ballast formula

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Original poster: "James T by way of Terry Fritz <twftesla-at-uswest-dot-net>" <jamest2000-at-att-dot-net>

Hi All,
 I was wondering if anyone had some math that may help.
I would like to use a transformer core for a ballast. Given the
dimensions, magnetic properties, frequency, current ect. , is there a
way to calculate turns = inductance? Lets assume an ungapped core, say
an EI type.
 I have the formulas to calculate inductance = reactance.  From that I
can calculate current. How do you calculate inductance without trial and
error?
 If you have the answer, please speak slowly, as my math skill are
lacking. :-)
James T