Are you in need of an overview chart that’s referencing the sizes and dimensions of all fish tanks? You may want to bookmark this page.

## Fish Tank Measurements With Standard Shapes

Firstly I will be listing the dimensions and gallon capacities of the most popular aquariums with a standard rectangular shape.

After that, I will list the branded tanks with irregular shapes and sizes.

Here are the dimensions and gallon sizes of all standard fish tanks:

### Small Standard Aquariums

You’d want to avoid getting a small tank if you’re a complete beginner in fish keeping.

Smaller tanks get polluted the quickest and it’s more difficult for a beginner to keep the water parameters in check.

Tank Size | Dimensions in Inches L x W x H |
Aquarium Shape |
---|---|---|

2.5 Gallon | 12.25 x 6.25 x 8.125 | Standard Rectangular |

5 Gallon | 16 x 8 x 10 | Standard Rectangular |

5.5 Gallon | 16.25 x 8.375 x 10.5 | Standard Rectangular |

10 Gallon Leader | 20.25 x 10.5 x 12.6 | Standard Rectangular |

10 Gallon Long | 24.25 x 8.5 x 12.6 | Standard Rectangular |

15 Gallon | 24.5 x 12.5 x 12.75 | Standard Rectangular |

15 Gallon Tall | 20.25 x 10.5 x 18.75 | Standard Rectangular |

15 Gallon Show | 24.25 x 8.5 x 16.6 | Standard Rectangular |

### Mid-Sized Standard Aquariums

If you’re a fish keeping beginner you’d want to start with a mid-sized tank as it’d be easier to manage.

I realize we all may have space and budget constraints but if you have the means to – go for a middle-sized aquarium.

Tank Size | Dimensions in Inches L x W x H |
Aquarium Shape |
---|---|---|

20 Gallon Tall | 24.25 x 12.5 x 16.75 | Standard Rectangular |

20 Gallon Long | 30.25 x 12.5 x 12.75 | Standard Rectangular |

20 Gallon Extra Tall | 20.25 x 10.5 x 23.75 | Standard Rectangular |

23 Gallon Long | 36.25 x 12.625 x 13 | Standard Rectangular |

25 Gallon | 24.25 x 12.5 x 20.75 | Standard Rectangular |

29 Gallon | 30.25 x 12.5 x 18.75 | Standard Rectangular |

30 Gallon | 36.25 x 12.625 x 16.75 | Standard Rectangular |

30 Gallon Breeder | 36.25 x 18.25 x 13 | Standard Rectangular |

30 Gallon Extra Tall | 24.25 x 12.5 x 24.75 | Standard Rectangular |

33 Gallon Long | 48.25 x 12.75 x 13.375 | Standard Rectangular |

37 Gallon | 30.25 x 12.5 x 22.75 | Standard Rectangular |

38 Gallon | 36.25 x 12.625 x 19.75 | Standard Rectangular |

40 Gallon Breeder | 36.25 x 18.25 x 17 | Standard Rectangular |

40 Gallon Long | 48.25 x 12.75 x 16.875 | Standard Rectangular |

45 Gallon | 36.5 x 12.625 x 23.75 | Standard Rectangular |

45 Gallon Long | 48.25 x 12.75 x 19 | Standard Rectangular |

### Large Standard Aquariums

Large tanks can be very rewarding if you do your homework.

Nothing compares to having a big ecosystem with lots of small schooling fish, turtles or monster fish at home.

Larger aquariums are also the most stable in terms of water parameters.

