Using String
One of the easiest ways to assess your ring size is to measure your finger with a strip of paper or string:
• Start by cutting out a strip of paper that is approximately 3/4-inch wide and 4 inches long.
• Wrap the paper around the base of the intended finger, and then mark where the paper overlaps. The length of the paper you measured in millimetres is the circumference of
your finger
• After finding this measurement, use our conversion chart to find the corresponding ring size.
• If the size of your finger below the knuckle drastically differs in size from the knuckle itself, measure your knuckle as well. Then, choose a size that falls more in the middle of these two measurements.

measurements (mm)

49.3

50.6

51.8

53.1

54.4

55.7

56.9

58.2

59.5

ring size

5

5.5

6

6.5

7

7.5

8

8.5

9

Using a ring you already have (make sure it is round and not misshapen);
If you have a ring that already fits your finger well, you can use a ruler to measure the inside diameter of this ring:
  1. Take your ruler and measure straight across the inside of the ring from edge to edge.
  2. Take the diameter measurement in millimetres, and then use our measurement-conversion chart to find your ring size. 

measurements (mm)

15.6

16

16.45

16.9

17.3

17.7

18.2

18.6

19

ring size

5

5.5

6

6.5

7

7.5

8

8.5

9