---
title: "IKEA Kallax Cushions Cut to the Real Bench Top: Sizes, Fabric"
url: "https://cushionguide.com/cushions/ikea-kallax-cushions/"
section: "The Cushion Atlas"
author: "Hana Lindqvist, The Quiet Geometer of Seattle"
author_url: "https://cushionguide.com/masters/hana/"
published: "2026-01-28"
updated: "2026-09-24"
keywords: "kallax cushion, kallax bench cushion, ikea kallax cushion, kallax cushion 15 x 57, kallax window seat cushion, kallax banquette cushion, custom kallax cushion"
---

# Kallax cushions for IKEA benches, cut to the top you actually sit on

*A Kallax on its side is a bench waiting for a seat, and the number on the box describes the unit standing up. Measure the top instead, and the rest is quiet work.*

> **The quick answer:** A Kallax bench cushion is cut to the unit's top as it lies: about 15 3/8 x 57 5/8 in (39 x 146.5 cm) for a long 1x4 on its side, not the 16 3/8 x 57 5/8 in on the box. A 2x2 top is about 15 3/8 x 30 in. Standard foam is 4 in, under a zippered cover. Measure your own unit first.

![Forest green piped cushion on a white two-cube IKEA Kallax, with books and board games stored in the cubes below](https://cushionguide.com/media/ikea-kallax-cushions/forest-green-kallax-bench-cushion-books-board-games-1600.webp "A made-to-fit pad turns a two-cube shelf into seating while the cubes keep books and board games within reach.")

## A shelf on its side, waiting for a seat

Lay a Kallax on its side and it becomes a low bench with storage underneath. Books, bins and board games go in the cubes. A cushion goes on top. People build them in kids' rooms, under windows and as kitchen banquettes.

A Kallax bench cushion is a flat foam cushion cut to that top. It is one of the simpler shapes in the atlas. The difficult part is the number, because the one on the box describes the unit standing up.

Which Kallax do you have, and which way does it lie? Answer that first. For seats built into a wall instead, see [window seat cushions](https://cushionguide.com/cushions/window-seat-cushions/) and [kitchen nook cushions](https://cushionguide.com/cushions/kitchen-nook-cushions/).

IKEA and Kallax are trademarks of Inter IKEA Systems B.V.; CushionGuide and its partner workshop are not affiliated with IKEA.

## The tops, measured

|   |   |
|---|---|
| Long 1x4, on its side | Top about 15 3/8 x 57 5/8 in (39 x 146.5 cm). The 16 3/8 in becomes the bench height. |
| Square 2x2 | Top about 15 3/8 x 30 in (39 x 76.5 cm) |
| The box label | 16 3/8 x 57 5/8 in is width x height of the unit standing up, not the seat |
| Units side by side | Measure the whole run; one cushion is made to it. A long 1x4 plus a single cube came to 15 3/8 x 74 3/8 in (39 x 189 cm). |
| Precision | To the nearest 1/8 in. Fractions are cut as given; there is no need to round. |
| Labels | Length is the long side, left to right. Width is front to back, the seat depth. |
| Thickness | 4 in (10 cm) standard; 3 in for a lower, neater line; 2 in (5 cm) is the thinnest standard foam |
| Cover | Zippered and removable; on bench covers the zipper often runs around two corners |
| Grip | Optional non-slip base in place of the bottom panel; holds by friction, no adhesive |
| Country | IKEA dimensions vary by country. Check your own unit before ordering. |

## Square corners, one clean edge

A Kallax cushion is a rectangle with square corners, because the shelf is. Most are box-edged, with a band around the sides and piping at the top and bottom seams. The piping draws the outline of the unit in a single line. Contrast piping makes it a drawing. Matching piping lets it disappear.

Cut it flush. A cushion 15 3/8 in (39 cm) deep sits exactly on the top and lines up with the front face of the cubes. When several units stand in a row, one long cushion made to the full run reads calmer than a line of short ones. The [Kallax glossary entry](https://cushionguide.com/glossary/#ikea-kallax) sorts out the unit names.

## Fabric for a shelf that people sit on

- [Linen-look weaves](https://cushionguide.com/fabrics/linen-look-fabrics/) suit Kallax kitchen banquettes. Plain, calm, many colors.
- [Velvet](https://cushionguide.com/fabrics/velvet/) carries deep greens like the forest green in the photograph. The velvet chart holds more greens than the stripes do.
- [Striped cotton](https://cushionguide.com/fabrics/striped-cotton-and-ticking/) suits a child's room. Judge the stripe from a photo of a finished cushion, not a chart swatch.
- [Performance weaves](https://cushionguide.com/fabrics/performance-and-pet-friendly/) for crayons, juice and dogs: a tight, washable weave in a mid-tone.

