20 x 16 in. (50.8 x 40.6 cm.) 24 x 20 x 2 1/2 in. (61 x 50.8 x 6.4 cm.) ...

Here are some size recommendations for different species: For smaller birds, like budgies, canaries, and finches, a cage that is at least 18 inches wide by 18 inches deep and 18 inches tall is good.