Standard Aquarium Tank Sizes: Dimensions, Volume & Weight
22 standard US aquarium sizes from 2.5 to 180 gallons, with published external dimensions, nominal and usable water volume, and estimated full-tank water weight for each. Every figure on this page also drives a machine-readable file at /data/tank-sizes.json. Compiled 2026-09-25.
2.5 Gallon12×6×8 in · 0 L usable5.5 Gallon16×8×10 in · 3.7 L usable10 Gallon20×10×12 in · 19.1 L usable15 Gallon24×12×12 in · 36.1 L usable20 Gallon Long30×12×12 in · 53.1 L usable20 Gallon High24×12×16 in · 53.1 L usable20 Gallon Extra High20×10×24 in · 53.1 L usable29 Gallon30×12×18 in · 83.8 L usable30 Gallon Breeder36×18×12 in · 87.2 L usable30 Gallon Long36×12×16 in · 87.2 L usable33 Gallon Long48×13×12 in · 97.4 L usable37 Gallon30×12×22 in · 111.1 L usable38 Gallon36×12×20 in · 114.5 L usable40 Gallon Breeder36×18×16 in · 121.3 L usable40 Gallon Long48×12×16 in · 121.3 L usable50 Gallon36×18×19 in · 155.3 L usable55 Gallon48×13×21 in · 172.4 L usable75 Gallon48×18×21 in · 240.5 L usable90 Gallon48×18×24 in · 291.6 L usable125 Gallon72×18×22 in · 410.9 L usable150 Gallon72×18×28 in · 496 L usable180 Gallon72×24×25 in · 598.2 L usable
| Size | External dims (in) | Nominal volume (L) | Usable volume (L) | Full weight (lb) |
|---|---|---|---|---|
| 2.5 Gallon | 12×6×8 | 9.5 | 0 | 20.8 |
| 5.5 Gallon | 16×8×10 | 20.8 | 3.7 | 45.8 |
| 10 Gallon | 20×10×12 | 37.9 | 19.1 | 83.3 |
| 15 Gallon | 24×12×12 | 56.8 | 36.1 | 124.9 |
| 20 Gallon Long | 30×12×12 | 75.7 | 53.1 | 166.6 |
| 20 Gallon High | 24×12×16 | 75.7 | 53.1 | 166.6 |
| 20 Gallon Extra High | 20×10×24 | 75.7 | 53.1 | 166.6 |
| 29 Gallon | 30×12×18 | 109.8 | 83.8 | 241.5 |
| 30 Gallon Breeder | 36×18×12 | 113.6 | 87.2 | 249.8 |
| 30 Gallon Long | 36×12×16 | 113.6 | 87.2 | 249.8 |
| 33 Gallon Long | 48×13×12 | 124.9 | 97.4 | 274.8 |
| 37 Gallon | 30×12×22 | 140.1 | 111.1 | 308.1 |
| 38 Gallon | 36×12×20 | 143.8 | 114.5 | 316.5 |
| 40 Gallon Breeder | 36×18×16 | 151.4 | 121.3 | 333.1 |
| 40 Gallon Long | 48×12×16 | 151.4 | 121.3 | 333.1 |
| 50 Gallon | 36×18×19 | 189.3 | 155.3 | 416.4 |
| 55 Gallon | 48×13×21 | 208.2 | 172.4 | 458 |
| 75 Gallon | 48×18×21 | 283.9 | 240.5 | 624.6 |
| 90 Gallon | 48×18×24 | 340.7 | 291.6 | 749.5 |
| 125 Gallon | 72×18×22 | 473.2 | 410.9 | 1041 |
| 150 Gallon | 72×18×28 | 567.8 | 496 | 1249.2 |
| 180 Gallon | 72×24×25 | 681.4 | 598.2 | 1499 |