Take the string or paper and cut it into a strip that is about 4-6 inches (10-15 cm) long.
Wrap the string or paper around the base of the finger you want to measure. Make sure it’s snug but not too tight. You should be able to slide it on and off comfortably.
When the string is comfortably wrapped around your finger, use a pen or marker to mark the point where the end of the string overlaps.
Carefully remove the string from your finger and lay it flat on a ruler or a tape measure. Measure the length from the end of the string to the marked point in millimeters/inches
Use the measurement you obtained to determine your ring size. You can use online ring size charts or consult with your local jeweller’s sizing guide to find the corresponding size.
| Inside Diameter | Inside Circumference | Sizes | |||||||
|---|---|---|---|---|---|---|---|---|---|
| MM | Inches | MM | Inches | British & Australian | US & Canada | French & Russian | German | Japanese | Swiss |
| 9.91 | 0.390 | 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 | 1/2 | – | – | – | – |
| 12.18 | 0.482 | 38.26 | 1.51 | A 1/2 | 3/4 | – | – | – | – |
| 12.37 | 0.487 | 38.86 | 1.53 | B | 1 | – | – | 1 | – |
| 12.60 | 0.496 | 39.58 | 1.56 | B 1/2 | 1 1/4 | – | – | – | – |
| 12.78 | 0.503 | 40.15 | 1.58 | C | 1 1/2 | – | – | – | – |
| 13.00 | 0.512 | 40.84 | 1.61 | C 1/2 | 1 3/4 | – | – | – | – |
| 13.21 | 0.520 | 41.50 | 1.63 | D | 2 | 41 1/2 | 13 1/2 | 2 | 1 1/2 |
| 13.41 | 0.528 | 42.13 | 1.66 | D 1/2 | 2 1/4 | – | – | – | – |
| 13.61 | 0.536 | 42.76 | 1.68 | E | 2 1/2 | 42 3/4 | 13 3/4 | 3 | 2 3/4 |
| 13.83 | 0.544 | 43.45 | 1.71 | E 1/2 | 2 3/4 | – | – | – | – |
| 14.05 | 0.553 | 44.14 | 1.74 | F | 3 | 44 | 14 | 4 | 4 |
| 14.15 | 0.557 | 44.45 | 1.75 | F 1/2 | 3 1/8 | – | – | – | – |
| 14.25 | 0.561 | 44.77 | 1.76 | F 3/4 | 3 1/4 | – | – | – | – |
| 14.36 | 0.565 | 45.11 | 1.77 | G | 3 3/8 | 45 1/4 | – | 5 | 5 1/4 |
| 14.45 | 0.569 | 45.40 | 1.79 | G 1/4 | 3 1/2 | – | 14 1/2 | – | – |
| 14.56 | 0.573 | 45.74 | 1.80 | G 1/2 | 3 5/8 | – | – | 6 | – |
| 14.65 | 0.577 | 46.02 | 1.81 | H | 3 3/4 | 46 1/2 | – | – | 6 1/2 |
| 14.86 | 0.585 | 46.68 | 1.84 | H 1/2 | 4 | – | 15 | 7 | – |
| 15.04 | 0.592 | 47.25 | 1.86 | I | 4 1/4 | 47 3/4 | – | – | 7 3/4 |
| 15.27 | 0.601 | 47.97 | 1.89 | I 1/2 | 4 1/2 | – | 15 1/4 | 8 | – |
| 15.40 | 0.606 | 48.38 | 1.90 | J | 4 5/8 | 49 | 15 1/2 | – | 9 |
| 15.53 | 0.611 | 48.79 | 1.92 | J 1/4 | 4 3/4 | – | – | – | – |
| 15.70 | 0.618 | 49.32 | 1.94 | J 1/2 | 5 | – | 15 3/4 | 9 | – |
| 15.80 | 0.622 | 49.64 | 1.95 | K | 5 1/8 | 50 | – | – | 10 |
| 15.90 | 0.626 | 49.95 | 1.97 | K 1/4 | 5 1/4 | – | – | – | – |
| 16.00 | 0.630 | 50.27 | 1.98 | K 1/2 | 5 3/8 | – | – | 10 | – |
| 16.10 | 0.634 | 50.58 | 1.99 | L | 5 1/2 | 51 3/4 | 16 | – | 11 3/4 |
| 16.30 | 0.642 | 51.21 | 2.02 | L 1/4 | 5 3/4 | – | – | – | – |
| 16.41 | 0.646 | 51.55 | 2.03 | L 1/2 | 5 7/8 | – | – | – | – |
| 16.51 | 0.650 | 51.87 | 2.04 | M | 6 | 52 3/4 | 16 1/2 | 12 | 12 3/4 |
| 16.71 | 0.658 | 52.50 | 2.07 | M 1/2 | 6 1/4 | – | – | – | – |
