Diameter120 millionths m
1 hundredthsUSB plug widths
12 millionHard X-ray wavelengths
52.2 millionthsPorta-potty heights
About 120 micrometers; visible to the naked eye
Photo from Wikimedia Commons
Human Egg Cell
The largest cell in the human body, visible to the naked eye/The Human Body
The human ovum (egg cell) is the largest cell in the body, with a diameter of about 120 micrometers, just barely visible to the unaided eye as a tiny dot. It weighs roughly 3.5 micrograms, which makes it about a million times heavier than a sperm cell. A person with ovaries is born with all the eggs they'll ever have, roughly 1-2 million at birth, declining to about 300,000 by puberty.
Measurements
Mass3.5 billionths kg
636 septillionthsTeaspoons of neutron star
778 quadrillionthsAmbulances
304 billionthsAAA batteries
About 3.5 micrograms
Volume905 quadrillionths m³
181 billionthsCough syrup doses
348 sextillionthsGreat Pyramid volumes
362 quintillionthsOlympic pools
Roughly 0.9 nanoliters, assuming a sphere
Zona pellucida thickness13 millionths m
108 millionthsCandy bar lengths
1.6 thousandthsLadybugs
1.3 tenthsPaper thicknesses
The protective glycoprotein shell, about 13 μm
Surface area45.2 billionths m²
181 billionthsMonopoly boards
6.3 trillionthsFIFA soccer pitches
About 45,200 μm²
Ovulation cycle2.4 million s
1.9 tenthsSemesters
767Microcenturies
About 28 days per cycle