Carpenter ants are one of the biggest of all ant species. Carpenter ants have polymorphic workers, meaning that ants within a single colony may differ in size. Adult carpenter ants can gauge from 6 to 12 millimeters in length. Males, or winged swarmers, can measure up to 18 millimeters, while queens grow up to 20 millimeters, or one inch, in length.

An adult colony can contain three to four thousand adult ants. Like other ant species, carpenter ants are social insects, and their colonies are comprised of very different castes. A classic parent colony contains a queen, the queen’s brood, and workers, both minor and major. The size of worker carpenter ants determines their responsibilities. Minor workers are the smallest members of colony, and their tasks are to take care of the young and forage for food. Major workers are larger and serve as soldiers to defend against the predators.

In the United States, there are more than a dozen common species of ant. The Florida carpenter ant and the black carpenter ant are two of the main common species. While they may have similar physical characteristics, nesting habits, feeding and destructive behaviors, their colonies contain very different carpenter ant sizes. Mainly two factors affect the difference in size between species: the availability of food and the number of workers foraging for the food.

The Florida carpenter ant’s size varies from 3/16-inch to one inch. The Florida carpenter ant worker measures only 3/16 to 3/8-inch, while the queens are bigger, measuring over half an inch. Every colony of Florida carpenter ants contains over 3,000 workers.

The black carpenter ant’s size also depends on the caste. Worker ants may be as small as 1/4-inch, while queen ants can be bigger than 1/2-inch. In every species of carpenter ant, queens grow to be twice the size of worker ants.

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