Tank Size | Dimensions in Inches L x W x H |
Aquarium Shape |
---|---|---|

50 Gallon | 36.375 x 18.375 x 19 | Standard Rectangular |

55 Gallon | 48.25 x 12.75 x 21 | Standard Rectangular |

60 Gallon | 48.375 x 12.875 x 23.875 | Standard Rectangular |

65 Gallon | 36.375 x 18.375 x 25 | Standard Rectangular |

75 Gallon | 48.5 x 18.5 x 21.25 | Standard Rectangular |

80 Gallon Extra Tall | 48.875 x 14 x 30.75 | Standard Rectangular |

90 Gallon | 48.5 x 18.5 x 24.375 | Standard Rectangular |

100 Gallon | 72.5 x 18.5 x 19.375 | Standard Rectangular |

110 Gallon Extra Tall | 48.875 x 19 x 30.75 | Standard Rectangular |

120 Gallon | 48.5 x 24.5 x 25.5 | Standard Rectangular |

125 Gallon | 72.5 x 18.5 x 21 | Standard Rectangular |

150 Gallon | 72.5 x 18.5 x 29.5 | Standard Rectangular |

180 Gallon | 72.5 x 24.5 x 25.625 | Standard Rectangular |

210 Gallon | 72.5 x 24.5 x 29.625 | Standard Rectangular |

225 Gallon | 72.5 x 27.5 x 27.5 | Standard Rectangular |

## Measurements of Brand Fish Tanks With Irregular Shapes and Sizes

Branded tanks don’t follow any rules about dimensions or gallon capacities.

They are mostly unique and the brand that makes the tank decides what its measurements would be.

Here are the dimensions of all irregularly-shaped aquarium kits:

### Small Branded Aquariums

Starting with the dimensions of the smallest branded tanks, this is probably the longest chart in this list.

That’s because many brands recognize that small tanks are the biggest revenue drivers (which is not a good thing, since as I said earlier, beginners should ideally start with a mid-sized tank).

