A larger and more slender bird than its more common relative the pied currawong, the adult grey currawong ranges from 44 to 57 cm (17 to 22 in) in length, with an average of around 52 cm (20 in); the wingspan varies from 72 to 85 cm (28 to 33 in), averaging around 78 cm (31 in), with an average weight of around 350 g (12 oz).
Adults of the Tasmanian subspecies average around 440 g (16 oz).
The male is on average slightly larger than the female, but the size and weight ranges mostly overlap.
It is generally a dark grey bird with white in the wing, undertail coverts, the base of the tail and most visibly, the tip of the tail.
It has yellow eyes.
The orbital (eye-ring), legs and feet are black, whereas the bill and gape range from greyish black to black.
The overall plumage varies according to subspecies.
The nominate race versicolor and plumbea are slate-grey in colour, while melanoptera and intermedia are blackish-brown, and arguta of Tasmania and halmaturina a sooty black.
The size of the white patch on the wing also varies, being large and easily spotted in versicolor, plumbea, intermedia and arguta, but non-existent or indistinct in melanoptera and halmaturina.

More specifically, the nominate subspecies has a grey forehead, crown, nape, ear-coverts and throat with the face a darker grey-black.
The feathers of the throat are longer, giving rise to hackles there.
The upperparts and underparts are a brownish-grey and become more brown with age.
Towards the belly, the feathers are a paler grey.
The wings are grey-brown, and the blackish primaries have white edges which merge to form the prominent white wing markings.

Birds appear to moult once a year in spring or summer, although observations have been limited.
Young birds spend about a year in juvenile plumage before moulting into adult plumage at around a year old.
Juvenile birds have more brown-tinged and uniform plumage; the darker colour around the lores and eyes are less distinct.
Their blackish bill is yellow-tipped, and the gape is yellow.
Their eyes are brownish, but turn yellow early.
The exact timing is unknown but likely to be around four months of age.
A larger and more slender bird than its more common relative the pied currawong, the adult grey currawong ranges from 44 to 57 cm (17 to 22 in) in length, with an average of around 52 cm (20 in); the wingspan varies from 72 to 85 cm (28 to 33 in), averaging around 78 cm (31 in), with an average weight of around 350 g (12 oz). Adults of the Tasmanian subspecies average around 440 g (16 oz). The male is on average slightly larger than the female, but the size and weight ranges mostly overlap. It is generally a dark grey bird with white in the wing, undertail coverts, the base of the tail and most visibly, the tip of the tail. It has yellow eyes. The orbital (eye-ring), legs and feet are black, whereas the bill and gape range from greyish black to black. The overall plumage varies according to subspecies. The nominate race versicolor and plumbea are slate-grey in colour, while melanoptera and intermedia are blackish-brown, and arguta of Tasmania and halmaturina a sooty black. The size of the white patch on the wing also varies, being large and easily spotted in versicolor, plumbea, intermedia and arguta, but non-existent or indistinct in melanoptera and halmaturina.
More specifically, the nominate subspecies has a grey forehead, crown, nape, ear-coverts and throat with the face a darker grey-black. The feathers of the throat are longer, giving rise to hackles there. The upperparts and underparts are a brownish-grey and become more brown with age. Towards the belly, the feathers are a paler grey. The wings are grey-brown, and the blackish primaries have white edges which merge to form the prominent white wing markings.
Birds appear to moult once a year in spring or summer, although observations have been limited. Young birds spend about a year in juvenile plumage before moulting into adult plumage at around a year old. Juvenile birds have more brown-tinged and uniform plumage; the darker colour around the lores and eyes are less distinct. Their blackish bill is yellow-tipped, and the gape is yellow. Their eyes are brownish, but turn yellow early. The exact timing is unknown but likely to be around four months of age.
Grey currawong