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How big is an Ant?

4 millimetres!

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Ant

An ant is an insect that lives in a colony, where a queen lays the eggs and workers do the other jobs. The explorer shows a worker ant 4 millimeters (0.16 inches) long. That is a typical size for an ant worker, measured along its body without the legs and antennae.

Size

An ant's body length runs from the front of its head, through the middle section, which carries the legs, and the narrow waist, to the tip of its abdomen. GlobalAnts, a database of ant measurements collected at sites around the world, gives an average worker length of 3.6 millimeters across hundreds of species. Half of those species have workers shorter than about 3 millimeters.

The full range is much wider. The smallest known workers, in the genus Carebara, are 0.8–1.0 millimeters long. The longest known workers belong to the giant bulldog ant of Australia, Myrmecia brevinoda, and reach 37 millimeters. Queens can be larger still: as of 2026, Guinness World Records lists the queen of the fulvous driver ant, Dorylus fulvus of South Africa, as the largest ant, at up to 5 centimeters (2 inches) long.

Size can also vary inside a single colony. In about 15 percent of ant species, workers come in very different sizes, often matched to different tasks. Workers of the fire ant Solenopsis megergates, for example, range from about 3.0 to 6.9 millimeters long.

Size comparisons

  • About five 4-millimeter ants lined up head to tail would span a U.S. penny, which is 19 millimeters (0.75 inches) across.
  • An ant this size is about as long as a grain of short-grain rice, and a little over half as long as a grain of long-grain rice, which is 6–8 millimeters long.
  • The longest worker ants are about nine times as long as a 4-millimeter worker, and the smallest are one-quarter to one-fifth as long.
  • If an ant were enlarged to the height of a person 1.7 meters (5 feet 7 inches) tall, a penny on the same scale would be about 8 meters (27 feet) across.

How many ants there are

A 2022 study combined the results of 489 earlier studies from every continent where ants live. It estimated that about 20 quadrillion ants are alive at any one time. That is 2 × 1016, a 2 followed by 16 zeros. The authors call the figure conservative, because some habitats, such as boreal forests and everything underground, had too little data to include.

Together, the dry bodies of all those ants hold about 12 million metric tons of carbon. That is more than all wild birds and wild mammals combined, and about one-fifth of the amount in all humans. More than 15,700 species and subspecies of ants have been named, and there may be as many again that scientists have not yet described.

Queens, workers and flying ants

Worker ants are always female. The black garden ant, Lasius niger, a common ant of gardens in Britain, shows how a colony works. A single colony may hold as many as 15,000 ants. Its wingless workers, about 3 millimeters long, gather food and care for the young, while the queen produces the eggs.

In hot, humid summer weather, winged adults appear and swarm in large numbers. These "flying ants" are larger than the workers. They mate, then spread out to start new colonies.

Sources

Scale of the Universe > Ant
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Amoeba
Amoebae are unicellular, which means there is only one cell. Some amoebae can grow to an incredible 700 micrometers, which is almost an entire millimeter.
Sleet
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Sunflower Seed
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