# IKEA shelf boards: BILLY, PAX (KOMPLEMENT) and IVAR shelf sizes and thickness

> What size are IKEA BILLY, PAX and IVAR shelves?

- Category: Home & kitchen › Household
- Kind: Modern device
- Basis: IKEA product pages (Measurements section), cited per shelf; hole size and pitch are not published by IKEA
- Page: https://xemstudio.com/objects/ikea-shelf-boards/ · JSON: https://xemstudio.com/api/geometry?object=ikea-shelf-boards · Plain text: https://xemstudio.com/objects/ikea-shelf-boards/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); files CC BY 4.0 or their publisher's license
- Use in every chat: add https://xemstudio.com/mcp as a connector (https://xemstudio.com/use-with-ai/)

**Exact dimensions.** True size, with no printing tolerance added.

## Notes

- The whole bookcase or wardrobe is not something you design around; the shelf board is. These are the boards as IKEA's product pages list them (width × depth × thickness, mm). Use them for shelf dividers, clip-on bins, under-shelf drawers, edge-clamp hooks and replacement boards.
- BILLY shelves are 20 mm thick; KOMPLEMENT (PAX) and IVAR shelves are 18 mm. IKEA notes the current BILLY shelf does not fit bookcases bought in spring 2014 or earlier.
- KOMPLEMENT widths are the frame width minus 39 mm (50 → 461, 75 → 711, 100 → 961) and depths the frame depth minus 2 or 7 mm, as listed per size.
- Not published by IKEA, so not drawn: shelf-pin hole diameter, hole pitch and hole rows in the side panels, the KALLAX cube interior and panel thickness. Owners report 5 mm holes on a 32 mm pitch for BILLY (see the 5 mm shelf pins page); measure your own unit once before drilling or printing a hole-pattern guide.
- Max load is IKEA's per-shelf figure with the load spread evenly.

## Sizes

| shelf | W × D × thickness (mm) | fits | max load |
|---|---|---|---|
| BILLY shelf 76×26 | 760 × 260 × 20 | BILLY 80 wide, 28 deep | 30 kg |
| BILLY shelf 36×26 | 360 × 260 × 20 | BILLY 40 wide, 28 deep | 14 kg |
| KOMPLEMENT shelf 50×35 (PAX) | 461 × 348 × 18 | PAX frame 50 × 35 | 12 kg |
| KOMPLEMENT shelf 75×35 (PAX) | 711 × 348 × 18 | PAX frame 75 × 35 | 12 kg |
| KOMPLEMENT shelf 100×35 (PAX) | 961 × 348 × 18 | PAX frame 100 × 35 | 12 kg |
| KOMPLEMENT shelf 50×58 (PAX) | 461 × 573 × 18 | PAX frame 50 × 58 | 20 kg |
| KOMPLEMENT shelf 75×58 (PAX) | 711 × 573 × 18 | PAX frame 75 × 58 | 20 kg |
| KOMPLEMENT shelf 100×58 (PAX) | 961 × 573 × 18 | PAX frame 100 × 58 | 20 kg |
| IVAR shelf 42×30 | 420 × 300 × 18 | IVAR side unit 30 deep | 18 kg |
| IVAR shelf 83×30 | 830 × 300 × 18 | IVAR side unit 30 deep | 35 kg |
| IVAR shelf 83×50 | 830 × 500 × 18 | IVAR side unit 50 deep | 45 kg |
| KALLAX cube opening | not published by IKEA | inserts are 330 × 370 × 330 (see the KALLAX page) | 13 kg per shelf |
| shelf-pin hole Ø and vertical pitch (all four) | not published by IKEA | measure your unit once | — |

## Where the files are

- IKEA: [BILLY shelf 76×26 (product page, Measurements)](https://www.ikea.com/ae/en/p/billy-shelf-white-10525272/) — web — Publisher's page; dimensions are facts
- IKEA: [BILLY shelf 36×26 (product page, Measurements)](https://www.ikea.com/ca/en/p/billy-shelf-white-70525269) — web — Publisher's page; dimensions are facts
- IKEA: [KOMPLEMENT shelf 50×35 (product page, Measurements)](https://www.ikea.com/cz/en/p/komplement-shelf-dark-grey-20509455/) — web — Publisher's page; dimensions are facts
- IKEA: [KOMPLEMENT shelf 75×35 (product page, Measurements)](https://www.ikea.com/sg/en/p/komplement-shelf-white-50277996/) — web — Publisher's page; dimensions are facts
- IKEA: [KOMPLEMENT shelf 100×35 (product page, Measurements)](https://www.ikea.com/cz/en/p/komplement-shelf-dark-grey-90509452/) — web — Publisher's page; dimensions are facts
- IKEA: [KOMPLEMENT shelf 50×58 (product page, Measurements)](https://www.ikea.com/sg/en/p/komplement-shelf-white-10277960/) — web — Publisher's page; dimensions are facts
- IKEA: [KOMPLEMENT shelf 75×58 (product page, Measurements)](https://www.ikea.com/my/en/p/komplement-shelf-grey-beige-50509048/) — web — Publisher's page; dimensions are facts
- IKEA: [KOMPLEMENT shelf 100×58 (product page, Measurements)](https://www.ikea.com/bh/en/p/komplement-shelf-grey-beige-40509039/) — web — Publisher's page; dimensions are facts
- IKEA: [IVAR shelf 42×30 (product page, Measurements)](https://www.ikea.com/ie/en/p/ivar-shelf-pine-10318159/) — web — Publisher's page; dimensions are facts
- IKEA: [IVAR shelf 83×30 (product page, Measurements)](https://www.ikea.com/ae/en/p/ivar-shelf-pine-30318163) — web — Publisher's page; dimensions are facts
- IKEA: [IVAR shelf 83×50 (product page, Measurements)](https://www.ikea.com/gb/en/p/ivar-shelf-pine-80318165/) — web — Publisher's page; dimensions are facts
- IKEA: [KALLAX shelving unit 77×77 (no interior listed) (product page, Measurements)](https://www.ikea.com.tw/en/products/sideboards/open-shelving-units/kallax-art-70351886) — web — Publisher's page; dimensions are facts

## Questions

**How thick are IKEA shelves?**

BILLY shelves are 20 mm; KOMPLEMENT (PAX) and IVAR shelves are 18 mm (IKEA product pages).

**What size is a PAX shelf?**

KOMPLEMENT shelves are 461, 711 or 961 mm wide (50, 75, 100 frames), 348 deep for 35 cm frames or 573 deep for 58 cm frames, 18 mm thick.

**What is the shelf-pin spacing on IKEA bookcases?**

IKEA does not publish it. BILLY owners report 5 mm holes on a 32 mm pitch; measure yours.

## Fits with

- [IKEA BILLY bookcase dimensions (80 and 40 wide, 202 and 106 tall) and shelf sizes](https://xemstudio.com/objects/ikea-billy/)
- [IKEA KALLAX shelving unit dimensions (1x4, 2x2, 2x4, 4x4, 5x5) and the inserts and boxes that fit](https://xemstudio.com/objects/ikea-kallax/)
- [Shelf support pins for 5 mm holes (32 mm system), plain and L-ledge](https://xemstudio.com/objects/shelf-pins-5mm/)
- [Furniture dowels Ø6, Ø8, Ø10 × 30–40 mm (the 8 × 30 flat-pack dowel)](https://xemstudio.com/objects/furniture-dowels/)
- [Cam lock connectors Ø15 (Minifix-type): drilling table, housing clearance, hole caps](https://xemstudio.com/objects/cam-lock-15mm/)