10 | T ½ | 20 | 20 | 19.75 – 19.90 | |
10 ¼ | U | 20 ¼ | 21 | 19.95 – 20.10 | |
10 ½ | U ½ | 20 ½ | 22 | 22 ¾ | 20.15 – 20.25 |
10 ¾ | V | 20.30 – 20.48 | |||
11 | V ½ | 20 ¾ | 23 | 20.60 – 20.73 | |
11 ¼ | W | 25 | 20.80 – 20.90 | ||
11 ½ | W ½ | 21 | 24 | 20.95 – 21.10 | |
11 ¾ | X – X ½ | 21.15 – 21.30 | |||
12 | Y | 21 ¼ | 25 | 27 ½ | 21.40 – 21.55 |