This depends on what sort of breed it is as most parrots are different sizes.
The largest parrot is the Hycanith Macaw which is around 39-42 inches long when it's fully grown.
The smallest parrot probably is the buff-faced pygmy parrot which is 8-10 cm long when it's fully grown.
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The term "parakeet" actually is applied to quite a few different unrelated species of small to medium parrots that range in size from around 20 cm long to nearly 50 cm. Most of them are characterized by long tail feathers.
Parakeets are beautiful and vocal birds. They come in varying sizes and types, how big they get depends on their species. Typically they can get from 6 to 18 inches.
it all depends on the species of parrot. remember parrots are not domestic so they do not have breeds.