Aquarium Kit | Dimensions in Inches L x W x H | Shape |
---|---|---|

0.5 Gallon Penn Plax Aqua-ponic | 5.875 x 5.875 x 8 | Cylinder |

1 Gallon Aqueon Frameless | 6.375 x 6.375 x 6.375 | Cube |

1 Gallon Koller Kit | 7.5 x 10.5 x 10.2 | Pentagon |

1 Gallon Koller Hex | 7.8 x 7.8 x 8 | Hexagon |

1 Gallon Koller BettaTank | 9 x 9 x 10 | Bowl |

1 Gallon Koller Deco | 15 x 3.8 x 8.5 | Half Circle |

1 Gallon Aqueon MiniBow LED Kit | 8.5 x 6.25 x 9.25 | Bow Front |

1.4 Gallon Penn Plax Aqua-ponic | 7.875 x 7.875 x 10 | Cylinder |

1.5 Gallon Tetra LED Cube Kit | 8.00 x 8.20 x 10.20 | Cube |

1.5 Gallon Tetra GloFish Kit | 7.25 x 8.5 x 11.5 | Cube |

1.5 Gallon Koller AquaScene | 8.5 x 8.5 x 9 | Cube |

1.5 Gallon Koller BettaView 360 | 8.1 x 8.1 x 9.8 | Cylinder |

1.5 Gallon Koller AquaView | 9 x 8.2 x 10.8 | Half Cylinder |

1.5 Gallon Penn Plax Betta Fish Kit | 8.5 x 6 x 9.5 | Rectangular |

1.6 Gallon Koller BettaTank Pedestal | 9.5 x 9.5 x 9.5 | Bowl |

1.7 Gallon Koller BettaTank | 9.5 x 9.5 x 11 | Bowl |

1.7 Gallon Koller AquaScene | 8.4 x 8.4 x 11 | Hexagon |

1.8 Gallon Tetra Waterfall Globe | 12 x 10.75 x 13.5 | Bowl |

2 Gallon Fluval Spec | 7.25 x 9.25 x 10 | Rectangular |

2 Gallon Koller Hex | 9.2 x 9.2 x 9.2 | Hexagon |

2 Gallon Koller AquaView 360 | 10.2 x 10.2 x 10.5 | Cylinder |

2 Gallon Koller Gumball | 8.5 x 8.5 x 10 | Bowl |

2 Gallon Penn Plax Prism Nano | 7 x 10 x 9 | Rectangular |

2.5 Gallon Koller AquaView | 9.5 x 9.5 x 11.2 | Pentagon |

2.5 Gallon Koller AquaTunes | 9.5 x 9.5 x 11.2 | Pentagon |

2.5 Gallon Koller AquaTunes | 9.5 x 9.5 x 11.2 | Cube |

2.5 Gallon Aqueon BettaBow LED Kit | 11.5 x 7.63 x 12.5 | Bow Front |

2.5 Gallon Aqueon MiniBow LED Kit | 11.5 x 7.63 x 12.5 | Bow Front |

2.6 Gallon Fluval Spec | 10.8 x 11.8 x 8.7 | Rectangular |

2.65 Gallon Marina 360 | 10 x 10 x 10 | Cylinder |

2.7 Gallon Penn Plax Vertex | 10 x 9 x 7.75 | Cube |

3 Gallon Tetra LED Cube Kit | 10.3 x 11 x 17.5 | Cube |

3 Gallon Marineland Silhouette | 14.2 x 13.7 x 12.3 | Rectangular |

3 Gallon Tetra GloFish Kit | 14.6 x 8.8 x 11.2 | Rectangular |

3 Gallon Tetra ColorFusion Half Moon | 12.9 x 6.8 x 12.5 | Half Cylinder |

3 Gallon Marineland Contour Desktop | 9.63 x 9.63 x 14 | Cube |

3 Gallon Tetra Bubbling Half Moon | 12.9 x 6.8 x 12.5 | Half Cylinder |

3 Gallon Tetra GloFish Half Moon | 7.5 x 7.5 x 7.7 | Half Cylinder |

3 Gallon Tetra GloFish Crescent | 13 x 7 x 9.5 | Bow Front |

3 Gallon Aqueon Frameless | 9.25 x 9.25 x 9.25 | Cube |

3 Gallon Koller AquaView 360 | 10.2 x 10.2 x 14.5 | Cylinder |

3 Gallon Koller AquaView | 14.5 x 10 x 9.2 | Flat Back Hexagon |

