--- title: "Floor Sofa Bed Size: About 79 x 79 in, Roughly a King" url: "https://cushionguide.com/answers/floor-sofa-bed-size-king/" section: "The Cutting Table" author: "Hana Lindqvist, The Quiet Geometer of Seattle" author_url: "https://cushionguide.com/masters/hana/" published: "2026-07-30" updated: "2026-07-30" keywords: "floor sofa bed size, floor sofa king size bed, twin xl floor mattress, modular floor sofa bed, teddy floor sofa bed" --- # What size bed does the floor sofa make? Queen or king? *Two mattresses, one floor. The math is simple. A whole room that turns into a bed is a different feeling.* Also asked as: What size bed is this equivalent to?; What are the measurements side by side on the floor? > **The quick answer:** The floor sofa makes a bed of about 79 x 79 in (200 x 200 cm), roughly king size. Each seat mattress is 39 x 79 in (100 x 200 cm), about a US twin XL, and two side by side give that square. The corner version with ottoman lays out larger than a king, and the teddy convertible opens to 63 x 78.7 in (160 x 200 cm). ![Two cream velvet floor sofas set in an L-shape, one with rust ends and one with mustard, around a shaggy rug and oak table](https://cushionguide.com/media/modular-floor-sofas/rust-mustard-floor-sofas-l-shape-corner-lounge-1600.webp "Two floor sofas meet in the corner to make an L-shaped lounge, one edged in rust and one in mustard.") ## Key facts - Each seat mattress is 39 x 79 in (100 x 200 cm), about a US twin XL. - Two mattresses side by side make about 79 x 79 in (200 x 200 cm), 6.3 in (16 cm) thick. - The bed layout is roughly king size; the workshop has also called it double. - An ottoman opens into a further 39 x 79 in bed. - The corner version with ottoman lays out larger than a king, room for 2 adults and 2 children. - The teddy convertible opens to 63 x 78.7 in (160 x 200 cm). - A single sofa seats 2 people, sometimes 3. ## Every layout, measured | Layout | Size | Worth knowing | |---|---|---| | One seat mattress | 39 x 79 in (100 x 200 cm) | About a US twin XL | | Two mattresses side by side | About 79 x 79 in (200 x 200 cm) | Roughly king; 6.3 in (16 cm) thick | | Ottoman, opened | Adds 39 x 79 in (100 x 200 cm) | One more sleeping surface | | Corner version with ottoman | Larger than a king | Room for 2 adults and 2 children | | Teddy convertible, opened | 63 x 78.7 in (160 x 200 cm) | A separate convertible model | | Single sofa, as seating | 39 x 79 x 14 in (100 x 200 x 36 cm) | Seats 2, sometimes 3 | ## Two twin XL mattresses, 39 x 79 in each Each seat mattress is 39 x 79 in. That is close to a US [twin XL](https://cushionguide.com/glossary/#twin-xl). Two of them, side by side, make a square of about 79 x 79 in. One careful measurement came back at 78.5 x 78 in. Fabric and filling move a little. The workshop has called this layout both double and king. By the numbers, it is roughly king. The [bed size and firmness Pattern](https://cushionguide.com/guides/floor-sofa-bed-size-firmness/) goes further. ## On a tatami platform, and in a small room A buyer in the US planned to set the sofa on a king-size tatami platform. The seat cushions side by side come to roughly king-bed size, so it suits. The corner version with the ottoman lays out larger than a king. It needs that floor free. Leave a hand's width of floor around it if you can. The [layouts Pattern](https://cushionguide.com/guides/modular-floor-sofa-layouts/) and [modular floor sofas](https://cushionguide.com/cushions/modular-floor-sofas/) show the shapes. Will it be a sofa most nights, or a bed? A sofa by day. A bed by night. The same 79 inches. > **Tailor's margin:** Two 39 x 79 in floor sofa mattresses side by side make about 79 x 79 in, roughly a king; each one alone is about a twin XL. > The floor sofa corner set with ottoman lays out larger than a king bed, with room for 2 adults and 2 children on the floor. > > — Hana ## Buyer questions **A common question:** Is the floor sofa bed a queen or a king? **The workshop's answer:** The sofa measures 39 x 79 in, and laid flat on the floor it becomes about 79 x 79 in, which is king size. The corner version with the ottoman makes a bed larger than a king, big enough for 2 adults and 2 children. **A common question:** What are the bed dimensions once it's opened out? **The workshop's answer:** Each seat mattress is 39 x 79 in; side by side they make about 79 x 79 in, measured once at 78.5 x 78 in. In centimeters the sofa is 39¼ x 78¾ x 14¼ in (100 x 200 x 36 cm) and the bed option 78¾ x 78¾ x 6¼ in (200 x 200 x 16 cm). **A common question:** Are the teddy floor sofa mattresses a standard US twin? **The workshop's answer:** Each seat mattress is twin XL size, 39 x 79 in. Laid side by side, the two give a sleeping surface of about 79 x 79 in, roughly king size. **A common question:** What size bed does it turn into, so I can buy sheets? **The workshop's answer:** Each mattress is 39 x 79 in. Side by side they make a 79 x 79 in bed, which the workshop has called double size. An add-on ottoman opens into a further 39 x 79 in bed. ## Questions buyers ask next ### How thick is the floor sofa when it's laid out as a bed? The bed layout is about 6.3 in (16 cm) thick, the seat mattresses laid flat. As a sofa, the single model measures 39¼ x 78¾ x 14¼ in (100 x 200 x 36 cm), about 39 x 79 x 14 in. ### How many people does one floor sofa seat? A single floor sofa seats 2 people, sometimes 3, on its 39 x 79 in (100 x 200 cm) seat mattress. For more seats, the corner version with an ottoman adds both seating and sleeping room. ### Is the teddy convertible the same bed size as two mattresses? No. The teddy convertible model opens to 63 x 78.7 in (160 x 200 cm), narrower than the roughly 79 x 79 in bed made from two seat mattresses laid side by side. ## Related at the atelier - [Is a floor sofa comfortable enough for guests to sleep on?](https://cushionguide.com/answers/floor-sofa-guest-bed-comfort/): Yes, a floor sofa is comfortable enough for guests to sleep on: laid flat, its two mattresses make a 79 x 79 in (200 x 200 cm), roughly king-size surface that two adults can share. - [What bed size does the floor sofa make, and what sheets fit it?](https://cushionguide.com/answers/floor-sofa-bed-size-sheets/): 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. - [Do you make a frameless floor sofa with no legs, just foam and fabric?](https://cushionguide.com/answers/frameless-legless-floor-sofa/): Yes, the modular corduroy floor sofa is frameless: no wooden or metal legs, only cushions and fabric. - [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. - [Modular Floor Sofa in Charcoal: Porch Sense for a Living Room](https://cushionguide.com/readings/charcoal-tufted-floor-lounger-line-art-prints/): A charcoal modular floor sofa is the forgiving choice for a living room shared with children or pets, because a near-black linen-look weave hides everyday marks that light gray shows quickly. - [Modular Floor Sofa in Rose Velvet: Craft Seen at Floor Height](https://cushionguide.com/readings/rose-velvet-floor-sofa-low-angle-sunset/): A modular floor sofa in velvet shows its finishing best at floor height in low light: a straight seam where two colors meet, clean box edges with no piping to hide behind, and pile that catches the… - [How to raise floor sofa seat height, layer by layer](https://cushionguide.com/guides/floor-sofa-seat-height-raise/) *— 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/floor-sofa-bed-size-king/