The usual wish is to match the fabric bins in the cubes. Order physical samples and hold them against the bins in daylight. A screen can make a fabric look noticeably lighter, or a different tone, than it is.

## Four inches, and the height they add

Height is a feeling. The long Kallax on its side stands about 16 3/8 in tall. A 4 in cushion, the standard, puts the seat near 20 3/8 in before anyone sits down. That suits a window perch, and a child who likes to swing their legs.

At a table, check the knees first. 3 in brings the seat to about 19 3/8 in and gives a lower, neater line. 2 in (5 cm) is the thinnest standard foam, at about 18 3/8 in.

The foam is high-density, which keeps a flat, structured top. That is what a shelf-bench wants. Try your own numbers in the [seat height calculator](https://cushionguide.com/studio/seat-height-calculator/).

## Three cushions for one kids' room

A buyer in the US turned Kallax shelving into bench seating in a kids' room: two long units and one shorter four-cube unit. Before anything was cut, the workshop confirmed the Kallax top and settled the depth at 15 3/8 in (39 cm) for all three cushions.

The two long cushions were made 57 5/8 in (146.5 cm) and the short one about 30 in (76.5 cm). The blue the buyer described was matched to a named shade, parliament, and all three went through the Kallax option on the window-seat listing. They sat flush, front to back.

## Where Kallax orders go wrong

- ✗ Reading 16 3/8 x 57 5/8 in off the box as the seat. On its side, the top is about 15 3/8 x 57 5/8 in.
- ✗ Measuring the catalog instead of the unit. IKEA sizes vary by country; the tape measure does not.
- ✗ Swapping length and width. Label every number: '15 3/8 in deep x 57 5/8 in across'.
- ✗ Rounding 15 3/8 up to 16. Give the fraction; the foam is cut to it.
- ✗ Leaving the stripe direction unsaid. The roll is about 55 in (140 cm) wide, so stripes running front to back on a 57 5/8 in cushion need a seam.
- ✗ Choosing a sage or olive from a screen. Ask for a photo of a finished cushion, or a sample.

> The Kallax box reads 16 3/8 x 57 5/8 in, but that is the unit standing up. On its side, the bench top is about 15 3/8 x 57 5/8 in.
>
> — Hana

## Styling the cubes, and tools before you order

The cushion is one band of color above a grid of squares. Let the grid stay quiet. Take the cushion color from what lives in the cubes: book spines, the bins, a stack of board games.

One parent wanted an olive or sage stripe against peachy-pink walls, but not a strong green. A photo of the finished stripe settled it before cutting. More ideas for small rooms are in [kids' room cushions](https://cushionguide.com/cushions/kids-room-cushions/).

Set size, piping and thickness in the [bench cushion builder](https://cushionguide.com/studio/bench-cushion-builder/). Then read [Kallax top sizes for every unit](https://cushionguide.com/guides/ikea-kallax-bench-cushion-sizes/), [length, depth and thickness explained](https://cushionguide.com/guides/cushion-measurements-length-depth-thickness/) and [ties or a non-slip base](https://cushionguide.com/guides/stop-bench-cushion-sliding-ties-nonslip/). Seven real builds are drawn in [Kallax bench cushion builds](https://cushionguide.com/concepts/kallax-bench-cushion-builds/).

The box gives one number.

The top gives another.

Sit on the second.

> **Tailor's margin:** A Kallax top is smooth. A non-slip base grips it by friction, with no adhesive and nothing left behind on the shelf.

## Thin pad or a 4 in cushion on a Kallax

| Thickness | Feel on the hard top | Best for |
|---|---|---|
| About 1 1/2 in (store pads) | Firm; bottoms out on long sits | Occasional perching, a tidy look |
| 2 to 2 1/2 in | Comfortable for short sits | Kids' rooms, entryways |
| 3 in | Comfortable for everyday sitting | Banquettes at a table |
| 4 in (standard here) | Plump, sofa-like | Window seats and reading spots |

## Buyer questions

**A common question:** What size cushion fits a Kallax turned on its side as a bench?

**The workshop's answer:** The 16 3/8 x 57 5/8 in on the box is width x height, not the seat. On its side, the long 1x4 has a top of about 15 3/8 x 57 5/8 in (39 x 146.5 cm), and the 16 3/8 in becomes the bench height; a 2x2 top is about 15¼ x 30 in (39 x 76.5 cm), roughly 30 in long. The Kallax option reads '15x57 in' because of character limits, but the cushion is made to the full 15¼ x 57¾ in (39 x 146.5 cm). IKEA sizes vary by country, so measure yours and write the size if it differs.

