Find your diameter

 

Diameter is the measurement across the inner width of the ring
You'll need:
  • A ring that fits you
  • Ruler

 

Step 1:

Find a ring that fits.

 

Step 2:

Lay ring on top of ruler, and measure the widest area inside the ring from inner edge to inner edge. Round to the closest whole millimetre.

 

Tip:

If your ring is a different shape and is not circular, measure the shortest distance across.