Aquarium size and dimension

Here is a handy reference chart that lists most Standard Aquarium sizes with their dimensions.

Standard Rectangular Tanks
Volume in Gallons	Dimensions in Inches (L x W x H)
2.5 Mini Tank	12 x 6 x 8
5.5	16 x 8 x 10
10	20 x 10 x 12
15	24 x 12 x 12
15 High	20 x 10 x 18
16 High	20 x 10 x 19
20 High	24 x 12 x 16
20 Long	30 x 12 x 12
20 Extra High	20 x 10 x 24
25	24 x 12 x 20
29	30 x 12 x 18
30	36 x 12 x 16
30 Extra High	24 x 12 x 24
30 Breeder	36 x 18 x 12
33 Long	48 x 13 x 12
37	30 x 12 x 22
37 (Oceanic)	24.5 x 18.5 x 21
37 Column	20 x 18 x 24
38	36 x 12 x 20
40 Breeder	36 x 18 x 16
40 Long	48 x 13 x 16
45	36 x 12 x 24
50	36 x 18 x 18
50 (Oceanic)	30.5 x 18.5 x 21
55	48 x 13 x 20
58	36 x 18 x 21
65	36 x 18 x 24
70	36 x 18 x 25
75	48 x 18 x 21
90	48 x 18 x 24
105	48 x 18 x 29
110 (Oceanic)	60 x 18 x 23
110 Extra High	48 x 18 x 30
120 High	48 x 24 x 24
120 Long	60 x 18 x 26
125	72 x 18 x 22
150	72 x 18 x 28
150 Extra High	48 x 24 x 30
180	72 x 24 x 24
210	72 x 24 x 29
220	72 x 24 x 30
265	84 x 24 x 30
Bowfront Tanks
Volume in Gallons	Dimensions in Inches (L x W x H)
26 Bowfront	24 x 15 x 21
28 Bowfront	24 x 16 x 18
36 Bowfront	30 x 15 x 21
46 Bowfront	36 x 15 x 20
72 Bowfront	48 x 18 x 22
90 Bowfront	48 x 18 x 29
155 Bowfront	72 x 24 x 24
175 Bowfront	72 x 24 x 29
Corner Tanks
Volume in Gallons	Dimensions in Inches (L x W x H)
54 Corner	38 x 27 x 22
70 Corner	48 x 22 x 25
92 Corner	48 x 34 x 24
Hexagon Tanks
Volume in Gallons	Dimensions in Inches (L x W x H)
10 Hexagon	14 x 12 x 18
14 Hexagon	14 x 14 x 20
20 Hexagon	18 x 16 x 20
23 Flatback Hexagon	24 x 12 x 14
27 Hexagon	18 x 18 x 24
33 Flatback Hexagon	36 x 12 x 16
35 Hexagon	23 x 20 x 24
44 Pentagon	22 x 22 x 24
52 Flatback Hexagon	48 x 13 x 20
60 Hexagon	27 x 24 x 28

source: http://ovas.ca