When winding a coil, the resistance (measured in Ohms) depends not only on the material but also on the thickness and length of the wire. The thicker the wire (D), the less resistance, and the longer the wire (L), the more resistance. Mathematically expressed as:
ohm resistance = Constant x L/D where the constant depends on the material's resistance and temperature.
0.16 mm is 34 gauge
0.20 mm is 32 gauge
0.30 mm is 28 gauge
0.40 mm is 26 gauge
0.50 mm is 24 gauge
0.65 mm is 22 gauge
Coils with less resistance produce more vapour, but also use more battery and juice, and do not last as long before they wear out.
So the best advice we can give is to experiment.
Use this free tool to calculate exactly how to wind the perfect dual coil or single coil based on wire thickness, length, ohm resistance, etc.
Click Here 