Good find Joe, It's more advanced than my air-core calculator because it accounts for the parasitic capacitance.
Happy Thanksgiving! I thought the coil calculator looked FB and thanks for the comment.
BTW, do you have a coil winding machine or do you do it the old fashioned way? I see coil winders from time to time on epay; but they command Gi-huge-ic sums of money.
If you don't have one, do you have any thoughts on rolling your own to roll your own, so to speak - hi? I have an old hand drill I'd fancy making a coil winer with. No turns counter on it, but it's better than nuthin.