Calculations for the Aquarium Weights

Weight of water is 8.34 pounds per gallon.  (Assuming pure H2O 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

(This is a conversion from standard US aquarium sizes and may not represent standard European aquarium sizes)

English units

metric units

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

 

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