OK coilers, please help me on this: I'm writing a Tesla coil calc program (well, just for me to understand it better and get familiair with the calcs), but I don't know how to calculate the capacitance of a coil. I could of course use Medhurst's formula (is there a table for H/D ratio > 5?), but I wanted to know if there's another way to calc it too. Thanks, Reinier BTW: It's only going to handle metric units!