Size Guide

Identify Your Ring Size

Inside diameter (in) Inside diameter (cm) Inside circumference (in) Inside circumference (cm) US & CA UK & AU Kostis Jewellery
0.65 16.51 2.05 52 6 52
0.68 17.32 2.17 55 7 55
0.71 18.14 2.24 57 8 57
0.75 18.95 2.36 60 9 60
0.78 19.76 2.44 62 10 62
0.81 20.57 2.56 65 11 65


hand with stringrulerring

How to Calculate Ring Size

Accurately measuring your finger for its ring size is very simple. There is a standard conversion scale. Note that it’s best to measure your finger later in the day; fingers do swell a bit and you might have trouble removing a ring if you don’t take this into account when sizing.

Things you will need:
1. Ruler
2. Thin Strip of paper / string / thread

Ring Sizing Chart for Measuring Your Finger Size Appropriately

Here is a chart that will be extremely helpful for you to determine the ring size that you need. You can either make use of a tape or a small piece of string/paper/thread to measure the area that will be occupied by the ring. When it becomes a complete circle, make a mark on such string/paper/thread. This will be helpful for you to compare with the chart that is mentioned below. For extra width, you can add another size to accommodate.


1. Cut a thin strip of paper/ thread.
2. Wrap the paper around your finger. Make sure the paper is below the joint of your finger and close to your knuckle.
3. Mark the spot where the paper/thread meets and measure the distance with your ruler.
4. Use the following chart to determine your ring size. Rings also come in half sizes, the measurements of which, of course, will fall somewhere in between the whole sizes