Human Brain Facts

How much does human brain weigh? Or what are the average dimensions of the adult brain. Here are some interesting facts about human brains.

• Average dimensions of the adult brain: Width = 140 mm/5.5 in, Length = 167 mm/6.5 in, Height = 93 mm/3.6 in.

• How much does human brain weigh? At birth our brains weigh and average of 350-400g (about 4/5 lbs), as adults the brain averages 1300-1400g (about 3 lbs).

• If stretched out the cerebral cortex would be 0.23 sq. m (2.5sq.ft), the area of a night table.

• Total surface area of the cerebral cortex is 2,500 cm2 or 2.69 sq.ft.

• The composition of the brain = 77-78% water, 10-12% lipids, 8% protein, 1% carbs, 2% soluble organics, 1% inorganic salt.

• The cerebellum contains half of all the neurons in the brain but comprises only 10% of the brain.

• The cerebral cortex is about 85% of the brain.

• There are about 100 billion neurons in the human brain, the same number of stars in our galaxy.

• The left hemisphere of the brain has 186 million more neurons than the right hemisphere.

• 750-1000ml of blood flow through the brain every minute or about 3 full soda cans.

• In that minute the brain will consume 46cm3 (1/5 cups) of oxygen from that blood.

• Your brain is about 2% of your total body weight but uses 20% of your body's energy.

• The energy used by the brain is enough to light a 25 watt bulb.

Interested in knowing more about brain, read here.