| 16.92 | 0.666 | 53.16 | 2.09 | N | 6 1/2 | 54 | 17 | 13 | 14 |
| 17.13 | 0.674 | 53.82 | 2.12 | N 1/2 | 6 3/4 | – | – | – | – |
| 17.35 | 0.683 | 54.51 | 2.15 | O | 7 | 55 1/4 | 17 1/4 | 14 | 15 1/4 |
| 17.45 | 0.687 | 54.82 | 2.16 | O 1/2 | 7 1/4 | – | – | – | – |
| 17.75 | 0.699 | 55.76 | 2.20 | P | 7 1/2 | 56 1/2 | 17 3/4 | 15 | 16 1/2 |
| 17.97 | 0.707 | 56.45 | 2.22 | P 1/2 | 7 3/4 | – | – | – | – |
| 18.19 | 0.716 | 57.15 | 2.25 | Q | 8 | 57 3/4 | 18 | 16 | 17 3/4 |
| 18.35 | 0.722 | 57.65 | 2.27 | Q 1/2 | 8 1/4 | – | – | – | – |
| 18.53 | 0.729 | 58.21 | 2.29 | Q 3/4 | 8 1/2 | – | 18 1/2 | 17 | – |
| 18.61 | 0.733 | 58.47 | 2.30 | R | 8 5/8 | 59 | – | – | 19 |
| 18.69 | 0.736 | 58.72 | 2.31 | R 1/4 | 8 3/4 | – | – | – | – |
| 18.80 | 0.740 | 59.06 | 2.32 | R 1/2 | 8 7/8 | – | – | – | – |
| 18.89 | 0.748 | 59.34 | 2.35 | R 3/4 | 9 | – | 19 | 18 | – |
| 19.10 | 0.752 | 60.00 | 2.36 | S | 9 1/8 | 60 1/4 | – | – | 20 1/4 |
| 19.22 | 0.757 | 60.38 | 2.38 | S 1/4 | 9 1/4 | – | – | – | – |
| 19.31 | 0.760 | 60.66 | 2.39 | S 1/2 | 9 3/8 | – | – | – | – |
| 19.41 | 0.764 | 60.98 | 2.40 | S 3/4 | 9 1/2 | – | 19 1/2 | 19 | – |
| 19.51 | 0.768 | 61.29 | 2.41 | T | 9 5/8 | 61 1/2 | – | – | 21 1/2 |
| 19.62 | 0.772 | 61.64 | 2.43 | T 1/4 | 9 3/4 | – | – | – | – |
| 19.84 | 0.781 | 62.33 | 2.45 | T 1/2 | 10 | – | 20 | 20 | – |
| 20.02 | 0.788 | 62.89 | 2.48 | U | 10 1/4 | 62 3/4 | – | 21 | 22 3/4 |
| 20.20 | 0.797 | 63.46 | 2.50 | U 1/2 | 10 1/2 | – | 20 1/4 | 22 | – |
| 20.32 | 0.800 | 63.84 | 2.51 | V | 10 5/8 | 63 | – | – | 23 3/4 |
| 20.44 | 0.805 | 64.21 | 2.53 | V 1/4 | 10 3/4 | – | – | – | – |
| 20.68 | 0.814 | 64.97 | 2.56 | V 1/2 | 11 | – | 20 3/4 | 23 | – |
| 20.76 | 0.817 | 65.22 | 2.57 | W | 11 1/8 | 65 | – | – | 25 |
| 20.85 | 0.821 | 65.50 | 2.58 | W 1/4 | 11 1/4 | – | – | – | – |
| 20.94 | 0.824 | 65.78 | 2.59 | W 1/2 | 11 3/8 | – | – | – | – |
| 21.08 | 0.830 | 66.22 | 2.61 | W 3/4 | 11 1/2 | – | 21 | 24 | – |
| 21.18 | 0.834 | 66.54 | 2.62 | X | 11 5/8 | 661/4 | – | – | 26 1/4 |
| 21.24 | 0.836 | 66.73 | 2.63 | X 1/4 | 11 3/4 | – | – | – | – |
| 21.30 | 0.839 | 66.92 | 2.64 | X 1/2 | 11 7/8 | – | – | – | – |
| 21.49 | 0.846 | 67.51 | 2.66 | Y | 12 | 67 1/2 | 21 1/4 | 25 | 27 1/2 |
| 21.69 | 0.854 | 68.14 | 2.68 | Y 1/2 | 12 1/4 | – | – | – | – |
| 21.89 | 0.862 | 68.77 | 2.71 | Z | 12 1/2 | 68 3/4 | 21 3/4 | 26 | 28 3/4 |
| 22.10 | 0.870 | 69.43 | 2.73 | Z +1/2 | 12 3/4 | – | – | – | – |
| 22.33 | 0.879 | 70.15 | 2.76 | Z+1 | 13 | – | 22 | 27 | – |
| 22.60 | 0.890 | 71.00 | 2.80 | Z+1.5 | 13.5 | – | – | – | – |
| 22.69 | 0.893 | 71.28 | 2.81 | Z+2 | – | – | – | – | – |
| 22.92 | 0.902 | 72.00 | 2.83 | Z+2.5 | – | – | – | – | – |
| 23.06 | 0.908 | 72.45 | 2.85 | Z+3 | – | – | – | – | – |
| 23.24 | 0.915 | 73.01 | 2.87 | Z+3.5 | – | – | – | – | – |
| 23.47 | 0.924 | 73.73 | 2.90 | Z+4 | – | – | – | – | – |
| 23.55 | 0.927 | 73.98 | 2.91 | Z+4.5 | – | – | – | – | – |
| 23.87 | 0.940 | 74.99 | 2.95 | Z+5 | – | – | – | – | – |
| 24.27 | 0.956 | 76.25 | 3.00 | Z+6 | – | – | – | – | – |
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