Note that measurements for different international ring sizing systems don't precisely align, so this chart shows a close equivalence across the different systems based on commonly used USA ring size measurements. Some European countries use a slightly different system where 40mm is deducted from the ISO size (so a ring with a 44mm circumference will be a size 4 in this system). ISO sizes are used in some European countries, but these size numbers simply correspond with the internal circumference in millimetres. The alphabetical or Wheatsheaf system is used for Australian ring sizes, but most jewellers in Australia will also accept the USA numerical system. We've included conversions for the numerical (USA), alphabetical (or Wheatsheaf) and European ring sizes. There is no difference between men's and women's ring sizes, so this chart applies to everybody. It shows sizes in diameter and circumference in both mm and inches. Which to Choose: Gold or Silver Jewellery?.
If you don't know your ring size or don't know how to get correct measurements to use when referring to the ring sizing chart below, then you're in luck: we're here to help. Need more information about how work out your ring size in the first place? Read on to learn how to get it right. It includes ring size measurements in mm and inches, along with information about the different international ring sizing systems. If you already know your ring measurement or need to convert a ring size between different measuring systems, scroll down to our international and Australian Ring Size Chart. It’s important to know your size before buying rings online and our ring size chart below can help you work out sizing in USA, European, British and Australian ring size systems for both men and women. Finger sizes vary a lot from one person to the next and it can be almost impossible to get your ring size right just by guessing.