This is the current UK ring size guide. We have also included the USA size guide for comparison for if you are shopping from over seas. We find the easiest way to measure your finger is to use a piece of cotton wrapped around your finger and then measured against a ruler or tape. Please be aware that you want your ring to be comfortable so do not pull the string tight around your finger.
Keep in mind that as a rings shank or band becomes wider the size will usually get larger. As a general rule add one size for every 3 mm of thickness.