ᐅ Billy Regal shelves and load capacity – exact figures?

Hello everyone,

I have a question about the load capacity of the shelves in the IKEA Billy bookcase. Different sources provide varying figures; some mention a maximum of 10 kg (22 lbs) per shelf, while others claim it can easily hold up to 30 kg (66 lbs). I’m interested in the exact values you know or can confirm from your own experience. It’s especially important for me to understand how the load capacity changes with different shelf widths (such as 40 cm (16 inches) vs. 80 cm (31 inches)) or depending on the material composition (chipboard, lacquered surface). The depth of the shelves also matters to me.

Can anyone provide specific numbers, preferably with information about the test conditions (point load test, distributed load, factors like how the shelves are supported)? I want to avoid the shelves sagging excessively or even breaking, since I plan to use them for a heavy collection (books, binders, etc.).

Thanks in advance for your insights!

julianaix5 schrieb:
I have a question regarding the load capacity of the shelves in the IKEA Billy bookcase.

It’s interesting that you’re considering this so carefully – in my opinion, the manufacturer’s specifications are often set too low. IKEA officially states about 13 kg per shelf, but I have loaded shelves with 25 kg before, and of course, it also depends on how the shelf is used.

However, caution is advised: the wider the bookcase, the more the shelf will bend. For an 80 cm (31.5 inch) wide unit, I would definitely recommend additional support if you’re placing anything heavy on it. The official figures are often based on a centered point load test – in reality, loads are distributed differently.

You could almost say that Billy shelves are only half as weak as some users believe – especially if you don’t fully load the shelf.

The official IKEA data for shelf load capacity usually indicates about 13 kg (29 lbs) per shelf for standard shelves. For a width of 40 cm (16 inches), this can be used as a guideline. For 80 cm (31 inches), you should plan for around 10-12 kg (22-26 lbs) to avoid bowing.

luAlbert1 schrieb:
IKEA officially states about 13 kg per shelf

Thanks for the information; that’s a helpful reference point.

However, I wonder if this 13 kg refers to a completely sag-free load or just a minimal load before visible deflection starts. Especially for books and binders, 13 kg per shelf might become a tight limit on larger models.

SETHBLA schrieb:
For 80 cm (31.5 inches), you should plan for about 10-12 kg (22-26 lbs) to avoid sagging.

Could someone explain more precisely how these values are determined? How much weight can a shelf hold before permanent deformation occurs over time? Are these based on standardized static load tests? I’m also interested in the differences depending on whether the shelves are secured with pins inside the unit or just resting on supports.

I am looking for a precise statement, for example, “Load capacity X kg (for 80 cm (31.5 inches) width), under uniformly distributed load, measured according to DIN/ISO standards.” Has anyone conducted such tests themselves using measuring devices or similar equipment?

The official load capacity is determined through tests with an evenly distributed load, which for IKEA shelves is usually specified by the manufacturer as 13 kg per shelf.

For a width of 80 cm (31.5 inches), experts often recommend an additional center support or middle support strip to prevent sagging.

Even sturdy particle boards will bend under excessive weight. Whether fixed in place or simply resting, the load limit remains similar; the difference is mainly in reducing wobbling.

With a Billy shelf (standard shelf board), you can typically expect it to hold around 10-15 kg (22-33 lbs) per shelf without noticeable sagging. Wider shelves, however, are more prone to bending because the load on the particleboard is greater. If you need to support more weight, it's recommended to use additional supports or switch to thicker shelf boards.