- Measure the inner diameter of your ring with a ruler.
- Measure the circumference of your finger with a thread. Wind it around your finger and cut it where the ends meet and straighten it to measure on a ruler.
- You can also go to the nearest jewelry store and ask them to measure your ring or finger.
There are several systems in use around the world for denoting the sizes of rings.
I live in Denmark and here its common to use the rings circumference in mm.
So when you order a ring be avare of converse your size to the danish size.
I use colon two the "Size (mm)" in the chart under.