How to calculate men's and women's ring sizes

Updated August 08, 2017

Although, in most cases, you can have a ring re-sized by a jeweller after it has been purchased, it's still a smart idea to know what your ring size is before exchanging money. Knowing your ring size allows you to purchase the jewellery with confidence even if don't have the option of trying it on beforehand. This is especially true when you are purchasing a ring from the internet. For both, men and women, ring sizes range from a Size 3 to a Size 16. If you want more peace of mind after determining your ring size on your own, verify the size by going to a local jeweller and getting measured. Note that ring sizes are the same for both men and women.

Cut a piece of string, 5 inches to 6 inches long. It can be any type of string or ribbon, long as it's durable and won't snap.

Wrap the string around the base of the finger you're measuring. Use your thumb to hold down the base of the string or have someone assist you.

With either a marker or a pen, mark the spot on the string where it overlaps the end pressed to the base of the finger. The string should have made a full circle. Do not stretch too taught.

Unwrap the string from your finger and measure the length in millimetres from the base of the string to the point you marked.

Compare your measurements to a ring chart as given below.

Size 3 corresponds to 44.1 millimetres. Size 3 corresponds to 44.1 millimetres. Size 3.5 corresponds to 45.4 millimetres Size 4 corresponds to 46.7 millimetres Size 4.5 corresponds to 48 millimetres Size 5 corresponds to 49.2 millimetres Size 5.5 corresponds to 50.5 millimetres Size 6 corresponds to 51.8 millimetres Size 6.5 corresponds to 53.1 millimetres Size 7 corresponds to 54.3 millimetres Size 7.5 corresponds to 55.6 millimetres Size 8 corresponds to 56.9 millimetres Size 8.5 corresponds to 58.2 millimetres Size 9 corresponds to 59.4 millimetres Size 9.5 corresponds to 60.7 millimetres Size 10 corresponds to 62 millimetres Size 10.5 corresponds to 63.3 millimetres Size 11 corresponds to 64.5 millimetres Size 11.5 corresponds to 65.8 millimetres Size 12 corresponds to 67.1 millimetres Size 12.5 corresponds to 68.3 millimetres Size 13 corresponds to 69.7 millimetres

Things You'll Need

  • String
  • Pen
  • Ruler
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About the Author

Wendy Rose Gould is a professional journalist who has contributed to "Glamour" magazine and the Huffington Post, among other publications. After internships at the "Indianapolis Business Journal," "Kiwanis International" and "NUVO Newsweekly," she earned BA degrees in journalism and philosophy from Franklin College in 2008. Gould specializes in lifestyle topics.