Kangaroos grow to anywhere between 2 ft 7.5 in and 5 ft 10 in tall and weigh between 28.6 to 145 pounds. Red kangaroos are the largest and eastern gray kangaroos are the heaviest species. Exercise, genes, and nourishment determine their growth.
Kangaroos are often pictured as cute and fluffy animals by nature lovers. They live in most people’s minds as joyful little creatures hopping around in Australia.
You might be surprised to learn that Kangaroos can get huge. But how big do they get exactly and what makes them grow?
This article covers everything you need to know about kangaroos’ height, weight, and the factors that determine their growth.
How Tall Are Kangaroos?
Full-grown kangaroos are between 2 ft 7.5 in and 5 ft 10 in tall. Different kangaroo species have different sizes. Red kangaroos are the biggest species and the smallest are the black wallaroos.
Kangaroos’ height differs from species to species. Here are the six kangaroo species from largest to smallest:
- Red kangaroo
- Eastern gray kangaroo
- Western gray kangaroo
- Antilopine kangaroo
- Common wallaroo
- Black wallaroo
You can read about different kangaroo species’ sizes in more detail later in the article.
Average Kangaroo Height
Kangaroos are 31 to 71 in tall, on average. Their height is determined by their species, age, and gender. Kangaroo males are taller than kangaroo females.
The height of kangaroos greatly varies on three factors:
Regardless of species, kangaroo males tend to grow much bigger than females. Age also plays a huge part. Kangaroo joeys are born about one inch long and grow to their full size when they reach adulthood.
|3 ft 3.4 in—5 ft 10 in
|2 ft 7.5 in—3 ft 7 in
|1 inch at birth
Male Kangaroo Average Height
Kangaroo males are much taller than females on average. The smallest males (black wallaroos) are around 3 ft and 3.4 in and the biggest ones are red kangaroo males at that measure.
Female Kangaroo Average Height
Kangaroo females’ are much shorter than males. They evolved to be shorter as they do not brawl with each other and aren’t tasked with defending the mob. Black wallaroo females are about 2 ft 7.5 in tall and red kangaroo does are 3 ft 7 in tall.
Baby Kangaroo Height
Baby kangaroos are born about one inch long. They are hairless, blind, and severely underdeveloped at birth. The babies need to crawl inside their mother’s pouch to develop.
In about 15 to 24 months, joeys grow to their full size which can be 72 times bigger than their length at birth.
How Big Do Kangaroos Get in Captivity?
Captive kangaroos generally grow to their full size. They need special care to develop correctly. Kangaroos need large living space and proper food to reach their full size.
Kangaroos are persevering animals. They are used to the harsh weather conditions of their native Australia and evolved to be tough. Regardless, they still need proper space and food to grow.
How Much Space Do Captive Kangaroos Need to Grow?
Kangaroos in captivity need about 50 ft2 to move around and brawl. They are active animals that cover vast distances in the wild. Kangaroos need a lot of space for muscle development.
What Food Do Captive Kangaroos Need to Grow?
Kangaroos are herbivores and survive on plants in the wild.
Captors should provide them with vegetation they would find in their natural habitat:
Kangaroos’ food intake depends on their development and weight. A 55 pounds red kangaroo female eats about one pound and a 132 pounds male eats two pounds of dry matter per day.
One-year-old joeys need about 95% of an adult female’s daily energy intake.
Average Kangaroo Weight
Kangaroos weigh between 37.5 and 145 pounds. The heaviest species are the eastern gray kangaroos and the lightest are the black wallaroos. Males are much heavier than females.
Kangaroos’ weight depends on their species. Although red kangaroos are the largest, the eastern gray kangaroos are the heaviest on average.
Here are the six kangaroo species from heaviest to lightest:
- Eastern gray kangaroo
- Red kangaroo
- Western gray kangaroo
- Antilopine kangaroo
- Common Wallaroo
- Black Wallaroo
|0.03 ounces at birth
Kangaroo Male Average Weight
The average weight of kangaroo males is anywhere between 48.5 to 145 pounds. Although the eastern gray kangaroos are the heaviest on average, the individuals weighing the most are usually red kangaroos. They can reach a body mass of 200 pounds.
