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Science · Guess the stat

How well do you know the human brain?

Guess the real numbers behind the human brain, see how everyone else guessed, and get the source.

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About how much does an average adult human brain weigh?

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Brain by the numbers

Real figures with their sources. All Brain facts →

~369 cm3 to ~961 cm3

How does brain volume at birth compare with brain volume after just one year of life?

A newborn's brain volume of about 369 cm3 grows to roughly 961 cm3 within the first year of life -- its fastest growth spurt.

Source: Giedd et al., via Wikipedia (2024) en.wikipedia.org

about 0.12 m2

If unfolded, about how large is the surface area of one hemisphere of the cerebral cortex?

Unfolded and flattened, one hemisphere of the cerebral cortex covers about 0.12 square meters -- all folded into a compact skull.

Source: Toro et al., via Wikipedia (2008) en.wikipedia.org

~1 quadrillion vs 100-500 trillion

About how many synapses does a 3-year-old child's brain have, compared with an adult's?

A 3-year-old's brain has about 1 quadrillion synapses, actually more than the 100 to 500 trillion typically found in an adult brain.

Source: Drachman (2005), via Wikipedia (2005) en.wikipedia.org

What people think about the human brain

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Which brain skill would you most want to improve?

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What do you think helps brain health the most?

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Are you a 'morning brain' or 'night brain' person?

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Questions

How does BrainSurvey.com work?

Each question asks you to guess a real number about the human brain. After you answer you see how everyone else guessed, then the real figure and where it comes from.

How is the daily round scored?

Four stats and one opinion poll. A correct guess earns 100 points plus up to 50 for speed, with a combo bonus for answers in a row. The range next to the right answer earns 40. Opinion polls earn 25 for having your say, and nailing every stat adds 150.

Where do the numbers come from?

Every stat links to its source, such as government statistics agencies, research organizations and industry groups. Figures are checked against the source before they go live.

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