Calculations for the Aquarium Weights
Weight of water is 8.34 pounds per gallon. (Assuming pure H_{2}O at sea level)
Density of any material is defined as the weight per unit volume.
Density of water is 62.4 pounds per cubic foot (pcf)
Density of rock varies approximately as follows: Granite = 175 pcf, Limestone = 165 pcf, Sandstone = 147 pcf, Shale = 170 pcf
There is the weight of the water, the aquarium itself and the weight of the rocks and substrate and stand. You know that the density (weight per unit volume) of rock is greater than the density of water. That's why the rock doesn't float. Depending upon the rock that you use, the density might vary from 120 pounds per cubic ft (pcf) to 180 pcf. The all-glass web site says that a 125 gallon tank weighs 206 lbs (empty) and the total estimated weight of a full aquarium is around 1400 lbs. Let's say that you are adding 210 lbs of limestone rock and gravel to a tank. The density of limestone is around 140 pcf. If this was a solid rock it should be around (210 lb/140 pcf = )1 1/2 cubic ft in size. If it were all gravel it would not all fit into a 1 1/2 cubic ft box but that is because there are lots of pockets of air in that cube of gravel. So 210 pounds of limestone whether solid or gravel should displace about 1 1/2 cubic ft of water. The "bouyant weight" of rock is the weight of the rock minus the weight of the water that it displaces. So this rock has added about (1.5)(140-62.4) = 116 pounds to the aquarium weight. The water in the aquarium weighs (125)(8.34) - (1.5)(62.4) = 950 pounds. So if that aquarium stand weighs 44 pounds, then this is how this works out. Total weight = 206 lb (tank) + 950 lb (water) + 210 lb (rocks) + 44 lb (stand) = 1400 lbs. (Note that since I subtracted out the volume of water that is displaced by the rock, I
4 ft (123 cm) long aquariums |
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(This is a conversion from standard US aquarium sizes and may not represent standard European aquarium sizes) |
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English units |
metric units |
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US gallons |
UK gallons |
dimensions |
weight |
liters |
dimensions |
weight |
33 long |
27.5 |
48 1/4" x 12 3/4" x 13 3/8" |
382 lb |
125 liter |
123 cm x 32 cm x 34 cm |
173 kg |
40 long |
33 |
48 1/4" x 12 3/4" x 16 7/8" |
455 lb |
151 liter |
123 cm x 32 cm x 43 cm |
206 kg |
45 long |
37.5 |
48 1/4" x 12 3/4" x 19" |
510 lb |
170 liter |
123 cm x 32 cm x 48 cm |
231 kg |
55 gallon |
46 |
48 1/4" x 12 3/4" x 21" |
625 lb |
208 liter |
123 cm x 32 cm x 53 cm |
284 kg |
60 gallon |
50 |
48 3/8" x 12 7/8" x 23 7/8" |
710 lb |
227 liter |
123 cm x 33 cm x 59 cm |
322 kg |
75 gallon |
62.5 |
48 1/2" x 18 1/2" x 21 1/8" |
785 lb |
284 liter |
123 cm x 47 cm x 54 cm |
356 kg |
80 X-high |
66.5 |
48 7/8" x 14" x 30 3/4" |
990 lb |
303 liter |
124 cm x 36 cm x 78 cm |
449 kg |
90 gallon |
75 |
48 1/2" x 18 1/2" x 25 5/8" |
1050 lb |
341 liter |
123 cm x 47 cm x 65 cm |
476 kg |
110 X-high |
91.5 |
48 1/2" x 18 1/2" x 30 1/2" |
1320 lb |
416 liter |
123 cm x 47 cm x 78 cm |
599 kg |
120 gallon |
100 |
48 1/2" x 24 1/2" x 25 1/2" |
1400 lb |
454 liter |
123 cm x 62 cm x 65 cm |
635 kg |
150 X-high |
125 |
48 1/2" x 24 1/2" x 30 1/2" |
1800 lb |
568 liter |
123 cm x 62 cm x 78 cm |
817 kg |
This site give you a list of common tank sizes and approx total weights=>
http://www.alysta.com/books/fishtank.htm or http://www.all-glass.com/services/techinfo.shtml