What's wrong with my calc? It should work fine, if you use it correctly. Remember that everything described includes the zone which it is on, so if it says conquering an extractor, you only type that you conquer it there, and don't type it into the zone cells as well. In other words, each zone is only entered once into the calc.
Remember that the zones become 5 times as expensive to conquer if they're two zones away, 10 times if they're 3 away, etc. (the rules say more about this). You overspent this turn.