Cage - What is the minimum cage size for macaws?

What is the minimum cage size for macaws?

So I can get a big cage for my future macaw I am looking at milligolds and catablus. They are an average to large size.

When purchasing a cage for any bird, the best rule to go with, is by the bird's wingspan and tail length. A macaw's wingspan is usually reaches up to 45 inches long. The length of your macaw's tail will vary. The bigger the cage, the better. The smallest cage you could possibly have for your bird would be 45" x 3' (as a rough estimate). The cage size also depends on the macaw specie since they all range from a variety of different sizes. I hope this brief answer was enough to answer your question. Your local pet shop, bird veterinarian, or the place you will be getting your bird from will be more than happy to help you decide on a cage size for your bird. Good luck!
It depends on what kind of macaw. Some of the mini macaws are relatively small (the size of a large conure), whereas a a greenwing macaw is much bigger (up to 35" in length, with a 45" wingspan). Either way, your cage is going to be MUCH bigger than most people would expect. That's because your macaw will need ample room to move around, and once you get the minimum number of perches and toys in there, a small cage will quickly become cramped. For an average macaw (not a mini and not one of the largest species), I'd say at least 30"x40" (and about 6' tall).