Britannica Sources used in this answer

How do orangutans compare in size with gorillas and chimpanzees?

Created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.

An illustration of a female Bornean orangutan (Pongo pygmaeus) with long reddish-brown fur, hanging from tree branches with one arm extended upward and one leg hooked over a branch. A scale bar at the bottom shows lengths of 30 centimeters and 12 inches for size reference. — orangutan Female orangutans (*Pongo*) have the longest breeding interval of any mammal, giving birth on average once every eight years.

When comparing the size of orangutans to gorillas and chimpanzees, it is important to note that while orangutans are the largest arboreal animals, they are not as powerfully built as gorillas.12

Gorillas vs. Orangutans: Gorillas are the largest of all apes and are significantly larger than orangutans when comparing adults of the same sex. An adult male gorilla typically weighs between 135–220 kg (300–485 pounds) and stands about 1.7 meters (5.6 feet) tall, whereas an adult male orangutan weighs approximately 130 kg (285 pounds) and stands about 1.3 meters (4.3 feet) tall.1
Chimpanzees vs. Orangutans: Orangutans are larger than chimpanzees. Chimpanzees generally stand 1–1.7 meters (3–5.5 feet) tall and weigh between 32–60 kg (70–130 pounds). In contrast, adult male orangutans are much heavier, reaching up to 130 kg (285 pounds).231

In all three species, males are typically larger and more robust than females.132