**A common question:** I have a long four-cube Kallax and a single cube side by side under a window. Can one cushion cover both?

**The workshop's answer:** Yes. Measure the whole run and one cushion is made to it; that exact setup came to 15¼ in (39 cm) deep by 74½ in (189 cm) long (15 3/8 x 74 3/8 in). For a single Kallax used as a kitchen banquette, the cushion is made to the 15 3/8 x 57 5/8 in top, in any fabric and color. Custom lengths are quoted from the size and fabric you send.

**A common question:** The listing asks for width and length. Which is which on a Kallax?

**The workshop's answer:** Length is the long side, measured left to right across the front. Width is the short side, front to back, which is the same as seat depth; on a Kallax, 'width' means that depth. Thickness is how tall the cushion is. If in doubt, label your numbers, for example '15 3/8 in deep x 57 5/8 in across', and the cushion will be made correctly.

**A common question:** How do I match the cushion to the fabric bins in my Kallax?

**The workshop's answer:** Order physical samples of the colors on your shortlist and hold them against the bins in your own light. Close-up photos in the chat are a quicker first pass, and the workshop can photograph its nearest fabric to a Pantone reference. Screens mislead: one buyer found a shade too light and another a different tone than it looked online. When the first samples missed, a second round went out free, and warmer browns and olive stripes matched.

**A common question:** Are your neutral stripes gray, beige or olive? I want a sage look, not a strong green.

**The workshop's answer:** Stripe names can mislead: one of the neutral stripes buyers expect to be gray is actually cream and beige. The most reliable guide to an olive or beige undertone is a photo of a finished cushion, which the workshop will send. If none of the stripes gives the sage you want, the velvet chart has more greens.

**A common question:** Can I pay extra to rush a Kallax cushion for a birthday?

**The workshop's answer:** Often, yes. Paid priority production moves the order to the front of the queue, which matters when 200 or more orders are active. Send your size and fabric first, then add the separate express fee listing; the fee is quoted per order and the delivery window is confirmed when you pay. Even priority production can't meet a deadline only a few days away.

## Kallax questions, asked next

### Does a cushion stay put on the smooth Kallax top?

A non-slip base helps most. It replaces the whole bottom panel with a grippy fabric that holds by friction, with no adhesive and no residue. It is an extra-cost option chosen in personalization. Ties need a frame to wrap around, which a Kallax top does not offer.

### How high will I sit on a Kallax bench?

The long unit on its side stands about 16 3/8 in tall. Add a 4 in cushion and the seat is about 20 3/8 in before it compresses. 3 in brings it to about 19 3/8 in, and 2 in, the thinnest standard foam, to about 18 3/8 in.

### Which way should stripes run on a long Kallax cushion?

Say so for each cushion. The fabric roll is about 55 in (140 cm) wide, so stripes running front to back on a 57 5/8 in cushion need a seam. Stripes are matched on one face only, so put that face up.

### Can the Kallax cushion cover be washed?

Yes. Every foam cushion has a zippered, fully removable cover at no extra cost, with the zipper hidden on the back edge or the underside. Wash it on a gentle cycle at 86°F (30°C) and let it air dry before zipping it back on.

### What happens if the cushion comes out the wrong size?

Send the workshop a photo with a tape measure along the full side. When it made the error in past cases, it remade the piece and did not ask for the wrong one back. Buyers who preferred to keep a piece were offered a partial refund instead.

### Is it safe to sit on a Kallax turned on its side?

A cushion adds comfort, not strength. Plenty of owners use the unit as a bench, but the workshop makes the cushion, not the shelf, so it can't rate the furniture for sitting. Follow the furniture maker's own assembly and wall-anchoring instructions, spread the load along the top, and keep children from standing or jumping on it.

### Why are most ready-made Kallax cushions so thin?

Most store pads for these units are sold by cube count and run about 1 1/2 to 2 1/2 in thick. A thin pad keeps the seat low and looks tidy, but it bottoms out on the hard top during longer sits. A 3 or 4 in cushion cut to your unit's real top is noticeably more comfortable and raises the seat accordingly.

## Related at the atelier

- [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.
- [What size cushion fits on top of an IKEA Kallax used as a bench?](https://cushionguide.com/answers/cube-shelf-bench-cushion-size/): 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.
- [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.
- [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.
- [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).

*— 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/cushions/ikea-kallax-cushions/