40 Gallon Breeder Aquarium dimensions
Rated sizes are brim-full nominal; real water volume is lower after substrate and the air gap — read the chart at your actual water line.
| Spec | Value |
|---|---|
| Length | 36 in |
| Width | 18 in |
| Height | 16 in |
| Geometric capacity | 44.9 gal |
| Nominal rating | 40 gal |
| Liquid weight (brim-full) | 375 lb of water |
| Empty tank weight | Varies by gauge/manufacturer — see nameplate or spec sheet |
Source
Standard North American aquarium trade dimensions (36 x 18 x 16 in exterior-nominal).. Capacity figures are computed from this geometry with exact partial-fill math — see methodology.
FAQ
What are the dimensions of a 40 gallon breeder aquarium?
36″ × 18″ × 16″ — full table above. Source: Standard North American aquarium trade dimensions (36 x 18 x 16 in exterior-nominal)..
How much does a full 40 gallon breeder aquarium weigh?
About 375 lb of water brim-full, plus the empty tank weight.
How accurate are these figures?
Dimensions come from the sources listed; capacity is computed from exact geometry and matches our chart pages. Rated sizes are brim-full nominal; real water volume is lower after substrate and the air gap — read the chart at your actual water line.