How quickly does hair grow?

On average, human hair grows a small amount each day. Listen in as Marshall Brain explains hair growth in this podcast from HowStuffWorks.com.

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Episode Transcript

Speaker 1 (00:00):
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dot com. That's m o z Y dot com. Welcome
to brain Stuff from how Stuff works dot com where
smart happens. Hi, I'm Marshall Brain with today's question, how

(00:31):
quickly does hair grow? The answer is it depends. If
you just got a really bad haircut, it doesn't seem
to grow at all. But ignoring these perceptual differences, human
hair seems to grow at a pretty consistent rate of
about half a millimeter per day, or about half an
inch every month. It may grow faster or slower depending

(00:51):
on your age, your genetics, and your hormonal state. For example,
pregnancy seems to have an effect on hair, but half
a millimeter per a is a good average. What this
means is that the maximum growth rate for hair is
about six inches per year. If you have short hair
and you're thinking it sure would be nice to have
hair down to my waist, then you're gonna have to

(01:13):
wait five or six years for more on this and
thousands of other topics. Is it How stuff works dot Com?
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(01:36):
today at m o z y dot com