Silverback gorillas typically stand between about 5 feet (1.5 meters) and 6 feet (1.8 meters) tall when standing upright. More specifically, average heights range from approximately 5.6 to 5.9 feet (1.7 to 1.8 meters), though some sources note a range from 4 feet 11 inches (1.5 m) up to nearly 6 feet tall

. To summarize:

• Common height range: 1.5 to 1.8 meters (4 ft 11 in to 5 ft 11 in)
• Average adult male silverback height: around 5.6 to 5.9 feet (1.7 to 1.8 meters)
• Exceptional individuals can be taller, with the tallest wild gorilla recorded at 1.95 m (6 ft 5 in)

This height variation depends on subspecies and individual differences, but generally silverbacks stand about 5.5 to 6 feet tall when upright.