When I was in my teens and early right into my aquarium journey i realized how much aquariums weigh with a near catastrophe!I had actually purchased a tiny 25 gallon aquarium as an update for my Tropical Fish and sat it on height of my drawer unit, similar to the smaller aquarium prior to it. No problems, right!?

Filled saltwater aquariums sweet 8.56 lb. / 3.88 kg every gallon and also 2.26 lb. / 1.03 kg every liter. Filled freshwater aquariums weigh 8.34 lb. / 3.78 kg per gallon and also 2.20 lb. / 1.00 kg per liter.The empty weight of the aquarium, stand, canopy, substrate, and rock is in addition to the water weight.

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My tiny 25 gallon freshwater aquarium weighed in in ~ close to 200lb. And also my cheap collection of drawers were no happy! native that allude on, every aquarium ns owned had the manufacturer’s recommended stand!

Aquarium Water Weights

Below is a guide to glass saltwater and freshwater aquarium weights by volume:

5 gal / 19 liters43 lb. / 16 kg42 lb. / 19 kg7 lb. / 3 kg
10 gal. / 38 liters87 lb. / 40 kg84 lb. / 38 kg11 lb. / 5 kg
15 gal. / 57 liters128 lb. / 58 kg125lb. / 56 kg19 lb. / 9 kg
20 gal. / 76 liters172 lb. / 77 kg167 lb. / 75kg25 lb. / 11 kg
25 gal. / 95 liters214 lb. / 96 kg209 lb. / 94 kg32 lb. / 15 kg
30 gal. / 114 liters257 lb. / 116 kg250 lb. / 113 kg42 lb. / 19 kg
35 gal. / 133 liters300 lb. / 150 kg292 lb. / 131 kg46 lb. / 21 kg
40 gal. / 152 liters342 lb. / 154 kg334 lb. / 150 kg56 lb. / 25 kg
45 gal. / 170 liters385 lb. / 173 kg375 lb. / 169 kg68 lb. / 31 kg
50 gal. / 190 liters428 lb. / 193 kg417 lb. / 188 kg70 lb. / 32 kg
55 gal. / 208 liters 471 lb. / 212 kg459 lb. / 206 kg78 lb. / 35 kg
65 gal. / 246 liters 556 lb. / 250 kg542 lb. / 244 kg90 lb. / 41 kg
75 gal. / 284 liters642 lb. / 289 kg626 lb. / 281 kg98 lb. / 44 kg
90 gal. / 341 liters770 lb. / 346 kg 751 lb. / 338 kg135 lb. / 61 kg
120 gal. / 455 liters1027 lb. / 462 kg1001 lb. / 450 kg191 lb. / 87 kg
150 gal. / 569 liters1284 lb. / 578 kg1251 lb. / 563 kg281 lb. / 127 kg
180 gal. / 682 liters 1541 lb. / 693 kg1501 lb. / 676 kg282 lb. / 128 kg
210 gal. / 796 liters1798 lb. / 809 kg1751 lb. / 788 kg343 lb. / 156 kg
240 gal. / 910 liters2054 lb. / 924 kg2002 lb. / 901 kg365 lb. / 166 kg
280 gal. / 1061 liters2397 lb. / 1079 kg2335 lb. / 1051 kg402 lb. / 182 kg
300 gal. / 1137 liters2568 lb. / 1156 kg2502 lb. / 1126 kg446 lb. / 202 kg

Once you have the weight of the water girlfriend will also need to add the empty load of the aquarium, the stand, the sand and the Live Rock/Dry absent you add to the system.

How to Accurately calculate Aquarium load & Volume

Calculating the weight and volume that your brand-new aquarium is really an easy and is crucial for you to know. Knowing the weight is one part, however when it comes to dosing and also treating your aquarium v medication, you need to recognize the volume in her system.

Knowing just how to calculation volume will also assist if you add on a future sump or frag tank to your system.


Calculating Aquarium Volume:


48″ x 18″ x 21″ = 18,144 Cubic Inches18,144 x 0.004 = 73 Gallons


122cm x 46cm x 53cm = 297,436 Cubic Centimeters297,436 / 1000 = 297 Liters

Calculating Aquarium Weight:


Volume ( Gallons ) x 8.56 for SaltwaterVolume ( Gallons ) x 8.34 for Freshwater73 Gallons x 8.56 = 625 lb. Saltwater73 Gallons x 8.34 = 609 lb. Freshwater


Volume ( Litres ) x 1.024 because that Saltwater Volume ( Litres ) x 1.000 for Freshwater

297 Litres x 1.024 = 304 kg for Saltwater297 Litres x 1.000 = 297 kg for Freshwater

Calculating custom Shaped Aquariums

It’s earlier to Math course Ladies & Gentlemen! Who deserve to remember areas and also volumes that shapes? It’s just the exact same here!

