Fish Tank Sizes

Below you will find a list of common and typical standard aquarium sizes, including small, medium and large sizes. The list includes their capacity measured in gallons, dimensions measured in inches (length, width, and height), as well as their empty weight in pounds and weight when filled with water in pounds. This information is helpful for those looking to purchase a new aquarium or for those who want to ensure their current tank is the appropriate size for their fish and aquatic plants. The table includes sizes starting from 2.5 gallons to 225 gallons, with breeder, tall and long variations.

Standard Aquarium Size Chart

This table provides information on standard glass rectangle aquarium sizes, including their capacity measured in gallons, dimensions measured in inches (length, width, and height), as well as their empty weight in pounds and weight when filled with water in pounds.

Tank Size
(gallons)
Dimensions in Inches
(length x width x height)
Weight
(pounds)
Weight with Water
(pounds)
2.5 gallon 12″ x 6″ x 8″ 2.6 lbs 27 lbs
5 gallon 16″ x 8.5″ x 10.5″ 7 lbs 62 lbs
10 gallon 20″ x 10.5″ x 12.5″ 11 lbs 111 lbs
15 gallon 24″ x 12.5″ x 13.75″ 21 lbs 170 lbs
20 gallon (tall) 24″ x 12.5″ x 16.75″ 25 lbs 225 lbs
20 gallon (long) 30″ x 12″ x 12.75″ 25 lbs 225 lbs
29 gallon 30″ x 12.5″ x 18.75″ 40 lbs 330 lbs
30 gallon (breeder) 36″ x 12.5″ x 16.75″ 43 lbs 343 lbs
40 gallon (breeder) 36″ x 18″ x 17″ 58 lbs 458 lbs
40 gallon (long) 48″ x 12.75″ x 17″ 55 lbs 455 lbs
50 gallon 36″ x 18″ x 19″ 68 lbs 600 lbs
55 gallon 48″ x 12.75″ x 21″ 78 lbs 625 lbs
60 gallon (breeder) 48″ x 18.5″ x 16″ 90 lbs 680 lbs
75 gallon 48″ x 18.5″ x 21″ 98 lbs 785 lbs
90 gallon 48″ x 18.5″ x 25″ 135 lbs 1050 lbs
125 gallon 72″ x 18.5″ x 23″ 177 lbs 1400 lbs
150 gallon 72″ x 18.5″ x 29.5″ 281 lbs 1800 lbs
180 gallon 72″ x 24.5″ x 25.5″ 282 lbs 2100 lbs
210 gallon 72″ x 24.5″ x 29.5″ 343 lbs 2450 lbs
225 gallon 72″ x 27.5″ x 27.5″ 398 lbs 2635 lbs

Standard Aquarium Tank Sizes and Dimensions:

Small Fish Tank Sizes:

2.5 Gallon Tank Dimensions

The 2.5-gallon tank has dimensions of 12 inches in length, 6 inches in width, and 8 inches in height. It has an empty weight of 2.6 pounds and a weight of 27 pounds when filled with water.

5 Gallon Tank Dimensions

The 5-gallon tank has dimensions of 16 inches in length, 8.5 inches in width, and 10.5 inches in height. It has an empty weight of 7 pounds and a weight of 62 pounds when filled with water.

10 Gallon Tank Dimensions

The 10-gallon tank has dimensions of 20 inches in length, 10.5 inches in width, and 12.5 inches in height. It has an empty weight of 11 pounds and a weight of 111 pounds when filled with water.

15 Gallon Tank Dimensions

The 15-gallon tank has dimensions of 24 inches in length, 12.5 inches in width, and 13.75 inches in height. It has an empty weight of 21 pounds and a weight of 170 pounds when filled with water.

Medium Fish Tank Sizes:

20 Gallon Tall Tank Dimensions

The 15-gallon tank has dimensions of 24 inches in length, 12.5 inches in width, and 13.75 inches in height. It has an empty weight of 21 pounds and a weight of 170 pounds when filled with water.

20 Gallon Long Tank Dimensions

The 20-gallon (tall) tank has dimensions of 24 inches in length, 12.5 inches in width, and 16.75 inches in height. It has an empty weight of 25 pounds and a weight of 225 pounds when filled with water.

29 Gallon Tank Dimensions

The 15-gallon tank has dimensions of 24 inches in length, 12.5 inches in width, and 13.75 inches in height. It has an empty weight of 21 pounds and a weight of 170 pounds when filled with water.

30 Gallon Breeder Tank Dimensions

The 30-gallon (breeder) tank has dimensions of 36 inches in length, 12.5 inches in width, and 16.75 inches in height. It has an empty weight of 43 pounds and a weight of 343 pounds when filled with water.

40 Gallon Breeder Tank Dimensions

The 40-gallon (breeder) tank has dimensions of 36 inches in length, 18 inches in width, and 17 inches in height. It has an empty weight of 58 pounds and a weight of 458 pounds when filled with water.

