The only EXACT numbers you can get is for BUILDING AEQ. If you roll for your AEQ pieces you can (usually) get them for much less than building them. Here's what I know about building AEQ;
The maximum cost for the initial build is 125 BT's (+3 skill costs 50 BT's + the highest cost for a SA or a 5% bonus of choice is 75 BT's = 125 BT's max cost).
It costs 30 BT's for each upgrade. There are 10 upgrades possible for each piece. That's 300 BT's. For a final maximum cost of 425 BT's per piece of AEQ.
Knowing that number (425) and knowing how many AEQ pieces you plan on getting gives you how many BT's you'll need. The rest is simple math.
If you're considering rolling for your AEQ, here's a link to some advice about it.
http://goallineblitz.com/game/forum_thread.pl?thread_id=5099377Rolling is a random thing and it's kinda impossible to get exact math when things are random... but the way to get around that is to get (roll for) the (AEQ) pieces first without putting anything into upgrades. Then, once you have all 2, 3, or 4 pieces, you'll know exactly how many BT's you have left and exactly how many you'll need to completely upgrade them all... and therefore you'll know when to switch to light training and how long you can safely multi-train.
