Rose-ringed parakeets measure on average 40 cm (16 in) in length including the tail feathers. Their average single wing length is about 15–17.5 cm (5.9–6.9 in). The tail accounts for a large portion of their total length.
The Rose-ringed parakeet is sexually dimorphic. The adult male sports a red neck-ring and the hen and immature birds of both sexes either show no neck rings, or display shadow-like pale to dark grey neck rings.