Standard Aquarium Sizes Dimensions, Capacities, and Weights

There’s several ways to settle on the perfect aquarium, but before you agree on a specific tank there’s a couple of basic calculations you’ll want to see . The advantage of going with standard aquarium sizes over a custom design is that the simple determining the aquarium’s dimensions and weight, so let’s take a deeper check out these tanks

Table of Contents

Guide to plain Aquarium Sizes
The modern loft interior with aquarium. 3d concept
If you’ve shopped around for aquariums within the previous couple of years, you’ll have noticed that there’s tons of options when it involves modern tank styles and styles . this is often an enormous change from the past once we only had the selection between standard size aquariums or dispensing the large bucks for a custom tank.

These days, the most advantage of selecting a standard-sized aquarium over a singular design is you’ll easily search and compare their dimensions, capacities and most significantly , estimate what proportion the filled tank will weigh. This spares you from having to use an aquarium calculator or doing the maths by hand.

What Are Standard Aquariums?

Standard aquariums are the classic rectangular glass tanks that are sealed with silicone and have a plastic base and rim for extra support. These tanks are made up of glass that’s usually 0.375 to 0.5 inches thick, and bigger standards over 40-gallons have additional support rails across the middle of the aquarium.

Vector of rectangular aquarium with dimensional signs.
Standard tanks are measured externally across the plastic base. Measurements may vary slightly across brands without altering their basic specs. as an example , all standard 10-gallon tanks have approximately an equivalent dimensions (20 x 10 x 12 inches) and weigh about 111 pounds when crammed with gravel and water.

It’s very easy to match standard tanks by watching a table, just like the ones we’ve provided below. It’s harder to match aquariums when you’re watching a rimless, bow front or other non-standard sizes like hexagon fish tanks, and you’ll likely got to play with those pesky calculators and make your own aquarium size charts.

Standard Tank Sizes within the US

Let’s compare the specs between a good range of ordinary tank sizes, from small Nano aquariums to the large behemoths that weigh over plenty when filled. Unlike the remainder of the planet , aquariums within the US are rated by their capacity in gallons of water rather than liters.

Small Aquariums
Small Meadow Aquascape
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Small aquariums home in capacity from 2.5 to fifteen gallons of water, and lots of can easily fit on a desk or sturdy table, so you’ll not got to invest in an aquarium stand. While these sizes are fashionable beginners, it’s actually much harder to worry for alittle tank. Things can quickly go sideways in these tiny set-ups.

Standard Aquarium
(US Gallons)

2.5 gallon

5 gallon

10 gallon “Leader”

15 gallon

15 gallon Tall

(L x W x H inches)

12 x 6 x 8

16 x 8 x 10

20 x 10 x 12

24 x 12 x 12

20 x 10 x 18

Empty Aquarium Weight

3 pounds

7 pounds

11 pounds

21 pounds

22 pounds

Filled Freshwater Weight

27 pounds

62 pounds

111 pounds

170 pounds

170 pounds

Medium Aquariums

Aquarium with cichlids fish from lake malawi
The ideal capacity for a beginning fish keeper may be a medium-size aquarium from 20 to 40 gallons. they’re not terribly expensive to set-up, and with a strong filtration system and good aquarium maintenance, it’s easy to avoid problems. If you check out their filled weights, however, you’ll see that investing during a good stand is perhaps the thanks to go.

Standard Aquarium
(US Gallons)

20 gallon High

20 gallon Long

25 gallon

29 gallon

30 gallon Breeder

40 gallon Long

40 gallon Breeder

(L x W x H inches)

24 x 12 x 16

30 x 12 x 12

24 x 12 x 20

30 x 12 x 18

36 x 18 x 12

48 x 12 x 16

36 x 18 x 16

Empty Aquarium Weight

25 pounds

25 pounds

32 pounds

40 pounds

48 pounds

55 pounds

58 pounds

Filled Freshwater Weight

225 pounds

225 pounds

282 pounds

330 pounds

384 pounds

455 pounds

458 pounds

Large Aquariums

Beautiful aquarium within the front room .
The biggest standard aquariums range from 50 to almost 200 gallons in capacity, and these large aquariums require tons of thought and planning. You’ll definitely want to take a position during a quality stand, perhaps with an identical hood, and you’ll likely got to measure the space to make sure you’ve space for equipment like filters, sumps, or chillers.

Standard Aquarium
(US Gallons)

50 gallon

55 gallon

65 gallon

75 gallon

90 gallon

125 gallon

150 gallon

180 gallon

(L x W x H inches)

36 x 18 x 19

48 x 13 x 21

36 x 18 x 24

48 x 18 x 21

48 x 18 x 24

72 x 18 x 21

72 x 18 x 28

72 x 24 x 25

Empty Aquarium Weight

100 pounds

78 pounds

126 pounds

140 pounds

160 pounds

206 pounds

338 pounds

430 pounds

Filled Freshwater Weight

600 pounds

628 pounds

772 pounds

850 pounds

1050 pounds

1400 pounds

1800 pounds

2100 pounds

Extra Large Aquariums

The interior of the Oceanarium Crocus City, over 5000 species of fish and other animals from everywhere the planet . Moscow, Russia
Once you begin considering tanks bigger than 180 gallons, you actually don’t have any standard options to settle on from. Each manufacturer has their own unique extra-large models, often made up of lighter materials like acrylic and with features like rounded corners and predrilled holes for chillers and sump filters. You’ll want to match specific brands and models to seek out the simplest fit your home.

