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How many pieces of hair grow on your head every year?

Lydia Davey from Carmarthenshire
Age 5-14 (Humanity Big Questions)

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One Response

  1. Human hair seems to grow at a pretty consistent rate of about half a millimeter or so per day, or about half an inch every month . It may grow faster or slower depending on your age, your genetics and your hormonal state (pregnancy seems to have an affect on hair), but half a millimeter per day is a good average.

    What this means is that the maximum growth rate for hair is about 6 inches (15 cm) per year.

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