All things · Small Wonders

Flea: how big is it?

Flea is about 2.5 mm. In everyday terms, that is ≈ 35.7 human hairs (width).

Size

2.5 mm

In metres

2.50 × 10⁻³ m

Everyday comparison

≈ 35.7 human hairs (width)

Chapter

Small Wonders

Did you know?

Fleas can leap more than 50 times their own body length.

How it compares

• About 1.7× bigger than Mustard seed (1.5 mm).
• About 2× smaller than Ant (5 mm).

Other things of a similar size

• Tardigrade 450 µm
• Grain of sand 600 µm
• Mustard seed 1.5 mm
• Ant 5 mm
• Grain of rice 7 mm
• Honeybee 1.5 cm

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.