3 Gallon Koller AquaTunes | 12.8 x 11.8 x 9 | Cylinder |

3 Gallon Koller AquaView | 11.5 x 11 x 11 | Bowl |

3 Gallon Marineland Nook Kit | 13 x 7.1 x 9.3 | Bow Front |

3.4 Gallon Penn Plax Water World | 10.25 x 7.75 x 11 | Rectangular |

3.5 Gallon Koller AquaView | 11.2 x 8.8 x 13.5 | Half Cylinder |

3.5 Gallon Koller AquaTunes | 11.2 x 8.8 x 13.5 | Half Cylinder |

3.5 Gallon Koller | 11.2 x 8.8 x 13.5 | Half Cylinder |

4 Gallon biOrb Classic | 11.75 x 11.75 x 12.5 | Bowl |

4 Gallon biOrb Flow | 8.19 x 11.81 x 12.4 | Rectangular |

4 Gallon biOrb Halo | 11.81 x 11.81 x 13 | Bowl |

4 Gallon biOrb Life | 11.41 x 7.6 x 16 | Rectangular |

4 Gallon biOrb Tube | 12.91 x 12.91 x 12.4 | Cylinder |

4.5 Gallon Koller AquaView | 14.8 x 10.8 x 13.2 | Double Bullnose |

5 Gallon Marineland Portrait | 11.8 x 11.6 x 17 | Cube |

5 Gallon Marineland Contour Desktop | 9.6 x 9.6 x 19 | Cube |

5 Gallon Tetra Crescent | 16.5 x 11.25 x 13.2 | Bow Front |

5 Gallon Tetra ColorFusion Bubbling | 16 x 8 x 10 | Rectangular |

5 Gallon Tetra GloFish Glass | 16 x 8 x 10 | Rectangular |

5 Gallon Tetra GloFish Crescent | 15.5 x 9 x 11.5 | Bow Front |

5 Gallon Fluval Chi | 10 x 10 x 14.4 | Rectangular |

5 Gallon Fluval Spec | 20.5 x 11.6 x 7.5 | Rectangular |

5 Gallon Fluval EVO | 20.5 x 11.6 x 7.5 | Rectangular |

5 Gallon Marina Kit | 18.5 x 10.8 x 13.3 | Rectangular |

5 Gallon Koller PanaView | 14.2 x 11.5 x 10 | Round-edge Rectangular |

5 Gallon Aqueon MiniBow LED Kit | 14.5 x 10 x 13.5 | Bow Front |

5 Gallon Aqueon NeoGlow | 11.438 x 11.31 x 14.813 | Cube |

5 Gallon Marineland Nook Kit | 15.2 x 5 x 11.25 | Bow Front |

5 Gallon Marineland Escape 5 | 14 x 12.5 x 13.5 | Hexagon |

5 Gallon Penn Plax Water World | 13.75 x 8.75 x 11 | Rectangular |

5 Gallon Penn Plax Vertex | 12 x 10.5 x 9.75 | Cube |

5.5 Gallon Aqueon NeoGlow | 16.5 x 8.75 x 10.5 | Rectangular |

6 Gallon Aqueon Frameless | 11.5 x 11.5 x 11.5 | Cube |

6 Gallon Koller AquaView 360 | 11 x 11 x 19.8 | Cylinder |

6 Gallon Aqueon Ascent Frameless | 16 x 8.125 x 13.5 | Rectangular |

6 Gallon Fluval Edge | 16.9 x 10.25 x 14 | Rectangular |

6.5 Gallon Koller | 18 x 11 x 13.5 | Flat Back Hexagon |

7 Gallon Koller AquaView | 18.25 x 12.38 x 13.10 | Bow Front |

7.5 Gallon Aqueon NeoGlow | 14.813 x 14 x 13.813 | Cube |

7.5 Gallon Aqueon Shrimp Kit | 13 x 12 x 14 | Cube |

8 Gallon Aqueon NeoGlow | 15 x 13 x 15.25 | Hexagon |

8 Gallon biOrb Classic | 15.75 x 15.75 x 16.5 | Bowl |

8 Gallon biOrb Cube | 12.6 x 12.6 x 13.6 | Cube |

8 Gallon biOrb Flow | 10.23 x 14.96 x 15.35 | Rectangular |

8 Gallon biOrb Halo | 15.75 x 15.75 x 18.11 | Bowl |

8 Gallon biOrb Life | 15.75 x 9.25 x 16.54 | Rectangular |

