Adult bearded dragons typically reach a size of about 16 to 24 inches (40 to 60 cm) in length from snout to tail, with some variation depending on factors like sex and genetics. Males are generally larger than females and can grow closer to the upper end of this range, sometimes reaching up to 26 inches or about 2 feet, while females tend to be smaller but stockier

. In terms of weight, adult bearded dragons usually weigh between 280 to 550 grams (roughly 10 to 19 ounces), with juveniles growing rapidly during their first year before reaching full size by about 12 to 24 months of age

. Summary:

• Length: 16–24 inches (40–60 cm) on average; males can be larger, up to 26 inches (2 feet)
• Weight: 280–550 grams (10–19 ounces)
• Full size reached by 12–24 months old

This size range applies primarily to the common Central or Inland bearded dragon species (Pogona vitticeps), which is the most popular pet species