The size of the liver varies depending on age, sex, body size, and shape, as well as the particular examination technique utilized. The liver grows as you age, and in adults, it weighs a little more than 3 pounds. The normal liver size varies by person depending on their sex, age, height, weight, and body size. According to a study published in the journal Indian Pediatrics, the average liver length for boys between the ages of 1 and 12 years ranges from 2.6 in. (6.5 cm) to 5.0 in. (12.6 cm), while for girls, it ranges from 2.4 in. (6.2 cm) to 4.8 in. (12.2 cm) . However, it is important to note that these are just averages and that liver sizes can vary slightly. Therefore, it is best to consult a medical professional for an accurate assessment of liver size.