Eucalyptus platypus is a mallee or a marlock that typically grows to a height of  and a width of   with a dense, rounded crown but does not form a lignotuber. The bark is smooth, brownish or copper-coloured. Young plants and coppice regrowth have egg-shaped to more or less round leaves  long and wide.
Mallee or marlock Eucalyptus species typically grows to a height of  and a width of   with a dense, rounded crown but does not form a lignotuber. The bark is smooth, brownish or copper-coloured. Young plants and coppice regrowth have egg-shaped to more or less round leaves  long and wide.