ᐅ Which Billy bookcases are especially sturdy for heavy books?

Hello everyone,

I am planning to buy several Billy bookcases from IKEA to store a rather extensive collection of heavy technical books. My main concern is the load capacity of the individual bookcases and shelves. Which versions of the Billy bookcases (standard, reinforced, with metal supports, or similar) are especially suitable for heavy books? Are there any recommendations regarding the maximum load per shelf or practical tips on how to ensure long-term stability? Experience with additional reinforcements, shelf inserts, or modifications would also be very helpful.

Thanks in advance for your input!

traonur schrieb:
My main concern is the load-bearing capacity of the individual shelves and panels.

This is something many people underestimate. The standard Billy shelves are fine for light to medium-weight books, but if you put really heavy volumes on them, it quickly becomes problematic. The shelves tend to sag, especially on wider units.

I believe we should stop treating IKEA shelves as a one-size-fits-all solution. The reinforced Billy versions with metal supports are indeed better, but if you want to store truly heavy books, you almost always need to reinforce them further.

Interestingly, IKEA claims the shelves can hold up to 30 kg (66 lbs) per panel – realistically, it’s more like 15–20 kg (33–44 lbs) without sagging.

My advice: buy more shelves with narrower compartments and definitely add metal strips or extra supports. That makes all the difference.

kemeo68 schrieb:
The shelves bow, especially on wider units.

That’s exactly right; the bending of the shelves is the main weak point. If I may explain the issue of load-bearing Billy-style shelves for heavy books from a technical perspective:

The standard particleboard shelves in these units are about 16 mm (0.6 inches) thick, which is structurally sufficient for normal books. However, when loaded with heavier volumes (e.g., reference books, encyclopedias, etc.), particularly over a length of 80-90 cm (31-35 inches), noticeable sagging begins.

The reinforced shelves with metal supports (available for the so-called "BILLY/BESTÅ combination" or as an upgrade) increase load capacity, as the aluminum profile evenly distributes the weight.

A general rule of thumb for load is approximately 15-20 kg (33-44 lbs) per shelf for standard boards, and up to about 40 kg (88 lbs) for shelves supported by metal brackets.

I also recommend choosing the narrower versions where possible (around 40 cm (16 inches) deep instead of 80 cm), since reduced overhang drastically decreases sagging.

If needed, an additional MDF panel can be installed as reinforcement, resting on the metal supports.

One more question: How wide are the shelves planned to be? How many shelves per unit do you intend to use, and what is the average weight of the books? That way, a more specific recommendation can be given.

glamo schrieb:
I also recommend choosing the narrower options whenever possible (about 40cm (16 inches) depth instead of 80cm (31 inches)).

Exactly, narrower means more stability.

Additionally, installing metal supports significantly increases load capacity.

Avoid experimenting with wide shelves; they tend to bend very quickly.