8 Gallon biOrb Tube | 12.91 x 12.91 x 20.2 | Cylinder |

8.75 Gallon Aqueon Shrimp Kit | 18.25 x 12 x 13 | Rectangular |

8.8 Gallon Aqueon Aqua Springs | 15 x 15 x 14.75 | Cube |

9 Gallon Fluval Flex | 14 x 13 x 13 | Vertical Bow Front |

9 Gallon biOrb Tube | 16.14 x 16.14 x 14.53 | Cylinder |

10 Gallon Marineland BIO Wheel | 20 x 10 x 12 | Rectangular |

10 Gallon Tetra ColorFusion Bubbling | 20 x 10 x 12 | Rectangular |

10 Gallon Tetra PLAYMOBIL | 20 x 10 x 13 | Rectangular |

10 Gallon Tetra Complete LED | 20 x 10 x 12 | Rectangular |

10 Gallon Tetra Goldfish | 20 x 10 x 12 | Rectangular |

10 Gallon Tetra Half Moon | 17.75 x 11 x 17 | Half Cylinder |

10 Gallon Tetra GloFish Glass | 20 x 10 x 12 | Rectangular |

10 Gallon Aqueon Glass | 14.5 x 12.625 x 18.375 | Hexagon |

10 Gallon Marina Kit | 22.6 x 12.6 x 15.3 | Rectangular |

10 Gallon NUVO Fusion Pro | 11.8 x 15 x 13 | Cube |

10 Gallon Aqueon | 20.25 x 10.5 x 15 | Rectangular |

10 Gallon Aqueon Ascent Frameless | 18.75 x 10 x 15.75 | Rectangular |

10 Gallon Aqueon Hexagon LED Kit | 14.5 x 13.375 x 14.75 | Hexagon |

10 Gallon Aqueon Incandescent LED Kit | 22.88 x 12.75 x 13.88 | Rectangular |

10 Gallon Aqueon NeoGlow | 20.5 x 10.5 x 12.5 | Rectangular |

10 Gallon Penn Plax Water World | 17.75 x 11.75 x 12.63 | Rectangular |

10 Gallon Penn Plax Vertex | 13.75 x 13.75 x 13.75 | Cube |

11 Gallon Aqueon Framless | 20.25 x 10.5 x 12.625 | Rectangular |

11 Gallon Aqueon Frameless | 20.25 x 10.5 x 12.625 | Rectangular |

11 Gallon Aqueon Aqua Springs | 15 x 15 x 17.75 | Cube |

12 Gallon Fluval Edge | 17.5 x 10.25 x 22.9 | Cube |

12 Gallon biOrb Life | 14.76 x 10 x 22.04 | Rectangular |

13.5 Gallon Fluval EVO | 22 x 15 x 11.5 | Rectangular |

14 Gallon Aqueon Frameless | 15.125 x 15.125 x 15.125 | Cube |

14 Gallon NUVO Fusion Pro Peninsula | 11.8 x 20 x 13 | Rectangular |

14.5 Gallon Fluval Flora | 15 x 15 x15 | Cube |

15 Gallon Fuval Flex | 16 x 15 x 15 | Vertical Bow Front |

15 Gallon SeaClear Deluxe | 15 x 15 x 20 | Hexagon |

15 Gallon Aqueon Column | 13.75 x 13.75 x 25 | Cube |

16 Gallon Aqueon | 20.25 x 12.875 x 17.75 | Bow Front |

16 Gallon Fluval Spec | 21.8 x 11.5 x 17.5 | Rectangular |

16 Gallon Aqueon Bow Front LED Kit | 20.25 x 12.875 x 20.5 | Bow Front |

16 Gallon biOrb Classic | 19.75 x 19.75 x 20.5 | Bowl |

16 Gallon biOrb Cube | 15.75 x 15.75 x 17 | Cube |

16 Gallon biOrb Halo | 19.66 x 19.66 x 22.83 | Bowl |

16 Gallon biOrb Life | 16.54 x 11 x 24.4 | Rectangular |

### Mid-Sized Branded Aquariums

The mid-sized branded tanks can also be good for starters in the hobby, as long as they are not too weirdly-shaped.

