CALCBIOME — ANT NEST SIZE

How big a nest for your colony?

Test tube or nest, area, chamber height and outworld: ballpark figures by worker size and number of workers.

TUBE OR NESTThe right time to move.
RIGHT SIZENot too small, not too big.
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Nest size: the basics

Tube first: a young colony does very well in a test tube (16 mm for most species). Move to a nest at about 100 workers for small species, about 50 for larger ones (Camponotus, Messor) and tiny ones (Temnothorax).
Not too big: ants dislike large empty spaces in the nest. The outworld, though, can be as big as you like.
Area: based on commercial nests, about 22–45 cm² of nest per 100 small workers, 45–100 cm² for large species.
Height: 5–10 mm for small species (Lasius), 10–14 mm for medium ones, 12–20 mm for Camponotus.
Expand: connect a new module when the nest is three-quarters full: the colony will spread on its own.

Suggested nest area

Workers	Small species (Lasius…)	Large (Camponotus…)
100	20–45 cm²	45–100 cm²
300	65–135 cm²	135–300 cm²
1000	220–450 cm²	450–1000 cm²
3000	660–1350 cm²	1350–3000 cm²

These are ballpark figures from keeper forums and the capacities of commercial nests.

How we calculate

Tube or nest: test tube up to ≈ 100 workers for small species, ≈ 50 for tiny, medium and large ones; nest beyond.
Nest size (outer footprint, cm²) = workers ÷ 100 × 22–45 (small), 33–64 (medium), 45–100 (large), 15–30 (tiny, estimated), rounded to 5 cm². These ranges come from 22 commercial nests with stated capacities. While the colony is in a tube, the figure is for the moving threshold.
Chamber height: 3–5 mm (tiny, estimated), 5–10 mm (small), 10–14 mm (medium), 12–20 mm (large).
Outworld = workers ÷ 100 × 150 to 400 cm² by size, at least 200 cm² (400 for harvesters): the minimum is sourced, the scaling is an estimate.

Example

300 Lasius niger (small): a nest, 65–135 cm² (for example about 12 × 8 cm), 5–10 mm chambers, and an outworld of at least 600 cm².

Sources: Formiculture forum (when to move to a nest, tubes and chambers, 16 mm tubes), Antstore forum, stated capacities of commercial nests (Esthetic Ants, Quality Ants, Ant Keepers, Ants Kingdom, Queen of Ants…). These are ballpark figures: watch your colony and adjust.

Frequently asked questions

When should I move from a test tube to a nest?

At about 100 workers for small species (Lasius), about 50 for Camponotus, Messor and Temnothorax, or sooner if the tube’s water runs low or the cotton moulds.

Is a nest that is too big a problem?

Yes: workers scatter, leave rubbish everywhere and mould appears. Better a slightly small nest, then expand.

What chamber height?

5–10 mm for small species, 10–14 mm for medium ones, 12–20 mm for Camponotus.

How big should the outworld be?

At least 20 × 10 cm for a small colony and 20 × 20 cm for harvesters; bigger is not a problem.

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