40 Gallon Long Tank Dimensions

The 40-gallon (long) tank has dimensions of 48 inches in length, 12.75 inches in width, and 17 inches in height. It has an empty weight of 55 pounds and a weight of 455 pounds when filled with water.

Large Fish Tank Sizes:

50 Gallon Tank Dimensions

The 50-gallon tank has dimensions of 36 inches in length, 18 inches in width, and 19 inches in height. It has an empty weight of 68 pounds and a weight of 600 pounds when filled with water.

55 Gallon Tank Dimensions

The 55-gallon tank has dimensions of 48 inches in length, 12.75 inches in width, and 21 inches in height. It has an empty weight of 78 pounds and a weight of 625 pounds when filled with water.

60 Gallon Breeder Tank Dimensions

The 60-gallon (breeder) tank has dimensions of 48 inches in length, 18.5 inches in width, and 16 inches in height. It has an empty weight of 90 pounds and a weight of 680 pounds when filled with water.

75 Gallon Tank Dimensions

The 75-gallon tank has dimensions of 48 inches in length, 18.5 inches in width, and 21 inches in height. It has an empty weight of 98 pounds and a weight of 785 pounds when filled with water.

90 Gallon Tank Dimensions

The 90-gallon tank has dimensions of 48 inches in length, 18.5 inches in width, and 25 inches in height. It has an empty weight of 135 pounds and a weight of 1050 pounds when filled with water.

125 Gallon Tank Dimensions

The 125-gallon tank has dimensions of 72 inches in length, 18.5 inches in width, and 23 inches in height. It has an empty weight of 177 pounds and a weight of 1400 pounds when filled with water.

150 Gallon Tank Dimensions

The 150-gallon tank has dimensions of 72 inches in length, 18.5 inches in width, and 29.5 inches in height. It has an empty weight of 281 pounds and a weight of 1800 pounds when filled with water.

180 Gallon Tank Dimensions

The 180-gallon tank has dimensions of 72 inches in length, 24.5 inches in width, and 25.5 inches in height. It has an empty weight of 282 pounds and a weight of 2100 pounds when filled with water.

210 Gallon Tank Dimensions

The 210-gallon tank has dimensions of 72 inches in length, 24.5 inches in width, and 29.5 inches in height. It has an empty weight of 343 pounds and a weight of 2450 pounds when filled with water.

225 Gallon Tank Dimensions

The 225-gallon tank has dimensions of 72 inches in length, 27.5 inches in width, and 27.5 inches in height. It has an empty weight of 398 pounds and a weight of 2635 pounds when filled with water.

Standard Aquarium Size Chart in Metric Units (cm, liters)

This table provides information on standard glass rectangle aquarium sizes, including their capacity measured in liters, dimensions measured in centimeters (length, width, and height), as well as their empty weight in kilograms and weight when filled with water in kilograms.

Tank Size
(gallons)
Tank Size
(liters)
Dimensions in cm
(length x width x height)
Weight
(kg)
Weight with Water
(kg)
2.5 gallons 9.5 liters 30.5 x 15.2 x 20.3 cm 1.2 kg 12.3 kg
5 gallons 18.9 liters 40.6 x 21.6 x 26.7 cm 3.2 kg 28.2 kg
10 gallons 37.9 liters 50.8 x 26.7 x 31.8 cm 5 kg 50.5 kg
15 gallons 56.8 liters 61 x 31.8 x 34.9 cm 9.5 kg 77.1 kg
20 gallons (tall) 75.7 liters 61 x 31.8 x 42.5 cm 11.3 kg 102.6 kg
20 gallons (long) 75.7 liters 76.2  x 30.5 x 32.4 cm 11.3 kg 102.6 kg
29 gallons 113.6 liters 76.2 x 31.8 x 47.6 cm 18.1 kg 149.7 kg
30 gallons (breeder) 113.6 liters 91.4 x 31.8 x 42.6 cm 19.5 kg 155.7 kg
40 gallons (breeder) 151.4 liters 91.4 x 45.7 x 43.2 cm 26.3 kg 208.7 kg
40 gallons (long) 151.4 liters 121.9 x 32.4 x 43.2 cm 24.9 kg 205.4 kg
50 gallons 189.3 liters 91.4 x 45.7 x 48.3 cm 30.9 kg 272.2 kg
55 gallons 208.2 liters 121.9 x 32.4 x 53.3 cm 35.4 kg 284.0 kg
60 gallons (breeder) 227.1 liters 121.9 x 47.0 x 40.6 cm 40.8 kg 309.0 kg
75 gallons 283.9 liters 121.9 x 47.0 x 53.3 cm 44.5 kg 355.2 kg
90 gallons 340.7 liters 121.9 x 47.0 x 63.5 cm 61.7 kg 952.4 kg
125 gallons 473.2 liters 182.9 x 47.0 x 58.4 cm 80.3 kg 635.8 kg
150 gallons 567.8 liters 182.9 x 47.0 x 74.9 cm 127.8 kg 816.1 kg
180 gallons 681.5 liters 182.9 x 62.2 x 64.8 cm 127.9 kg 952.4 kg
210 gallons 796.7 liters 182.9 x 62.2 x 74.9 cm 155.7 kg 1119.5 kg
225 gallons 852.4 liters 182.9 x 69.9 x 69.9 cm 180.1 kg 1198.5 kg

