ᐅ Combining Kallax units and tabletops – how stable is it?

Hello everyone,

I am currently planning to use several Kallax shelves from IKEA as the base for custom-made tables. Each Kallax unit will support a separate tabletop to create an affordable yet stylish table solution. My main question is: How stable is this kind of construction under normal use?

Specifically, I mean whether the Kallax units provide enough strength as a base to support a tabletop made of wood or MDF—even when subjected to workload, occasional placement of heavier objects, and even a few instances of leaning or pressing lightly on the tabletop.

What are your experiences or knowledge on this? Are there important points I should consider when combining Kallax units with tabletops to ensure the whole setup remains safe and stable over the long term? Also, what are suitable connection methods (screws, clamps, brackets, etc.)?

Thanks for your advice!

The Kallax shelves are sturdy enough to support many tabletops but should be securely fastened. I recommend screws or strong brackets to firmly attach the tabletop. The load is distributed to the legs, meaning the shelves themselves are load-bearing.

Basically, the Kallax system with its frame structure provides sufficient load-bearing capacity for tabletops made of medium-density wood-based panels or even solid wood, as long as a few aspects are considered:

1. Connection: The most stable option is a mechanical attachment, e.g., with brackets and screws, especially at the corners of the Kallax units. This prevents tipping and shifting of the tabletop.
2. Load distribution: A thicker, stiffer tabletop (at least 18mm (0.7 inches)) ensures better load distribution. Thin chipboard tends to bend.
3. Base: The Kallax units should stand stable and level on the floor to avoid an unstable foundation.
4. Load: For normal loads (working, laptop, books), the Kallax is sufficient. For heavier loads, additional reinforcements may be necessary.

In summary: This combination is well feasible for private use, provided that the attachment and tabletop are appropriately chosen.

I used a Kallax unit as a table base myself. Important: make sure to screw it in rather than just placing the tabletop on it. Otherwise, it will wobble easily. Plastic feet screwed underneath the shelf can also help provide stability.

barda6 schrieb:
The Kallax shelves are sturdy enough for many tabletops but should be securely fixed.

That is basically correct. Additionally, I would like to point out that the structural advantage of the Kallax shelf lies in its frame-like design, which allows for good load-bearing capacity and an even distribution of forces.

Although the load capacity of a single Kallax shelf is, according to the manufacturer, up to 13–15 kg (28–33 lbs) internally and 20–30 kg (44–66 lbs) per unit externally, the load capacity as a table base is higher because the tabletop distributes the load evenly over the entire surface.

However, the connection between the tabletop and the Kallax should be designed to prevent lateral slipping or wobbling. Screws with angle brackets are optimal solutions, as they also counteract leverage forces.

Furthermore, the choice of tabletop should be adapted to the intended use. A sturdy plywood or MDF board at least 18 mm (0.7 inches) thick improves overall stability more than simple particleboard. If dynamic loads or high pressure are applied frequently, it may be advisable to add cross braces or a substructure.

Giagau schrieb:
Design the connection between the tabletop and the Kallax unit in a way that prevents lateral slipping or wobbling.

Thank you for this clarification; it was one of my main concerns. Are there any experiences or recommendations on how to best align and connect multiple Kallax units under a large tabletop so that the entire structure remains stable and user-friendly, while still maintaining flexibility and the modular concept?

I have considered placing the tabletop across two Kallax shelves, securing them with brackets to the shelves, and also connecting the shelves to each other somehow, for example with metal profiles or clamping systems.

Would such a solution be practical? Or does securing the shelves to the tabletop alone already prevent them from slipping?