How to Determine Your Ring Size

There are several systems for denoting the sizes of jewellery rings in use around the world. While conversion charts are available, it can be pretty confusing if you are not sure of your ring size in the first place. At Moonfire Charms, we use the US ring size system. Here’s a quick guide to determining your ring size with a few simple tools.

If you already have a ring you currently wear, simply measure the diameter of the ring. This measurement is known as the “inside diameter”.  You can then find the corresponding measurement on the ring size conversion chart below.

Measuring the ring diameter

If you do not have a ring, simply do the following:

1. Get a strip of paper or a piece of string.
The paper strip or string should be at least 10 cm long.

2. Wrap the paper or string around the base of the finger you want to measure.
The string should be wrapped snugly around the base of the finger – not too loose or tight to ensure a better measurement.

3.  Mark the string or paper where the circle around your finger is completed.
A marker, pen or pencil will do the job!

4. Find out the length of your ring measurement.
Use a ruler or tape measure to measure the beginning to the marked end.  This measurement is known as the “inside circumference” of your finger.

5. Check the chart below to determine your ring size.
When in doubt between two sizes, it is safer to take the larger ring size to ensure that the ring will definitely fit you.

Ring Size Conversion Chart

Inside diameter	Inside diameter	Inside circum- ference	Inside circum- ference	Size
(in)	(mm)	(in)	(mm)	United States and Canada
0.458 0.466 0.474 0.482 0.49 0.498 0.506 0.514 0.522 0.53 0.538 0.546 0.554 0.562 0.57 0.578 0.586 0.594 0.602 0.61 0.618 0.626 0.634 0.642 0.65 0.658 0.666 0.674 0.682 0.69 0.698 0.706 0.714 0.722 0.73 0.738 0.746 0.754 0.762 0.77 0.778 0.786 0.794 0.802 0.81 0.818 0.826 0.834 0.842 0.85 0.858 0.866 0.874 0.882 0.89 0.898 0.906 0.914 0.922 0.93 0.938 0.946 0.954 0.962 0.97	11.63 11.84 12.04 12.24 12.45 12.65 12.85 13.06 13.26 13.46 13.67 13.87 14.07 14.27 14.48 14.68 14.88 15.09 15.29 15.49 15.7 15.9 16.1 16.31 16.51 16.71 16.92 17.12 17.32 17.53 17.73 17.93 18.14 18.34 18.54 18.75 18.95 19.15 19.35 19.56 19.76 19.96 20.17 20.37 20.57 20.78 20.98 21.18 21.39 21.59 21.79 22 22.2 22.4 22.61 22.81 23.01 23.22 23.42 23.62 23.83 24.03 24.23 24.43 24.64	1.44 1.46 1.49 1.51 1.54 1.56 1.59 1.61 1.64 1.67 1.69 1.72 1.74 1.77 1.79 1.82 1.84 1.87 1.89 1.92 1.94 1.97 1.99 2.02 2.04 2.07 2.09 2.12 2.14 2.17 2.19 2.22 2.24 2.27 2.29 2.32 2.34 2.37 2.39 2.42 2.44 2.47 2.49 2.52 2.54 2.57 2.59 2.62 2.65 2.67 2.7 2.72 2.75 2.77 2.8 2.82 2.85 2.87 2.9 2.92 2.95 2.97 3 3.02 3.05	36.5 37.2 37.8 38.5 39.1 39.7 40.4 41 41.7 42.3 42.9 43.6 44.2 44.8 45.5 46.1 46.8 47.4 48 48.7 49.3 50 50.6 51.2 51.9 52.5 53.1 53.8 54.4 55.1 55.7 56.3 57 57.6 58.3 58.9 59.5 60.2 60.8 61.4 62.1 62.7 63.4 64 64.6 65.3 65.9 66.6 67.2 67.8 68.5 69.1 69.7 70.4 71 71.7 72.3 72.9 73.6 74.2 74.8 75.5 76.1 76.8 77.4	0 ¼ ½ ¾ 1 1¼ 1½ 1¾ 2 2¼ 2½ 2¾ 3 3¼ 3½ 3¾ 4 4¼ 4½ 4¾ 5 5¼ 5½ 5¾ 6 6¼ 6½ 6¾ 7 7¼ 7½ 7¾ 8 8¼ 8½ 8¾ 9 9¼ 9½ 9¾ 10 10¼ 10½ 10¾ 11 11¼ 11½ 11¾ 12 12¼ 12½ 12¾ 13 13¼ 13½ 13¾ 14 14¼ 14½ 14¾ 15 15¼ 15½ 15¾ 16