Hair
A hair is a slender strand of protein that grows from the skin of humans and other mammals.
How big is it?
70 µm across
Also 0.002756 in
Diameter · example
A little perspective
Hair vs Sheet of paper: length comparison
The thickness of a sheet of paper is about 1.43 times the diameter of a hair.
A hair is a slender strand of protein that grows from the skin of humans and other mammals.
A sheet of paper is a flat material made from cellulose pulp, used for writing, printing or packaging.
Both rulers start at the same zero and share one linear scale. Artwork keeps its original proportions. Horizontal rulers compare the selected spans; vertical brackets also identify height on the artwork.
Measurements, assumptions & sources +
Hair
Diameter: 70 µm; example.
A 70 µm diameter example; hair thickness varies.
Defined examples — our methodology
The marked diameter is calibrated. Unmeasured illustration details are representative.
Sheet of paper
Thickness: 100 µm; example.
A 0.1 mm thick sheet. Paper stock and compression change thickness.
Defined examples — our methodology
The marked thickness is calibrated. Unmeasured illustration details are representative.
Use the visual comparison to explore its scale, then check the measurements and sources.
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Why this measurement?
Why we use 70 µm
We compare the diameter of a hair. This is an illustrative comparison value, not a claim that every example is the same.
A 70 µm diameter example; hair thickness varies.
The marked vertical span follows the measured feature, not the edges of the image. How calibrated comparisons work →
Recorded properties
Dimensions and measurements
| Property | Selected value | Recorded range | Basis |
|---|---|---|---|
| 70 µm | Not recorded | example |
Around this scale
Explore nearby values.
Compare examples with lower, similar and higher values. Each card names the measurement being compared.
Nearest lower valuePeople and human anatomySperm cell50 µmRepresentative head-to-tail lengthA sperm cell is a male reproductive cell with a compact head, energy-producing midpiece and a flagellum used for movement.
Nearest higher valueEveryday objectsSheet of paper100 µmThicknessA sheet of paper is a flat material made from cellulose pulp, used for writing, printing or packaging.Sources and method
Want to check the number?
The source records and measurement method remain available for inspection.
More ways to see it
Curated comparisons
There’s always another scale
Follow your curiosity.
Everyday thingsSheet of paper100 µmA sheet of paper is a flat material made from cellulose pulp, used for writing, printing or packaging.
MicroscopicPollen grain30 µmA pollen grain carries the male reproductive cells of a seed-producing plant.
MicroscopicSalt crystal300 µmA salt crystal is a small, naturally occurring or manufactured piece of sodium chloride used in food and industry.PeopleSperm cell50 µmA sperm cell is a male reproductive cell with a compact head, energy-producing midpiece and a flagellum used for movement.
MicroscopicDust particle10 µmDust is a mixture of tiny solid particles from sources such as soil, fibres, skin and pollen.
Living thingsPoppy seed1 mmA poppy seed is an edible seed produced by plants in the poppy family and commonly used in breads and other foods.
MicroscopicCell10 µmA cell is the basic structural unit of living organisms.
MicroscopicRed blood cell7.5 µmA red blood cell is a specialised blood cell that transports oxygen using haemoglobin.A closer look