ᐅ Kallax Shelf as Aquarium Stand – Should I Check the Structural Stability?

Hello everyone,

I am planning to use my Ikea Kallax shelf as a base cabinet for an aquarium. The aquarium will be approximately 120cm (47 inches) long, with a volume of about 180 liters (48 gallons). Now I am wondering how to reliably check the structural integrity and load-bearing capacity of the Kallax shelf before placing the tank on it.

I am particularly interested in understanding whether the Kallax can truly support the weight and what to look out for when assessing its structural stability. Does anyone know specific values or a general rule of thumb for its load capacity? Do I need to add any additional reinforcements to ensure long-term stability?

I would appreciate tips on how to proceed and advice on how to handle similar constructions.

Best regards!

The Kallax shelf is not specifically designed for heavy loads. The maximum load capacity per compartment is about 13-15 kg (29-33 lbs). However, an aquarium with water and decorations can quickly weigh 200 kg (440 lbs) or more on the surface.

Therefore, I would definitely recommend planning for an additional base or reinforcement, such as a thick sheet of OSB or plywood as a support surface, which will distribute the weight more effectively.

Hello Litan60,

I’m happy to give you a detailed explanation on how to check the structural stability of your Kallax shelf for an aquarium:

1. Assess load capacity: The most important thing is to know how much weight the shelves and frame can support. Ikea states about 13–15 kg (29–33 lbs) per shelf for Kallax, which is usually not enough for aquariums.

2. Determine total weight: One liter of water weighs 1 kg (2.2 lbs). Your 180-liter (48-gallon) tank plus equipment and decorations will exert around 200–220 kg (440–485 lbs) on the support surface. The load is concentrated on a few points, so the shelf must be able to evenly carry this weight.

3. Improve load distribution: Use a sturdy support board (e.g., 18 mm (0.7 inches) multiplex plywood). This spreads the weight across the entire compartment and reduces point loads on the shelf structure.

4. Add reinforcements: Since the vertical supports of the Kallax are not designed for such heavy loads, you can attach metal brackets or wooden strips to stabilize the frame.

5. Perform a load test: Before placing the real aquarium, you can test the shelf with appropriate weights (e.g., sandbags or water bags) to check if it holds the load without sagging or becoming unstable.

Summary: Kallax is generally not designed for aquariums over about 50 kg (110 lbs), but with a suitable solid support board and reinforcements, it may be possible. Careful load distribution is essential. Safety first!

I hope this helps you!

anfeteo schrieb:
Kallax is basically not designed for aquariums over approximately 50 kg

The load capacity specifications for the Kallax are important. Official data from Ikea indicates that each individual compartment can support a maximum of 13–15 kg (29–33 lbs), which is clearly exceeded by an aquarium of around 180 liters (47 gallons).

Regarding structural integrity: The main issue is not only the weight but also how that weight is distributed. The Kallax shelf is made from medium-density fiberboard (MDF) and has several open compartments that are not designed for high point loads.

For safe use as an aquarium stand, the following measures are recommended:

- A continuous, load-bearing base made of plywood or OSB with a minimum thickness of 18 mm (0.7 inches) as a load distributor.
- Reinforcement of the side and internal structure (e.g., with additional battens or brackets).
- Ensuring the shelf is placed on a level, solid floor.

If you want to use it without reinforcements, the risk of deformation or even structural failure is high. A load test with a similar weight can be simulated using sandbags.

In conclusion: If the shelf is to be economically and visually suitable, the above reinforcements are essential. Alternatively, investing in a purpose-built aquarium stand is worthwhile.