How big are flea eggs?

Picture of a cat flea egg on finger. Humans can see flea eggs.

Denni Schnapp

Img 1 Cat flea eggs on the tip of a human finger.


Cat flea eggs are 0.5 millimeters long, and 0.3 millimeters wide. Though tiny, they’re still big enough to be visible to the unaided eye.


Flea Eggs Size

Eggs of the cat flea, Ctenocephalides felis, are very small. They measure approximately 0.5 millimeters in length, and 0.3 millimeters in width. Though minuscule in size, they’re still large enough to be seen by the human eye.

Size Comparisons

For comparison, the tip of a sharp #2 pencil is approximately 1 mm, some mechanical pencils have 0.5 mm lead, and a grain of table salt is around 0.3 x 0.3 mm. Consequently, the white eggs are often described as looking like grains of salt.

illustration of cat flea egg size


Img 2 Size of a cat flea egg compared to the tip of a sharp #2 pencil (1 mm).


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