RING SIZING GUIDE

Here is a conversion chart for all the different ring sizes.  
At Eternal Spirit, we use the alphabet because it seems more relatable to most people.  In other words, the later on in the alphabet it is, the bigger the size and vice versa.  We don't stock any sizes prior to the letter "I" because they're generally regarded as kids sizes and we don't stock rings for kids.
As a general rule, we consider sizes I to N to be small. 
O to R are your average sizes for most fingers.
Anything above S is large and would suit bigger fingers.