How to Choose the proper Aquarium Size
There’s several factors you ought to consider before you agree on a tank size and elegance . It’s easier to take care of larger aquariums and that they are a far better choice for novice aquarists. If something goes wrong during a small capacity tank you’ll not catch things in time to stop a crash.

Tank Size and Weight
Obviously, you’ll want to settle on a tank that physically fits within the location you’ve picked out for your aquarium. the size of your tank directly impact its weight, and you shouldn’t assume that tanks with an equivalent capacity will have an equivalent filled weight, especially when comparing standard to non-standard designs.

For instance, you’ll notice that the 2 standard 40-gallon tanks differ in their empty and filled weight by a couple of pounds even with similar capacities. It’s better to overestimate your aquarium’s filled weight rather than risking a collapse. the majority of your tank’s weight comes from the substrate/decor and therefore the water it holds.

close up image of underwater landscape nature style aquarium tank with a spread of aquatic plants inside.
You’ll usually add about 1-pound of substrate per gallon of water, but this varies quite bit. For compact options like sand and fine gravels, you’ll often need to use half-again or twice the maximum amount to urge the coverage you would like , especially for aquascaped and planted tanks. a typical planted 10-gallon can easily weigh over 120 pounds.

How Much Does a Gallon of Water Weigh?
The weight of a gallon of water varies a touch round the world, since it depends on the water’s density and the way it’s measured. In the US, a gallon of water contains 3.785 liters, while the UK’s gallon is that the like 4.546 liters. So you’ll want to double-check your units of measurement to avoid making a mistake .

Freshwater is lighter than saltwater, and therefore the exact weight of a gallon of water depends on the temperature, mineral content and salinity. Freshwater weighs about 8.345 pounds per gallon, and a gallon of saltwater is about 8.554 pounds.

Freshwater vs seafood
You’ll also want to think about what quite fish you’d wish to keep and whether you’d prefer a freshwater or saltwater set-up. Your aquarium size and capacity will influence the kinds of animals you’ll keep and the way many aquatic pets will fit harmoniously in your community.

Freshwater Fish Size Guide
Neon tetra fish with water plant in aquarium
Freshwater aquariums are the simplest type for novices and beginners to start out with, since they’re easier to set-up and maintain. While the rule-of-thumb is to permit for a minimum of 1-gallon of water per inch of fish during a freshwater aquarium, it just depends on the requirements of every species:

Neon Tetras are just one .5-inches long , but they have a minimum of a 10-gallon tank because they like to be kept in groups of 10 or more.
A group of three guppies, on the opposite hand, do exactly fine together during a 5-gallon tank.

Betta Fish

Common Goldfish

Fancy Goldfish

Neon Tetra


Average Size

2.5 to five inches

8 to 12 inches

6 to eight inches

1.5 inches

1 to 2.5 inches

US Gallons
per Fish

2.5 to five gallons

20 to 30 gallons

15 to twenty gallons

1 to 2 gallons

1 to 2 gallons

Tank Size

2.5 to five gallons

20 gallons

15 gallons

10 gallons

5 gallons

Saltwater Fish Size Guide
The Marine Fish – Ocellaris clownfish
Saltwater tanks require a heftier investment in equipment like chillers, wavemakers and LED lights and are more complicated to determine and maintain. It’s usually best to urge some fishkeeping experience before you dive into a saltwater set-up.

Saltwater fish require more care overall, since even topping off the water within the tank requires you to concentrate to your water’s salinity levels.
Depending on their size and activity levels, some seafood need very roomy environments to stay healthy.
Saltwater fish also are costlier to get , so stocking a tank are often a dear endeavor.

Clown Fish

Yellow Tang

Watchman Goby

Azure Damselfish

Purple Firefish

Average Size (length)

3 inches

8 inches

4 inches

2.5 inches

2.5 to 3.25 inches

Minimum Tank Size

30 gallons

100 gallons

30 gallons

30 gallons

10 gallons

Type of Aquatic Set-Up
Beautiful planted tropical freshwater aquarium with fishes. Aquascape.
The best size and shape for your aquarium also depends on how you’re getting to use it. Non-standard designs like tall portrait-style and cube-shaped tanks are attractive, but often a poor option for really active swimmers, like goldfish.

If you only need small tanks for a hospital or quarantine set-ups, a few of ordinary 5 or 10-gallons could also be ideal. they’re compact but wide enough for fish to swim and you’ll swap equipment between tanks when needed.
Breeder tanks are a well-liked choice for medium-sized community aquariums, because their deep and shallow design allows for more area and better gas exchange.
Tall-style tanks are an excellent thanks to show-off a mixed community, and therefore the additional height can help your mid-dwellers and surface fish stand out.
Standard aquariums make designing and fixing your tank a breeze, because you’ll easily search their dimensions and estimate their filled weight without having to strain your brain with equations. What size aquarium did you select , and did you accompany a typical tank or a singular design? Share your comments below!

You might have an interest in our comprehensive guide about successfully fixing a aquarium . Learn more about it here.

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