Standard Aquarium Sizes

Basic Aquarium Sizes (US Units of Weight & Measure)

Note: Weights are for glass aquariums, acrylic will weigh less

SMALL AQUARIUMS (not recommended for beginners)
Tank Size	L x W x H	Filled Weight
2 1/2 gallon	12" x 6" x 8"	27 lbs
5 gallon	16" x 8" x 10"	62 lbs
10 gallon "Leader"	20" x 10" x 12"	111 lbs
15 gallon	24" x 12" x 12"	170 lbs
15 gallon High	20" x 10" x 18"	170 lbs
MID-SIZED AQUARIUMS
Tank Size	L x W x H	Filled Weight
20 gallon High	24" x 12" x 16"	225 lbs
20 gallon Long	30" x 12" x 12"	225 lbs
25 gallon	24" x 12" x 20"	282 lbs
29 gallon	30" x 12" x 18"	330 lbs
30 gallon Breeder	36" x 18" x 12"	348 lbs
40 gallon Breeder	36" x 18" x 16"	458 lbs
40 gallon Long	48" x 12" x 16"	455 lbs
LARGE AQUARIUMS
Tank Size	L x W x H	Filled Weight
50 gallon	36" x 18" x 19"	600 lbs
55 gallon	48" x 13" x 21"	625 lbs
65 gallon	36" x 18" x 24"	772 lbs
75 gallon	48" x 18" x 21"	850 lbs
90 gallon	48" x 18" x 24"	1050 lbs
125 gallon	72" x 18" x 21"	1400 lbs
150 gallon	72" x 18" x 28"	1800 lbs
180 Gallon	72" x 24" x 25"	2100 lbs

copied directly from:

http://freshaquarium.about.com/od/aquariumsandstands/a/tanksizesweights.htm