Calculate the areaCalculate the volumeCalculate the weight

Don’t worry I’m not going to it is in cruel and make you gain out the pen, document and calculator! over there is an amazing calculator the does it every for you!

Click below to visit the Volume Calculator

Once you have actually your volume, you deserve to use the equations over to aid you find out the weight. Nothing forget to include in the load of her sump if it is in the was standing too!

Floor Strength compelled For an Aquarium

When I was in the planning step of my aquarium ns knew it was going to it is in heavy. It’s only a 75 gallon aquarium, yet I knew it to be going to weigh around 650 lb., include the load of the stand, sand, and rock, it would be close to 750-800 lb.

The other factor to consider I had actually was that civilization like come look at your aquarium when you have guests, so now you have 4- 6 adults standing in the exact same area and you have now added another 800-1200 lb. In weight.

A full weight of approximately 2000 lb. In ~ an 8ft square area of my floor. I’m no structural engineer yet I want to understand the floor in my 100-year-old residence would take the load.

North American building Code

Below my aquarium, I had a basement with my floor joists gift 12″ apart. I researched and also found the by placing the aquarium together close come the outside wall surface this would certainly be the strongest suggest of the joists.Spanning as plenty of joists as you deserve to helps to distribute the pack too.

A inspect of your local structure codes will help you ascertain exactly what her floor should be able to support, yet in basic 12″ spans have to support approximately 40 pounds per square foot. This is a theoretical fill averaged end the entire floor within your room.

Your aquarium just takes increase a small part of the floor room and relying on where that floor space is, you may need to assistance the joists from listed below or have extr structure added to your joists.

If friend looking to download a big aquarium ns would imply you contact a structural technician to come and survey the location simply to it is in sure.

How To assistance Floor Joists because that An Aquarium

Most aquariums as much as the 120 Gallon size should be well in many homes. As soon as you start going increase from that size there space things you have the right to do to help support the floor under your aquarium, listed you can accessibility the area that course!

Place the aquarium close come an external wallPlace her aquarium across as numerous joists together you have the right to Install prevent or bridging in between your joists to prevent twisting
Joist Blocking and Bridging
Joist Sistering
Install Sister boards to increase individual joist strengthInstall assistance beams and posts under joists
Floor Joist Support

For my setup, i built secondary 2×4 frame and also placed that under mine joists to aid support the load, simply in case!


Aquariums In Condo’s and also Apartments

There are many aquarium owners who live in tower block who frequently ask this question. Is my aquarium too hefty for the concrete floor?As we all know concrete is incredibly strong and the floors that a residential and also commercial tower block are constructed to suit.

During mine research, every I have been maybe to discover is the they must accomplish the same 40 pounds every square foot loading together residential homes. I have personally seen huge aquariums end 120 gallons in offices and workplaces v no problems, yet that doesn’t typical anything!

Two points to take into consideration with tower buildings:

Have a structural technician come and also survey your room if she planning a big aquariumCheck v the rules and also regulations the the tower block owners. They may limit the size of the aquarium you deserve to install and also may call for you come have additional insurance to cover any leaks or damage.

Other Considerations

Many aquarium owners include a sump to their aquarium and also where do many of this sumps gain installed? In the stand, under the aquarium!

Now you have actually just added another 50 gallons the water and also 400 lb. To her 150 gallon reef tank system!

In every my year in this industry, I have not come throughout anyone who’s floor has collapsed, yet that’s no to say it has actually not happened. Like whatever else in this hobby, plan Is King!

The enlarge the tank you can afford come run, the healthier and much more stable it will certainly be for its inhabitants but, make certain your floor is may be to take it the load. The last thing you want is to discover out 5 years down the line the floor joists have actually started to split under her tank!

One last thing to take into consideration is if you room in an earthquake zone. Is your tank stable, will it rock, will certainly a dynamic pack of a rocking tank add additional tension to her stand and also floor structure?

These are simply somethings you could want to think about when to plan your following tank, together we all understand we nothing go down in tank sizes ;D

Further Reading

You may find the following write-ups helpful too:


Hi, I'm Richard and also I have been an avid aquarist for over 30 years through a enthusiasm for Saltwater Aquariums. I love to happen on my expertise to help others acquire the same amount a pleasure the end of this hobby as I do.View my about Me page to uncover out an ext about me & my combined reef aquarium.

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My name is Richard and I have been an avid aquarist because that over 25 years. My trip began, like countless others, with the introduction of 2 goldfish and a small aquarium. I was hooked!It took me years of searching to help find every the best information to help me become successful v a Saltwater Aquarium.This website is design to placed all that valuable information in one easy-to-find place.