In many ham radio descriptions, wire dimensions for coils or transformers are given in AWG (American Wiring Gauge). Here is a little table to help you converting AWG to metric units. The formula to make this conversion is : Where: mm = diameter in mm AWG= diameter in AWG For : # 0000 AWG=3 # 000 AWG=2 # 00 AWG=1 # 0 AWG=0