Useful site on coiling for all your needs,
Coil wrapping | Steam Engine | free vaping calculators
Good for novice to accelerate quickly towards advance users.
Takes into account on and lets you enter:
coil gauge, material and profile
inner diameter, - the diameter of rod used
type of coil - single/dual/triple/quad
Target resistance, and even
Leg length
It then summarise into a instruction on how to wrap: E.g.
Summary – how to wrap it
Resistance wire length (contact points not included) 63.2 mm
Number of wraps 10.23
— rounded to "full wraps" 10
— rounded to "half wraps" 11/10
Leg power loss 7.9%
the leg length is important cuz it lets you understand what is leg loss and importance of keep leg as short as possible. At lower resistance, a leg length of 10mm can easily result in >30% loss in power as heat.
Ttested using many times and it shows high degree of accuracy.
Once you look at how the parameters changes, it answers many questions on what/how/why etc.
Have fun!