All things · Under the Microscope

Platelet: how big is it?

Platelet is about 2.5 µm. In everyday terms, that is ≈ 23,600 hydrogen atoms.

Size

2.5 µm

In metres

2.50 × 10⁻⁶ m

Everyday comparison

≈ 23,600 hydrogen atoms

Chapter

Under the Microscope

Did you know?

Tiny cell fragments that rush to plug a cut and help your blood clot.

How it compares

• About 1.3× bigger than E. coli bacterium (2 µm).
• About 3× smaller than Red blood cell (7.5 µm).

Other things of a similar size

• Wavelength of green light 530 nm
• Mimivirus 750 nm
• E. coli bacterium 2 µm
• Red blood cell 7.5 µm
• White blood cell 12 µm
• Skin cell 30 µm

Sizes are rounded, typical values drawn from standard reference sources, including NIST/CODATA physical constants and NASA's planetary fact sheets. Real objects vary; see About for how sizes are chosen.