55 Gallon 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 | 48 in |
| Width | 13 in |
| Height | 21 in |
| Geometric capacity | 56.7 gal |
| Nominal rating | 55 gal |
| Liquid weight (brim-full) | 473 lb of water |
| Empty tank weight | Varies by gauge/manufacturer — see nameplate or spec sheet |
Source
Standard North American aquarium trade dimensions (48 x 13 x 21 in exterior-nominal).. Capacity figures are computed from this geometry with exact partial-fill math — see methodology.
FAQ
What are the dimensions of a 55 gallon aquarium?
48″ × 13″ × 21″ — full table above. Source: Standard North American aquarium trade dimensions (48 x 13 x 21 in exterior-nominal)..
How much does a full 55 gallon aquarium weigh?
About 473 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.