Standard Aquarium Tank Sizes and Dimensions in Metric Units (cm, liters):

Small Fish Tank Sizes:

2.5 Gallon Tank Dimensions in cm

The 2.5-gallon tank has dimensions of 30.5 x 15.2 x 20.3 cm, holds 9.5 liters of water, weighs 1.2 kg when empty, and weighs 12.3 kg when filled with water.

5 Gallon Tank Dimensions in cm

The 5-gallon tank has dimensions of 40.6 x 21.6 x 26.7 cm, holds 18.9 liters of water, weighs 3.2 kg when empty, and weighs 28.2 kg when filled with water.

10 Gallon Tank Dimensions in cm

The 10-gallon tank has dimensions of 50.8 x 26.7 x 31.8 cm, holds 37.9 liters of water, weighs 5 kg when empty, and weighs 50.5 kg when filled with water.

15 Gallon Tank Dimensions in cm

The 15-gallon tank has dimensions of 61 x 31.8 x 34.9 cm, holds 56.8 liters of water, weighs 9.5 kg when empty, and weighs 77.1 kg when filled with water.

Medium Fish Tank Sizes:

20 Gallon Tall Tank Dimensions in cm

The 20-gallon (tall) tank has dimensions of 61 x 31.8 x 42.5 cm, holds 75.7 liters of water, weighs 11.3 kg when empty, and weighs 102.6 kg when filled with water.

20 Gallon Long Tank Dimensions in cm

The 20-gallon (long) tank has dimensions of 76.2 x 30.5 x 32.4 cm, holds 75.7 liters of water, weighs 11.3 kg when empty, and weighs 102.6 kg when filled with water.

29 Gallon Tank Dimensions in cm

The 29-gallon tank has dimensions of 76.2 x 31.8 x 47.6 cm, holds 113.6 liters of water, weighs 18.1 kg when empty, and weighs 149.7 kg when filled with water.

30 Gallon Breeder Tank Dimensions in cm

The 30-gallon (breeder) tank has dimensions of 91.4 x 31.8 x 42.6 cm, holds 113.6 liters of water, weighs 19.5 kg when empty, and weighs 155.7 kg when filled with water.

40 Gallon Breeder Tank Dimensions in cm

The 40-gallon (breeder) tank has dimensions of 91.4 x 45.7 x 43.2 cm, holds 151.4 liters of water, weighs 26.3 kg when empty, and weighs 208.7 kg when filled with water.

40 Gallon Long Tank Dimensions  in cm

The 40-gallon (long) tank has dimensions of 121.9 x 32.4 x 43.2 cm, holds 151.4 liters of water, weighs 24.9 kg when empty, and weighs 205.4 kg when filled with water.

Large Fish Tank Sizes:

50 Gallon Tank Dimensions in cm

The 50-gallon tank has dimensions of 91.4 x 45.7 x 48.3 cm, holds 189.3 liters of water, weighs 30.9 kg when empty, and weighs 272.2 kg when filled with water.

55 Gallon Tank Dimensions in cm

The 55-gallon tank has dimensions of 121.9 x 32.4 x 53.3 cm, holds 208.2 liters of water, weighs 35.4 kg when empty, and weighs 284.0 kg when filled with water.

60 Gallon Breeder Tank Dimensions in cm

The 60-gallon (breeder) tank has dimensions of 121.9 x 47.0 x 40.6 cm, holds 227.1 liters of water, weighs 40.8 kg when empty, and weighs 309.0 kg when filled with water.

75 Gallon Tank Dimensions in cm

The 75-gallon tank has dimensions of 121.9 x 47.0 x 53.3 cm, holds 283.9 liters of water, weighs 44.5 kg when empty, and weighs 355.2 kg when filled with water.

90 Gallon Tank Dimensions in cm

The 90-gallon tank has dimensions of 121.9 x 47.0 x 63.5 cm, holds 340.7 liters of water, weighs 61.7 kg when empty, and weighs 952.4 kg when filled with water.

125 Gallon Tank Dimensions in cm

The 125-gallon tank has dimensions of 182.9 x 47.0 x 58.4 cm, holds 473.2 liters of water, weighs 80.3 kg when empty, and weighs 635.8 kg when filled with water.

