Leopard geckos typically grow to the following sizes:

• Adult females usually reach about 18 to 20 cm (7.1 to 7.9 inches) in length and weigh around 50 to 70 grams.
• Adult males tend to be larger, measuring about 20 to 28 cm (7.9 to 11.0 inches) in length and weighing between 60 to 80 grams

Most sources agree that fully grown leopard geckos range from 7 to 11 inches in length, with males generally being larger than females by an inch or two

. Growth is rapid in the first 6 months and slows after the sub-adult stage (around 7-8 months), with geckos reaching full adult size by about 18 months

. In summary, a typical adult leopard gecko is about 7 to 11 inches long, with males on the larger end of that range.