---
title: "IKEA Kallax Cushion Size: 15⅜ x 57⅝ in for the Long Unit"
url: "https://cushionguide.com/answers/cube-shelf-bench-cushion-size/"
section: "The Cutting Table"
author: "Hana Lindqvist, The Quiet Geometer of Seattle"
author_url: "https://cushionguide.com/masters/hana/"
published: "2026-07-06"
updated: "2026-07-06"
keywords: "ikea kallax cushion size, kallax bench cushion, kallax on its side seat cushion, 2x2 kallax cushion size, cushion for top of kallax"
---

# What size cushion fits on top of an IKEA Kallax used as a bench?

*The numbers in the product name describe a shelf standing up. Lay it down and they change jobs.*

Also asked as: Kallax bench cushion size; Kallax on its side as a seat

> **The quick answer:** A long 1x4 IKEA Kallax laid on its side has a top of about 15⅜ x 57⅝ in (39 x 146.5 cm), and that is the cushion size. The square 2x2 unit's top is about 15⅜ x 30⅛ in (39 x 76.5 cm). The 16⅜ in in the product title becomes the bench height. Measure your own unit first, since IKEA sizes vary by country.

![Charcoal taupe linen-look seat cushion and tall box backrest with ivory piping on a mudroom bench above shoe cubbies](https://cushionguide.com/media/bench-cushions/dark-taupe-mudroom-bench-cushion-ivory-piping-1600.webp "A built-in entry bench with shoe cubbies below gets a thick taupe seat and a tall leaning backrest, both outlined in ivory piping.")

## Key facts

- The 16⅜ x 57⅝ in in the KALLAX title is width x height, not the seat surface.
- A 1x4 Kallax on its side has a top of about 15⅜ x 57⅝ in (39 x 146.5 cm).
- On its side, the 16⅜ in (about 42 cm) becomes the bench height.
- A 2x2 Kallax top is about 15⅜ x 30⅛ in (39 x 76.5 cm).
- The listing option reads '15x57 in - Ikea Kallax' because of character limits, but is made at 15¼ x 57¾ in (39 x 146.5 cm).
- IKEA dimensions vary by country; measure your own unit.

## The title numbers are standing up

The 16⅜ x 57⅝ in printed with the product name is width by height. It describes the shelf upright, against a wall.

Tip it onto its long side and the numbers trade places. The 57⅝ in becomes the bench's length. The 15⅜ in shelf depth becomes the seat depth. The 16⅜ in width becomes the height you sit at. So the cushion is about 15⅜ x 57⅝ in (39 x 146.5 cm), not 16⅜.

The [IKEA Kallax cushions](https://cushionguide.com/cushions/ikea-kallax-cushions/) hub collects the common builds, the [Kallax sizes Pattern](https://cushionguide.com/guides/ikea-kallax-bench-cushion-sizes/) goes deeper into thickness, and [Kallax bench builds](https://cushionguide.com/concepts/kallax-bench-cushion-builds/) shows them in real rooms. Which one do you have, the long unit or the square one?

Standing, it holds books.
Lying down, it holds you.
The tape measure notices the difference.

## Two Kallax units, two tops

| Unit | Top on its side | How to order |
|---|---|---|
| Long 1x4 | About 15⅜ x 57⅝ in (39 x 146.5 cm) | The '15x57 in - Ikea Kallax' option, made at 15¼ x 57¾ in (39 x 146.5 cm) |
| Square 2x2 | About 15⅜ x 30⅛ in (39 x 76.5 cm) | Write the size in personalization |

## Before you order

- ✓ Confirm which unit you own: buyers call both the 1x4 and the 2x2 a '4-cube'
- ✓ Measure the top of your own unit; IKEA sizes vary by country
- ✓ Choose the Kallax option on the [window seat cushion](https://cushionguide.com/cushions/window-seat-cushions/) listing
- ✓ If your top measures differently, write the real size in personalization
- ✓ Ordering for several units? Ask for them to be quoted together

> **Tailor's margin:** An IKEA Kallax on its side is a bench about 16⅜ in (42 cm) tall; the cushion covers a top of about 15⅜ x 57⅝ in (39 x 146.5 cm).