Male kangaroos are muscular. Their society is hierarchical and males often fight to assert dominance. The alpha male is the largest and strongest of the mob and the strongest around.
Kangaroo Female Average Weight
Kangaroos females weigh less than males. They are usually about half the weight of their male counterparts.
Female kangaroos don’t need to be muscular as their role is to nurture and care for their young. They usually don’t get into fights.
Baby Kangaroo Average Weight
Baby kangaroos are underdeveloped at birth and weigh only about 0.03 ounces. They grow rapidly throughout their childhood. A red kangaroo joey can gain as much as 0.5 pounds between 20 and 100 days old.
Kangaroo Growth Chart
Kangaroos grow at a breakneck speed in their childhood. They are born weighing 0.03 ounces, but they can be a thousand times as heavy by one year old. Kangaroos are fully grown when they reach adulthood at sexual maturity (males: 24-40 months, females: 15-30 months).
The growth of kangaroo joeys is unprecedented in the animal kingdom. From when they are born until adulthood they can grow thousands of times their original size.
Kangaroos have four life stages:
- Young of the year
|Around 1 in
|Young of the year
|1 it to around 3 ft
|Around 3 ft—adult height
|2 ft 7.5 in to 5 ft 10 in
When Are Kangaroos Fully Grown?
Kangaroos reach their full height when they reach adulthood. Kangaroo males can build a considerable amount of muscle during their childhood and when they are adults.
Kangaroos become adults when they reach sexual maturity. Males reach maturity later than females on average.
|Age at Sexual Maturity
Factors that Influence Kangaroo Growth
Kangaroos’ growth is inconsistent. An individual living in more arid regions with poor quality vegetation may not reach its full potential size. Kangaroos also need daily movement for muscle development.
Here are the main factors that influence kangaroos’ growth:
- Nutrient intake
- Water availability
- Exercise quality and quantity
Kangaroo Species Size Comparison
Each kangaroo species have different heights and weights. Males are generally taller and heavier than females.
Eastern gray kangaroo males are the heaviest, and red kangaroo males are the largest.
|Average Adult Male Height
|Average Adult Female Height
|Average Adult Male Weight
|Average Adult Female Weight
|Eastern gray kangaroo
|Western gray kangaroo
Kangaroos are the largest mammals of Australia. They can be as tall as 5 ft 10 in and as heavy as 145 pounds on average. Red kangaroos are the largest and eastern gray kangaroos are the heaviest kangaroo species.
Kangaroos grow rapidly after they are born. They can be thousands of times as big as their at-birth size. Kangaroos’ growth is determined by gender, species, nutrient intake, and exercise.
How Big Is the Biggest Kangaroo?
The biggest kangaroo ever was 6.9 ft tall and weighed 201 pounds. It was a red kangaroo male. The biggest kangaroo species is the extinct Procoptodon. It was about 6.6 ft tall and weighed between 440-530 pounds.
Are Kangaroos Bigger Than Humans?
Kangaroos can be bigger than humans, but they are generally not. Even the largest species, the red kangaroos, are usually smaller than humans. The biggest kangaroos can be taller. Some individuals grow as tall as 5 ft 10 in. The average US male’s height is 5 ft 9 in.
Are Kangaroos Considered Big Animals?
Kangaroos are considered fairly big animals. They are the largest mammals in Australia and the largest marsupials in the world. Australia’s biggest animal, the saltwater crocodile, is much bigger than kangaroos. Red kangaroos are 4.9 ft on average while saltwater crocodiles can be 17 ft long.
How Long Are Kangaroo Tails?
Kangaroo tails are between 3.5 to 43.5 in long. An adult kangaroo’s tail can be almost as long as its height. Kangaroo tails are muscular, as they use them for balance or to lift themselves from the ground when they kick.