A silverback gorilla, which is an adult male mountain gorilla, typically stands between 1.5 to 1.8 meters tall (approximately 4 feet 11 inches to 5 feet 11 inches) when standing upright

. Some sources note that silverbacks can reach up to about 6 feet tall, especially in the case of mountain gorillas

. Their arm span ranges from about 2.3 to 2.7 meters (7 feet 7 inches to 8 feet 10 inches)

. In summary, the height of a silverback gorilla generally falls within this range:

• Average height: 1.5 to 1.8 meters (4 ft 11 in to 5 ft 11 in)
• Occasionally up to 1.8 meters or about 6 feet tall in some mountain gorillas

This height makes silverbacks the largest primates alive, with a very muscular and stocky build