Measure a Ring You Already Have
If you have a ring that already fits your finger well, you can use a ruler to measure the inside diameter of this ring:
1. Take your ruler and measure straight across the inside of the ring from edge to edge.
2. Take the diameter measurement in millimetres, and then use our measurement-conversion chart to find your ring size.
Now that you know your accurate ring size, you can ensure the ring you love fits like a charm.