There isn’t just one species of Kangaroo because there is a wide range of species of Kangaroo. Each species have different physical adaptions. Some species grow bigger and some smaller depending on the species.
The question how big can a Kangaroo get is a pretty general one so I’ll tell you what the biggest Kangaroo is. I’ll also give some ideas as to how big other types of Kangaroo get as well as the smallest.
The largest Kangaroo is the Red kangaroo (Macropus rufus). As a matter of fact, it’s the largest marsupial on Earth. Red Kangaroos can grow to heights taller than an adult man. They can grow to over 2 meters tall and weigh almost 100 kilograms.
The largest officially recorded “Red” measured about 2.1 meters tall, it weight 91 kilograms. Even still, there are reports of “Reds” of even larger sizes and weighing over 150 kilograms.
These Kangaroos can jump to lengths of around 10 meters in one singe jump.
Other species of Kangaroo reach to heights of about 1 - 1.2 meters depending on species with a weight of around 50 – 60 kilograms. This is not an accurate idea because of the wide species range.
The smallest Kangaroo species is the musky rat-kangaroo (Hypsiprymnodon moschatus). It only grows to about 23 cm with a weight about half a kilogram (500g).