Aquarium Volume Calculator & Fish Tank Dimensions

Aquarium Volume Calculator

There are various reasons you might want or need to use an aquarium volume calculator:

  • Determine the true volume of a custom aquarium 
  • Find the true volume of an off-the-shelf fish tank
  • Decide the necessary dimensions of a custom tank install
  • Help in selecting an appropriate equipment such as:
    • Return Pumps
    • Sump Size
    • Reactor Flow
    • Skimmer Size
    • etc.

Rectangular Aquarium Volume Calculator

Cylindrical Aquarium Volume Calculator

Uniquely shaped aquariums will require a bit of thinking to sort out. A bow front for instance, can be calculated by measuring the rectangular section first. Next measure the bow front section as if it were rectangular and divide by two.

Common Fish Tank Dimensions

While we can’t obviously cover every possible aquarium, this is a fair comprehensive list of typical tank sizes. These dimensions should be able to be a very helpful guide for designing your next setup or making changes to your existing one.

2.5 gal
(12″ x 6″ x 8″)


5.5 gal
(16″ x 8″ x 10″) 


10 gal
(20″ x 10″ x 12″) 


15 gal
(24″ x 12″ x 12″)


16 gal high
(20″ x 10″ x 18″) 

20 gal high
(24″ x 12″ x 16″) 


20 gal long
(30″ x 12″ x 12″)


29 gal
(30″ x 12″ x 18″) 


30 gal
(36″ x 13″ x 16″) 


37 gal
(30″ x 12″ x 22″) 


40 gal breeder
(36″ x 18″ x 16″) 


40 gal high
(36″ x 12″ x 21″)


53 gal
(36″ x 18″ x 21″) 


55 gal
(48″ x 13″ x 20″) 


60 gal
(48″ x 13″ x 24″) 


65 gal
(36″ x 18″ x 24″) 


75 gal
(48″ x 18″ x 21″) 


90 gal
(48″ x 18″ x 24″) 


110 gal
(48″ x 18″ x 30″) 


120 gal
(48″ x 24″ x 24″) 


120 gal X-high
(60″ x 18″ x 26″) 


125 gal
(72″ x 18″ x 22″) 


150 gal
(72″ x 18″ x 27″) 


150 gal X-high
(48″ x 24″ x 31″) 


180 gal wide
(72″ x 24″ x 24″) 


220 gal wide
(72″ x 24″ x 30″) 


265 gal
(84″ x 24″ x 30″)

2.5 Gallon

12″ x 6″ x 8″

5.5 Gallon

16″ x 8″ x 10″

10 Gallon

20″ x 10″ x 12″

15 Gallon

24″ x 12″ x 12″

16 Gallon High

20″ x 10″ x 18″

20 Gallon High

24″ x 12″ x 16″

20 Gallon Long

30″ x 12″ x 12″

29 Gallon

30″ x 12″ x 18″

40 Gallon Breeder

36″ x 18″ x 16″

40 Gallon High

36″ x 12″ x 21″

53 Gallon

36″ x 18″ x 21″

55 Gallon

48″ x 13″ x 20″

60 Gallon

48″ x 13″ x 24″

65 Gallon

36″ x 18″ x 24″

75 Gallon

48″ x 18″ x 21″

90 Gallon

48″ x 18″ x 24″

110 Gallon

48″ x 18″ x 30″

120 Gallon

48″ x 24″ x 24″

120 Gallon Extra High

48″ x 18″ x 30″

125 Gallon

72″ x 18″ x 22″

150 Gallon

72″ x 18″ x 27″

150 Gallon Extra High

48″ x 24″ x 31″

180 Gallon Extra Wide

72″ x 24″ x 24″

220 Gallon Extra Wide

72″ x 24″ x 30″

265 Gallon

84″ x 24″ x 30″

In Conclusion

These aquarium volume calculators and fish tank dimensions hopefully will prove helpful in selecting appropriately sized equipment. Knowing a more accurate volume for your aquarium will provide more accurate results with your reef.

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