Aquarium Kit | Dimensions in Inches L x W x H | Shape |
---|---|---|

20 Gallon Marineland BIO Wheel | 24 x 12 x 16 | Rectangular |

20 Gallon Tetra Complete LED | 24 x 12 x 16 | Rectangular |

20 Gallon Tetra Goldfish | 24 x 12 x 16 | Rectangular |

20 Gallon Aqueon Glass | 18.75 x 16.25 x 20.625 | Hexagon |

20 Gallon SeaClear Deluxe | 15 x 15 x 24 | Hexagon |

20 Gallon SeaClear | 24 x 13 x 16 | Rectangular |

20 Gallon Marina Kit | 26.3 x 15 x 19 | Rectangular |

20 Gallon NUVO Fusion Pro | 23.62 x 15 x 13 | Rectangular |

20 Gallon NUVO Fusion Pro Peninsula | 11.8 x 30 x 13 | Rectangular |

20 Gallon NUVO Concept Pro Peninsula | 15 x 20 x 13 | Drop Off Rectangular |

20 Gallon NUVO Concept Pro | 20 x 15 x 13 | Drop Off Rectangular |

20 Gallon Aqueon Ascent Frameless | 23.75 x 12.625 x 19.75 | Rectangular |

20 Gallon Aqueon Hexagon LED Kit | 18.75 x 16.25 x 23 | Hexagon |

20 Gallon Marineland Half Moon Combo | 23.5 x 12.12 x 23.45 | Half Cylinder |

21 Gallon Aqueon Framless | 24.25 x 12.25 x 16.75 | Rectangular |

21 Gallon Aqueon Frameless | 24.25 x 12.25 x 16.75 | Rectangular |

25 Gallon NUVO Fusion Pro Lagoon | 23.62 x 19.68 x 11.8 | Rectangular |

25 Gallon NUVO EXT Lagoon | 23.6 x 19.7 x 11.8 | Cube |

26 Gallon Aqueon | 24.125 x 14.75 x 20.875 | Bow Front |

26 Gallon SeaClear | 36 x 12 x 16 | Flat Back Hexagon |

26 Gallon Aqueon Bow Front LED Kit | 24.125 x 14.75 x 23.625 | Bow Front |

28 Gallon Tetra Connect | 24 x 15 x 18.9 | Bow Front |

28 Gallon biOrb Classic | 24 x 24 x 25 | Bowl |

29 Gallon Marineland BIO Wheel | 30.25 x 12.5 x 18.75 | Rectangular |

29 Gallon Tetra Complete LED | 30 x 12 x 18 | Rectangular |

29 Gallon SeaClear | 30 x 12 x 18 | Rectangular |

30 Gallon Aqueon Framless | 30.25 x 12.5 x 18.75 | Rectangular |

30 Gallon SeaClear | 36 x 12 x 16 | Rectangular |

30 Gallon NUVO Fusion Pro | 35.43 x 14.96 x 12.99 | Rectangular |

30 Gallon NUVO EXT | 35.4 x 15 x 13 | Rectangular |

30 Gallon Aqueon Frameless | 30.25 x 12.5 x 18.75 | Rectangular |

30 Gallon Marineland Half Moon Combo | 26.7 x 13.5 x 26.9 | Half Cylinder |

32.5 Gallon Fluval Flex | 32.5 x 15.35 x 15.75 | Vertical Bow Front |

35 Gallon Aqueon Glass | 23.25 x 20.25 x 24.75 | Hexagon |

35 Gallon Aqueon Hexagon LED Kit | 23.25 x 20.25 x 27.125 | Hexagon |

36 Gallon Aqueon | 30.25 x 15.5 x 20.875 | Bow Front |

36 Gallon Aqueon Bow Front LED Kit | 30.25 x 15.5 x 23.625 | Bow Front |

40 Gallon SeaClear | 36 x 12 x 16 | Rectangular |

40 Gallon NUVO Fusion Pro | 23.62 x 19.68 x 18.89 | Cube |

45 Gallon NUVO EXT | 23.6 x 19.7 x 18.9 | Cube |

46 Gallon Aqueon | 36.375 x 16.375 x 20.875 | Bow Front |

46 Gallon SeaClear | 36 x 16.25 x 20 | Bow Front |

### Large Branded Aquariums

And finally, here are the dimensions of large branded tanks that have irregular shapes.

Aquarium Kit | Dimensions in Inches L x W x H | Shape |
---|---|---|

50 Gallon SeaClear | 36 x 15 x 20 | Rectangular |

50 Gallon NUVO Fusion Pro Lagoon | 29.92 x 23.62 x 16.14 | Rectangular |

50 Gallon NUVO EXT Lagoon | 30 x 23.6 x 16.1 | Rectangular |

50 Gallon NUVO INT | 23.6 x 23.6 x 19.7 | Cube |

54 Gallon Aqueon | 39 x 27.25 x 23 | Corner Bow Front |

55 Gallon Marineland BIO Wheel | 48.25 x 12.75 x 21 | Rectangular |

55 Gallon Tetra Complete LED | 48 x 13 x 21 | Rectangular |

60 Gallon NUVO SR Pro | 35.43 x 23.62 x 16.14 | Rectangular |

70 Gallon NUVO INT | 23.6 x 35.4 x 55 | Drop Off Rectangular |

72 Gallon Aqueon | 48.375 x 18 x 23 | Bow Front |

75 Gallon NUVO EXT | 35.4 x 23.6 x 19.7 | Rectangular |

75 Gallon NUVO INT | 35.4 x 23.6 x 19.7 | Rectangular |

90 Gallon NUVO SR Pro | 47.24 x 23.62 x 16.14 | Rectangular |

100 Gallon NUVO EXT | 47.3 x 23.6 x 19.7 | Rectangular |

100 Gallon NUVO INT | 47.3 x 23.6 x 19.7 | Rectangular |

112 Gallon NUVO INT Lagoon | 35.4 x 35.4 x 19.7 | Cube |

150 Gallon NUVO INT Lagoon | 47.3 x 35.4 x 19.7 | Rectangular |

200 Gallon NUVO INT | 70.9 x 30 x 21.7 | Rectangular |

200 Gallon NUVO EXT | 70.9 x 30 x 21.7 | Rectangular |

## How to Calculate the Weight of Your Aquarium?

To calculate the total weight of an aquarium you’d want to first figure out how much it weighs empty.

