GRAM and for the Adult female is 1198 gram.At age 20, the average weight of the male brain is approximately 1400g and at the age of 65, brain weight is approximately 1300 g. Brain weight for females follows a similar pattern.The adult human brain weighs about 3 pounds (1,300-1,400 g). The adult human brain is about 2 % of the TOTAL BODY weight. A newborn human baby brain weight approximately 350 to 400 grams.Human Brain Facts:The brain is much more active at night than during the day.Our Brain has over 100 billion nerve cells.The human brain can read up to 1,000 words per minute.The Human brain stops growing at the age of 18.The weight of the human cerebellum is 150g.The width of an average human brain is 140 mm.