Below are some rough guidelines as to what to expect when looking at aquariums and empty vs full weight. The weights are an estimate because the amount of rock, thickness of glass and type of water all effect the weight calculations. A gallon of freshwater at a specific gravity of 1.000 weighs 8.34lbs. 1 gallon of water 8.34lbs times the specific gravity of say 1.025 equals 8.5485lbs (8.43 x 1.025 = 8.5485) The weight of the water will increase directly proportionate to the weight of the salt being dissolved in the water. 1 gallon of saltwater at 1.025 equals 8.54 lbs.
| SMALL AQUARIUMS |
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| Tank Size | L x W x H | Empty Weight | Filled Weight |
| 2 1/2 gallon | 12" x 6" x 8" | 3 lbs | 27 lbs |
| 5 gallon | 16" x 8" x 10" | 7 lbs | 62 lbs |
| 10 gallon "Leader" | 20" x 10" x 12" | 11 lbs | 111 lbs |
| 15 gallon | 24" x 12" x 12" | 21 lbs | 170 lbs |
| 15 gallon High | 20" x 10" x 18" | 22 lbs | 170 lbs |
MID-SIZED AQUARIUMS |
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| Tank Size | L x W x H | Empty Weight | Filled Weight |
| 20 gallon High | 24" x 12" x 16" | 25 lbs | 225 lbs |
| 20 gallon Long | 30" x 12" x 12" | 25 lbs | 225 lbs |
| 25 gallon | 24" x 12" x 20" | 32 lbs | 282 lbs |
| 29 gallon | 30" x 12" x 18" | 40 lbs | 330 lbs |
| 30 gallon Breeder | 36" x 18" x 12" | 48 lbs | 348 lbs |
| 40 gallon Breeder | 36" x 18" x 16" | 58 lbs | 458 lbs |
| 40 gallon Long | 48" x 12" x 16" | 55 lbs | 455 lbs |
LARGE AQUARIUMS |
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| Tank Size | L x W x H | Empty Weight | Filled Weight |
| 50 gallon | 36" x 18" x 19" | 100 lbs | 600 lbs |
| 55 gallon | 48" x 13" x 21" | 78 lbs | 625 lbs |
| 65 gallon | 36" x 18" x 24" | 126 lbs | 772 lbs |
| 75 gallon | 48" x 18" x 21" | 140 lbs | 850 lbs |
| 90 gallon | 48" x 18" x 24" | 160 lbs | 1050 lbs |
| 125 gallon | 72" x 18" x 21" | 206 lbs | 1206 lbs |
| 150 gallon | 72" x 18" x 28" | 338 lbs | 1838 lbs |
| 180 Gallon | 72" x 24" x 25" | 430 lbs | 1870 lbs |
| 225 Gallon | 72" x 27.5" x 27.5" | 358 lbs | 2158 lbs |