All our ring sizing is in Australian standard. This is measured by the diameter of the ring. Below is a table of each size and the US equivalent.
To find your size, measure the width of your chosen finger and then match the width with one of the sizes in the table below. To measure the width, use a measuring tape (or the printable ruler in the size guide PDF) and mark both sides of your finger. Removing your finger you will have marked out the exact width of your finger, and you will be able to find the diameter and size that matches.