---
title: "Floor Sofa Bed Size: 39 x 79 in Mattresses, Twin XL Sheets"
url: "https://cushionguide.com/answers/floor-sofa-bed-size-sheets/"
section: "The Cutting Table"
author: "Nate Kowalski, The Pattern Engineer of Detroit"
author_url: "https://cushionguide.com/masters/nate/"
published: "2026-08-10"
updated: "2026-08-10"
keywords: "floor sofa bed size, floor sofa sheets twin xl, floor couch mattress size, l shaped floor sofa bed dimensions, floor sofa flat bed size"
---

# What bed size does the floor sofa make, and what sheets fit it?

*Six numbers, one sheet size. Here they are, labeled.*

Also asked as: What size sheets do you recommend?; What are the dimensions as a flat bed?

> **The quick answer:** Each floor sofa mattress is 39 x 79 in (about 100 x 200 cm), close to Twin XL, so Twin XL sheets fit each one. Laid flat, the L-shape without the ottoman makes about 79 x 79 in, and with the ottoman 79 x 119 in. The ottoman alone is roughly twin size. The bean bag sofa bed opens to 55 x 79 in (140 x 200 cm).

![Charcoal linen-look tufted floor lounger with a back cushion and bolster on a cream rug below framed line-art prints](https://cushionguide.com/media/modular-floor-sofas/charcoal-tufted-floor-lounger-line-art-prints-1600.webp "The same module in charcoal becomes a graphic anchor against warm plaster.")

## Key facts

- Each floor couch mattress is 39 x 79 in (about 100 x 200 cm).
- The standard single sofa is 39 x 79 x 13 in (about 100 x 200 x 33 cm).
- Twin XL sheets fit each mattress.
- The L-shape laid flat without the ottoman is about 79 x 79 in (200 x 200 cm).
- The L-shape laid flat with the ottoman is 79 x 119 in (200 x 302 cm).
- The ottoman alone is about twin size.
- The bean bag sofa bed opens to 55 x 79 in (140 x 200 cm).

## How many Twin XL sheets does a floor sofa need?

- ✓ Count mattresses, not sofas: each one is 39 x 79 in (about 100 x 200 cm).
- ✓ Buy one Twin XL fitted sheet per mattress.
- ✓ L-shape without the ottoman: two sheets for a flat area of about 79 x 79 in (200 x 200 cm).
- ✓ L-shape with the ottoman: the flat area grows to 79 x 119 in (200 x 302 cm), and the ottoman is roughly twin size.
- ✓ Closed-corner sofa: it lays out to 79 x 118 in (200 x 300 cm).
- ✓ Bean bag sofa bed: a different piece, 55 x 79 in (140 x 200 cm) opened.

## Piece by piece, laid flat

| Piece | Flat size | Sheets |
|---|---|---|
| One floor couch mattress | 39 x 79 in (100 x 200 cm) | 1 Twin XL |
| L-shape, no ottoman | About 79 x 79 in (200 x 200 cm) | 2 Twin XL, one per mattress |
| L-shape with ottoman | 79 x 119 in (200 x 302 cm) | 2 Twin XL, plus one for the twin-size ottoman |
| Bean bag sofa bed | 55 x 79 in (140 x 200 cm) | Sized to 55 x 79 in |

## Queen or king? Neither, exactly

The flat bed is not one mattress. It's two separate 39 in (100 cm) mattresses lying side by side, so the honest spec is two Twin XL sheets, one per piece, not one big sheet stretched across a seam. Each piece is its own [floor mattress](https://cushionguide.com/glossary/#floor-mattress); the standard sofa stands 39 x 79 x 13 in (about 100 x 200 x 33 cm) with the cushion.

The [Twin XL](https://cushionguide.com/glossary/#twin-xl) match is close, not exact: a Twin XL sheet is cut for 38 x 80 in, so one inch narrower and one inch longer than the mattress. The [floor sofa bed size and firmness Pattern](https://cushionguide.com/guides/floor-sofa-bed-size-firmness/) covers the feel, and [small apartment floor sofa layouts](https://cushionguide.com/concepts/small-apartment-floor-sofa-layouts/) shows where the ottoman goes. Where will your guest sleep, partner: on the L or across the ottoman?

