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In a person weighing 150 pounds, the weight of the brain makes up approximately two percent of the person's weight. The average brain weighs between 1,300 and 1,400 grams in an adult and 300 to 400 grams in a newborn.

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9y ago
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15y ago

In humans, about 2% on average.

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15y ago

2%

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Wiki User

11y ago

25%

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Wiki User

14y ago

i think 10%

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Q: What percentage of the body does the brain use?
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