Body · #983 biggest of 1,014
How big is a human hair (width)?
70 µm
A human hair (width) measures 70 µm. That's about 9.33 red blood cells lined up end to end.
By the numbers
- That's 70 micrometers (µm) — far too small to see with the naked eye.
- You'd need about 24,286 of them stacked up to reach the height of an average adult.
- Roughly 9.33 red blood cells could line up across it.
- Out of all 1,014 things in this collection, it ranks #983 by size.
Size comparison
How human hair (width) stacks up against things of a similar size. Tap any bar to explore it.
grain of salt
3.0e+2 µm
human egg cell
1.0e+2 µm
neuron
1.0e+2 µm
circuit trace
1.0e+2 µm
human hair (width)
70 µm
human hair (width)
70 µm
pixel on a phone screen
60 µm
sperm cell
50 µm
dust particle
50 µm
Bars use a logarithmic scale so everything fits — real differences are even more extreme!
Fun fact
It's so small that about 14 of them would fit across a single millimeter.
More in Body
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