After that, you calculate the water weight and then add the two together. To find out how much your tank weighs follow these steps:

- Calculate the surface area of the fish tank.
To find the total surface area of your tank you’d need to find the surface areas of each of its walls, including the bottom, and add them together.

The surface area of each rectangular flat surface is calculated by multiplying its sides.

So if your tank’s wall measures 10 x 20 inches, then you multiply that and get that the surface area of that wall is 200 square inches.

Do this for each of the tank’s flat surfaces and add them together.

The formula for finding the surface area for a standard rectangular tank is:

*(2 × length × height) for the sides + (2 × width × height) for the other two sides + (width × length) for the bottom*.Bowfront tanks are an exception to this formula because they have a curved wall which is almost impossible to calculate on your own at home.

- Calculate the empty weight of your tank.
To calculate the empty weight of a tank you’d want to multiply its total surface area by the thickness of the walls.

The material your tank is made of plays a role here since different materials have different weights.

Typically aquariums are made of acrylic or glass. Glass weighs roughly 0.5165 pounds per square foot for each millimeter of thickness.

Acrylic weighs approximately 0.24 pounds per square foot for each millimeter of thickness.

Measure the thickness of the tank’s walls in millimeters and write that down.

To proceed with calculating the tank’s empty weight you’d want to convert the square inches of total surface area we found in step 1 into square feet.

This is easily done by dividing the total square inches by 144 since there are 144 sq inches in an sq foot.

After you convert the surface area of the fish tank in square feet multiply that by the thickness of the glass in millimeters and the specific weight of the material.

The formula looks like this:

*Tank Surface Area in Square Feet × Thickness of the Wall in mm × Specific Material Weight*.For example, if your tank has 7 square feet of surface area, with a wall thickness of 10 mm, and is made of glass the calculation would be 7 × 10 × 0.5165 = 36.155 pounds of empty weight.

- Calculate the gallon capacity of the tank.
All tanks that you buy from the store will have a label clearly stating how much water they can hold.

However, if you get a second-hand tank or have just forgotten what it was there is a way to calculate that.

You simply need to convert the tank’s height, length, and width from inches to feet, then multiply them to find out the volume in inches.

Turn that into cubic feet and multiply the result by 7.48. To convert the cubic inches into cubic feet you need to divide the volume by 1728.

If this seems counterintuitive thank the Imperial unit system.

Taking this into account you can use the following formula to calculate the gallon capacity of your tank:

*(Lenght × Width × Height, all in inches) ÷ 1728 x 7.48*So if you have a tank that measures 10 × 20 × 15 inches and you’re going to fill it with fresh water, then the calculation would look like this:

((10 × 20 × 15) ÷ 1728) × 7.48 = roughly 13 gallons.

- Calculate the filled weight of the tank.
To do so you’d want to first find the weight of water and then add that up to the empty tank weight.

To calculate the weight of water:

Multiply the gallon capacity of your tank, which we found in step 3 by how much water weighs per pound.

Freshwater and saltwater have different weights because of their different density.

Freshwater weighs 8.345 pounds per gallon. Saltwater is heavier and weighs about 8.554 pounds per gallon.

So if your tank can hold 20 gallons and you want to fill it with freshwater then multiply 20 × 8.345 = 166.9 pounds.

Now add that up to the tank’s empty weight (calculated in step 2) and you’d find the total weight of your tank when it’s filled to the brim with water.

I provided all the formulas so that anyone with a non-standard tank can figure it out on their own.

For a generic weight estimate of standard tanks you can use a fish tank weight calculator like this one.

## Getting equipment according to the dimensions of the aquarium?

Selecting aquarium equipment based on the size of the tank is essential for its long-term success.

