Measure the internal diameter of a ring that you already own and that you put on the finger on which you would also like to wear the ring you are about to buy.

Option 1:

Take the ring and a ruler

Position your ring on the ruler, making sure that the widest internal part is exactly on the millimeter marks

Take note of the measurement you just recovered and compare it to this table below

Option 2:

Print the ring sizer sheet and directly superimpose your ring on the circles referring to the measurement, or cut out the paper ring sizer.