Eastern quolls have a body height ranging from 17.8 centimeters to 4.5 meters, and a body length ranging from 32 to 45 centimeters; their mass varies from 0.71 to 0.74 kilograms. The embryo stage is characterized by a body mass of 0 grams and a body length from 5 millimeters to 1.5 centimeters. During the pup stage, the young have a body mass ranging from 0.1 to 80 grams and a body length from 2 to 10 centimeters. Adult eastern quolls weigh from 0.8 to 1.3 kilograms and measure from 35 to 45 centimeters in length.