150 Gallon Tank Dimensions in cm

The 150-gallon tank has dimensions of 182.9 x 47.0 x 74.9 cm, holds 567.8 liters of water, weighs 127.8 kg when empty, and weighs 816.1 kg when filled with water.

180 Gallon Tank Dimensions in cm

The 180-gallon tank has dimensions of 182.9 x 62.2 x 64.8 cm, holds 681.5 liters of water, weighs 127.9 kg when empty, and weighs 952.4 kg when filled with water.

210 Gallon Tank Dimensions in cm

The 210-gallon tank has dimensions of 182.9 x 62.2 x 74.9 cm, holds 796.7 liters of water, weighs 155.7 kg when empty, and weighs 1119.5 kg when filled with water.

225 Gallon Tank Dimensions in cm

The 225-gallon tank has dimensions of 182.9 x 69.9 x 69.9 cm, holds 852.4 liters of water, weighs 180.1 kg when empty, and weighs 1198.5 kg when filled with water.

Selecting the Perfect Aquarium Size

When starting an aquarium, it’s important to choose the right size tank for your space, as well as the type of fish you want to keep. The tank should be proportionate to the room it will be in, and the stand should be sturdy and match the room’s decor.

It’s also crucial to consider the size of the fish you want to keep, as they need enough room to thrive and grow. A larger tank with a wider and longer shape, and a larger water surface area, will be better for the fish as it will allow for more fish and a better oxygen to gas ratio. It’s important to consider the placement, stand, and fish when selecting the right aquarium size.

What is a Good Aquarium Size for a Beginner?

Medium sized tanks, ranging from 20 to 40 gallons, are the perfect choice for beginners who want to start an aquarium hobby. These tanks offer a great balance of space and ease of maintenance, making them an ideal choice for those who are new to the hobby

The Best Aquarium Tank Sizes for Beginners include:

  • 20 gallon
  • 30 gallon
  • 40 gallon

What Equipment is Necessary for Beginners Setting up an Aquarium?

When setting up an aquarium, there are a few essential pieces of equipment that you will need in order to create a healthy and sustainable environment for your fish. From the tank itself to filtration systems and lighting, having the right equipment is crucial for maintaining the well-being of your aquatic pets.

Here is a list of some of the most important items:

  1. Tank: The tank itself is the most important piece of equipment. The size of the tank will depend on the type of fish and plants you want to keep, as well as the size of your space.
  2. Filter: A good filtration system is crucial for maintaining a healthy aquatic environment. A filter will remove debris, bacteria, and other harmful substances from the water.
  3. Heater: Fish need a consistent water temperature to thrive, so a heater is necessary to maintain the ideal temperature for your specific fish species.
  4. Lighting: Aquatic plants need light to grow and thrive, so a good lighting system is necessary. LED lights are a popular choice as they are energy efficient and last for a long time.
  5. Substrate: The substrate is the material that covers the bottom of the tank. It serves as a base for plants, and it can also provide a natural-looking environment for the fish.
  6. Decorations: Aquarium decorations, such as rocks, plants, and caves, can provide your fish with hiding places and a more natural environment.
  7. Water conditioner: Tap water contains chlorine and other chemicals that can be harmful to fish, so it’s important to use a water conditioner to make the water safe for your fish.
  8. Thermometer: It’s important to monitor the water temperature of your tank, a thermometer will help you do that.
  9. Test kit: to test the water parameters of your tank such as pH, Ammonia, Nitrite, Nitrate, to make sure it’s safe for your fish and plants.
  10. A net: to remove the fish from the tank for cleaning or other purposes.

Why a 20-40 Gallon Tank is the Best Choice for Beginner Aquarists

5 Reasons Why a 20-40 Gallon Tank is Best for Beginners:

  1. Space for a variety of fish and plants: Medium sized tanks offer enough space for a variety of different fish and plants, allowing you to create a diverse and interesting ecosystem. This can be a great way to learn about different species and how they interact with one another.
  2. Easy maintenance: Medium sized tanks are easy to clean and maintain, making them a great choice for beginners who may not have a lot of experience with aquariums. With a medium sized tank, you’ll be able to learn the basics of tank maintenance without feeling overwhelmed.
  3. Room for growth: Medium sized tanks offer enough space for your fish and plants to grow, so you won’t have to worry about upgrading to a larger tank as soon as your fish start to outgrow their current home. This can be a great way to learn about the growth rates of different species and how to care for them as they grow.
  4. Better water quality: Medium sized tanks offer a better water to fish ratio, which means the water quality will be better for the fish and will be less prone to toxic gas buildup. This is important for the health of your fish and can help prevent disease and other issues.
  5. Flexibility: Medium sized tanks offer a lot of flexibility when it comes to decorating and aquascaping. You’ll have enough space to create a unique and interesting environment for your fish.