#### Lighting

The dimensions of a fish tank play a huge role in the choice of aquarium lighting because light itself has a limited water penetration.

by tomas10024

If you’re in the middle of your research on choosing a suitable light fixture for your aquarium plants you can check my guide on that here.

In that link, I do specific product recommendations based on aquarium depth and the type of plants you may want to keep.

The same rules apply for picking adequate grow lights for saltwater reef aquariums.

Corals are very sensitive to the intensity and spectrum of the incoming light they use for photosynthesis.

To end up with the right LED light you’ll need to take into account the dimensions of your coral reef aquarium.

There are stronger units that penetrate the water well and are suitable for deeper reef tanks and others that are less intense, making a good addition to aquariums with less demanding corals.

I made specific recommendations on choosing the best LED lights for corals based on aquarium height and the species you want to keep. Visit the link to learn more.

#### Filter

Choosing the flow rate of a water filter should also be made in conjunction with the gallon capacity of the fish tank.

If you keep larger carnivorous fish that produce more waste or you plan to overstock the tank you’d want a stronger filter that turns the water at least 6 times per hour.

For Oscar or Cichlid fish tanks getting an external canister filter makes perfect sense as these units produce more flow and have enormous space for media, which in turn keeps the aquarium clean and safe.

I have an article on choosing one according to your aquarium’s gallon capacity (visit the link to learn how to make a choice).

If you want to keep aquatic turtles you should still take into consideration the available water volume in the aquarium.

In this case, you can check my article on picking a good filter for a turtle aquarium according to gallon capacity.

Turtles are messier than most aquatic pets and require a water turn over of at least 8 times the whole aquarium’s gallon capacity per hour.

by turtleuwu69

#### Heater

A small 3-gallon, 5-gallon, or 10-gallon tank with tropical fish requires a small-sized aquarium heater that’s ideally under 6.5 inches in length.

I’ve seen enough small aquariums with a spoiled interior because the owner got an over-sized heater.

#### Wavemaker

Last but not least, the gallon capacity of your reef tank, for example, plays a major role in your choice of aquarium wavemaker.

You can check my guide on how to make the correct choice by clicking here.

Knowing the exact dimensions of your new fish tank will give you the needed information to make adequate decisions on choosing livestock and the purchase of equipment.

Drop me a comment below if you have any questions in those areas and I will answer as soon as I see it.

Great article! Wondering if you could help me with finding a gallon size of a 36” L x 12”D x 16”H flat back hexagon? Maybe a lid for it too

Where can I get a 30 Gallon Extra Tall?

Good question.

They are not very common so your best chance would be online.

I have been looking high and low for a air pump that will be sufficient for my needs but is quiet and doesn’t get hot. Would like to know if the Fluval Q2 is a good choice and if it will be strong enough to run several 18″ air bars in the bottom of my soon to be standard size 120 gallon. I will be upgrading and I haven’t even be able to find one strong enough for my 55 gallon. Any help would be great.

Have a 10inches in height 10inches in width and 12inches dept dont know what gallon it is? Help

Hi, that would be a 5-gallon tank.

The formula is as follows:

10 inches = 0.83 Feet

12 inches = 1 Foot

(Lenght x Width x Depth) in feet = 0.6889 Cubic Feet.

Cubic ft x 7.47 = 5.15 Gallons.

I have an aquarium that is 48″x 12″ x 31″ which is about 75 gallons. I am just wondering if you might know who it is made by? I can’t find any information about a tank with these dimensions.

Thank you.

My tank is a 30×12×12 is that consider a 20 gallon

In my calculations, that’s a little over 18 gallons.

I don’t have the slightest idea of where to begin with this tank! This is all new to me. From your cheat sheet I am guessing I have a 29 gallon tank. I’m confused though as to which 29 gallon tank I have because you have different types of tanks listed. The tank was given to me. Once I figure this part out then maybe I can figure out where to go from there lol. Help please!

Hi Denise,

Could you measure its dimensions? This will help in figuring out which one you have.

From there on, you just need to equip it with the right filter / lighting according to the tank’s size and the setup you’d want to achieve (e.g. heavily planted, non-planted, lots of fish, etc.).

Best,

Momchil

Great information! Thank you for the article.

Thank you TKP!