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How Big Is a Flea?

A flea is about 0.098 in (2.5 mm) long. That is about 684 times smaller than the average man. A tiny jumping insect.

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How big is a flea compared to the average man?

A flea is about 684 times smaller than the average man. The average man is 684× the size of a flea: about 684 fleas stacked up would match it.

Flea size facts

Fleas are about 1.5 to 3.3 mm long.
A flea can jump about 18 cm high, roughly 70 times its own length.

How does a flea compare to other things?

A flea next to 25 things of similar size, plus some everyday references:

Thing	Size	Compared to Flea
Sun	865,000 miles (1,393,000 km) across	557 billion× bigger
Earth	7,920 miles (12,740 km) across	5.1 billion× bigger
Mount Everest	5.5 miles (8.849 km)	3.54 million× bigger
Eiffel Tower	1,083 ft (330 m)	132,000× bigger
School bus	40 ft (12.2 m) long	4,880× bigger
Average man (world)	5 ft 7 in (171 cm)	684× bigger
Average woman (world)	5 ft 3 in (159 cm)	636× bigger
Smartphone	5.8 in (14.7 cm)	58.8× bigger
Monarch butterfly	3.9 in (10 cm) long	40× bigger
Credit card	3.4 in (8.56 cm) long	34.2× bigger
Apple	3.1 in (8 cm) long	32× bigger
Baseball	2.9 in (7.4 cm) across	29.6× bigger
Tennis ball	2.6 in (6.7 cm) across	26.8× bigger
Wolf spider	2.4 in (6 cm) long	24× bigger
Bee hummingbird	2.2 in (5.5 cm) long	22× bigger
Golf ball	1.7 in (4.27 cm) across	17.1× bigger
US quarter	0.96 in (2.43 cm) across	9.7× bigger
Honeybee	0.59 in (1.5 cm) long	6× bigger
Ladybug	0.28 in (7 mm) long	0.18 in (4.5 mm) bigger
Grain of rice	0.26 in (6.5 mm) long	0.16 in (4 mm) bigger
Ant	0.16 in (4 mm) long	0.059 in (1.5 mm) bigger
Mustard seed	0.059 in (1.5 mm) across	0.039 in (1 mm) smaller
Grain of sand	0.02 in (500 µm) long	5× smaller
Dust mite	0.012 in (300 µm) long	8.3× smaller
Human hair (width)	70 µm across	35.7× smaller

Where do these numbers come from?

Sizes are typical adult or reported values, rounded for readability. Read how we measure and compare sizes.

Silhouettes from PhyloPic: Flea by T. Michael Keesey. See credits.