> **Tailor's margin:** Twin XL sheets fit each 39 x 79 in floor sofa mattress; two side by side make a flat bed about 79 x 79 in.

> A floor sofa mattress is 39 x 79 in, close to Twin XL, so buy one Twin XL fitted sheet per mattress, not one big sheet for the whole bed.
>
> — Nate

## Buyer questions

**A common question:** How big is the L-shaped floor sofa laid flat as a bed?

**The workshop's answer:** Without the ottoman it lays out to 79 x 79 in (200 x 200 cm); with the ottoman, 79 x 119 in (200 x 302 cm). A single sofa is 39 x 79 in and the closed-corner sofa is 79 x 118 in.

**A common question:** How big is each mattress, and what bed does it make unfolded?

**The workshop's answer:** Each mattress is 39 x 79 in, nearly Twin XL, and the standard sofa is 39 x 79 x 13 in with the cushion. Side by side they make a bed of about 79 x 79 in, so two Twin XL sheets cover them. The ottoman alone is about twin size.

**A common question:** What size bed sheets does the bean bag sofa bed need?

**The workshop's answer:** Opened out as a bed, it measures 55 x 79 in (140 x 200 cm).

**A common question:** Can the floor sofa seat be made less deep than 39 in?

**The workshop's answer:** Possibly: 30 in (76 cm) deep has been made, but backrests take space. At 28 in (71 cm) only about 16 in (41 cm) of seat remains, and the workshop advises against 29 in. Non-standard widths may not fit the L-shaped backrest.

## Questions buyers ask next

### How deep should a regular floor cushion be for sitting cross-legged?

Standard floor cushions are 24 or 27 in (61 or 69 cm) deep; adults sitting cross-legged do better with at least 28 in (71 cm). Custom depths such as 4 ft x 27 in x 8 in can be ordered.

### Can a round floor cushion be made to an exact diameter?

Yes, up to 49 in (125 cm) across. Order the nearest listed size, for example 32 in for a 33 in round, and note your exact diameter; 59 in (150 cm) is too large.

### What if my room calls for an odd shape, like a trapezoid?

Send a photo or hand sketch with every measurement and the workshop quotes options. When a bench differs only slightly end to end, such as 16.3 vs 16.9 in (41.5 vs 43 cm), an averaged rectangle is recommended instead.

## Related at the atelier

- [Can the L-shaped floor sofa be made to fit my wall dimensions?](https://cushionguide.com/answers/custom-l-shaped-floor-sofa-size/): Yes, within limits: a custom L-shaped floor sofa is built from two sofas resized to your wall runs, each section 39 in (100 cm) deep.
- [What size bed does the floor sofa make? Queen or king?](https://cushionguide.com/answers/floor-sofa-bed-size-king/): The floor sofa makes a bed of about 79 x 79 in (200 x 200 cm), roughly king size.
- [Can the floor sofa be made smaller or narrower to fit my space?](https://cushionguide.com/answers/floor-sofa-custom-smaller-size/): Yes, a floor sofa can be made smaller: order the standard listing and write your width in the order note, such as 60, 65 or 70 in.
- [Can you sleep on a floor sofa? Bed size, firmness and sheets](https://cushionguide.com/guides/floor-sofa-bed-size-firmness/): A modular floor sofa opens into a guest bed of about 79 x 79 in (200 x 200 cm), close to king size, when its two seat mattresses lie side by side.
- [Boneless sofas and couches explained: foam, metal bars and the box they arrive in](https://cushionguide.com/guides/boneless-floor-sofas/): A boneless sofa is a frameless couch built entirely from foam pieces.
- [How to raise floor sofa seat height, layer by layer](https://cushionguide.com/guides/floor-sofa-seat-height-raise/): A floor sofa seat sits about 13.5 to 14.5 in (34 to 37 cm) off the floor, and the simplest way to raise it is to add a layer.

*± 1/4 in — Nate*

---

Written by Nate Kowalski (https://cushionguide.com/masters/nate/) 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/floor-sofa-bed-size-sheets/