> The 16⅜ x 57⅝ in on an IKEA Kallax is width by height; laid on its side as a bench, the seat top is about 15⅜ x 57⅝ in.
>
> — Hana

## Buyer questions

**A common question:** What size cushion do I need for a KALLAX used as a bench?

**The workshop's answer:** The 16⅜ x 57⅝ in in the product title is width x height. Laid on its side, the top is usually 57⅝ in long x 15⅜ in deep (146.5 x 39 cm), and the 16⅜ in becomes the bench height. Measure your own unit, as IKEA dimensions vary by country.

**A common question:** What size fits on top of a 4-cube Kallax?

**The workshop's answer:** A long 4-cube Kallax top is about 15 x 57 in (39 x 146.5 cm). At the time, the shop said to pick the 16 x 59 in option and it would be made to the exact Kallax size; there is now a dedicated Kallax option.

**A common question:** What sizes fit the long Kallax and the smaller square one?

**The workshop's answer:** The shop made 15¼ x 57¾ in (39 x 146.5 cm) cushions for the long unit and 15⅜ x 30⅛ in (39 x 76.5 cm) for the square one, and quoted all three cushions together. Order through the IKEA Kallax option on the window seat cushion listing.

**A common question:** Can you make a cushion for the top of a Kallax unit?

**The workshop's answer:** Yes, to the exact 15⅜ x 57⅝ in (39 x 146.5 cm). The option reads '15x57 in - Ikea Kallax' because of character limits, but the cushion is made to the full measurement.

## Questions buyers ask next

### Why is the Kallax option labeled 15x57 in?

Character limits on the listing. The option reads '15x57 in - Ikea Kallax', but the cushion is made to the full 15¼ x 57¾ in (39 x 146.5 cm), which is 15⅜ x 57⅝ in. You don't need to add the fractions yourself.

### How tall is a Kallax bench once it lies on its side?

About 16⅜ in (42 cm) before the cushion, because the unit's width becomes its height. Add the cushion thickness, minus a little compression when you sit, to find your real seat height.

### Which Kallax do buyers mean when they say 4-cube?

Either one, which is the trouble. Buyers use '4-cube' for the long 1x4 unit and for the square 2x2, and their tops differ: about 57⅝ in long against about 30⅛ in. Say which you have, or send measurements.

## Related at the atelier

- [IKEA Kallax bench cushion sizes for every unit and combined run](https://cushionguide.com/guides/ikea-kallax-bench-cushion-sizes/): A Kallax bench cushion is 15 3/8 in (39 cm) deep on every unit, because every Kallax is 15 3/8 in deep.
- [Can you make one cushion for Kallax units placed side by side?](https://cushionguide.com/answers/cube-shelf-banquette-window-seat-cushion/): One Kallax window seat cushion can span units placed side by side: measure the whole run and the cushion is made to that length.
- [Kallax Bench Cushion in Forest Green, Cut to the Eighth Inch](https://cushionguide.com/readings/forest-green-kallax-bench-cushion-books-board-games/): A Kallax bench cushion should be cut to the exact footprint of the unit's top, measured to the nearest 1/8 in, so the shelf edge disappears and it reads as a bench.
- [Kallax bench ideas, seven ways: from kids' rooms to kitchen banquettes](https://cushionguide.com/concepts/kallax-bench-cushion-builds/): A Kallax bench cushion for the long 1x4 unit laid on its side is about 15 3/8 x 57 5/8 in (39 x 146.5 cm), and the square 2x2 top is about 15 3/8 x 30 1/8 in (39 x 76.5 cm).
- [Can I pay extra to rush my custom cushion order?](https://cushionguide.com/answers/rush-custom-cushion-order-priority-production/): Often, yes: paid priority production moves your custom cushion order to the front of the queue so it reaches the carrier sooner.
- [How can I match a new cushion to pillows or furniture I already have?](https://cushionguide.com/answers/match-cushion-fabric-to-existing-furniture/): Order physical samples of your shortlisted codes and hold them against your pillows, storage bins or paint at home, in your own light; that is the reliable way to match existing furniture.
- [One long cushion or two? Splitting a long bench or window seat](https://cushionguide.com/guides/long-bench-cushion-one-piece-or-two/)

*— Hana*

---

Written by Hana Lindqvist (https://cushionguide.com/masters/hana/) for CushionGuide (https://cushionguide.com/about/). The site explains made-to-measure cushions and the partner workshop makes them; measurements are in inches first. This Markdown mirrors the page at https://cushionguide.com/answers/cube-shelf-bench-cushion-size/