IKEA shelf boards: BILLY, PAX (KOMPLEMENT) and IVAR shelf sizes and thickness — dimension sheet Source: Xem Studio, https://xemstudio.com/objects/ikea-shelf-boards/ (sheet CC BY 4.0) Basis: IKEA product pages (Measurements section), cited per shelf; hole size and pitch are not published by IKEA Catalog version: 2026-10-20 Sizes: see table below - 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. 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 — Files elsewhere (not hosted by Xem Studio; license as stated by the publisher): - IKEA: BILLY shelf 76×26 (product page, Measurements) — web — Publisher's page; dimensions are facts — https://www.ikea.com/ae/en/p/billy-shelf-white-10525272/ - IKEA: BILLY shelf 36×26 (product page, Measurements) — web — Publisher's page; dimensions are facts — https://www.ikea.com/ca/en/p/billy-shelf-white-70525269 - IKEA: KOMPLEMENT shelf 50×35 (product page, Measurements) — web — Publisher's page; dimensions are facts — https://www.ikea.com/cz/en/p/komplement-shelf-dark-grey-20509455/ - IKEA: KOMPLEMENT shelf 75×35 (product page, Measurements) — web — Publisher's page; dimensions are facts — https://www.ikea.com/sg/en/p/komplement-shelf-white-50277996/ - IKEA: KOMPLEMENT shelf 100×35 (product page, Measurements) — web — Publisher's page; dimensions are facts — https://www.ikea.com/cz/en/p/komplement-shelf-dark-grey-90509452/ - IKEA: KOMPLEMENT shelf 50×58 (product page, Measurements) — web — Publisher's page; dimensions are facts — https://www.ikea.com/sg/en/p/komplement-shelf-white-10277960/ - IKEA: KOMPLEMENT shelf 75×58 (product page, Measurements) — web — Publisher's page; dimensions are facts — https://www.ikea.com/my/en/p/komplement-shelf-grey-beige-50509048/ - IKEA: KOMPLEMENT shelf 100×58 (product page, Measurements) — web — Publisher's page; dimensions are facts — https://www.ikea.com/bh/en/p/komplement-shelf-grey-beige-40509039/ - IKEA: IVAR shelf 42×30 (product page, Measurements) — web — Publisher's page; dimensions are facts — https://www.ikea.com/ie/en/p/ivar-shelf-pine-10318159/ - IKEA: IVAR shelf 83×30 (product page, Measurements) — web — Publisher's page; dimensions are facts — https://www.ikea.com/ae/en/p/ivar-shelf-pine-30318163 - IKEA: IVAR shelf 83×50 (product page, Measurements) — web — Publisher's page; dimensions are facts — https://www.ikea.com/gb/en/p/ivar-shelf-pine-80318165/ - IKEA: KALLAX shelving unit 77×77 (no interior listed) (product page, Measurements) — web — Publisher's page; dimensions are facts — https://www.ikea.com.tw/en/products/sideboards/open-shelving-units/kallax-art-70351886 No true-size file yet: the published figures do not fix the whole shape; a measured scan is planned. API: https://xemstudio.com/api/geometry?object=ikea-shelf-boards