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- Quick answer
- Quick compare: the products in this guide
- Three options at a glance
- 1. Convertible Sofa Bed King,5-in-1 Boneless Couch Corduroy Futon Sofa Bed,Tri-Fold Mattress with Removable Armrests & Handle,Sleeper with Pull Out Bed for Small Space Living Room Bedroom,Black — Smallest listed footprint
- 2. King Oasis Folding Sofa Bed, Corduroy Chair Bed with Pillows — Middle listed footprint
- 3. GEMBED Tri Folding Mattress King Size – 6 Inch Foldable Floor Sofa Bed — Largest listed footprint
- What to check before buying king sofa
- Worked example: fit math for these three options
- Mistakes to avoid
- Related guides
- Frequently asked questions
- Products worth checking
- Sources checked
Quick answer
Three king sofa options are compared here by their listed size, and the sections below use each product’s own listing data. Convertible Sofa Bed King lists 27.6″ D × 76″ W × 15″ H; King Oasis Folding Sofa Bed lists 78.74″ D × 33.5″ W × 15.7″ H; GEMBED Tri Folding Mattress King Size lists 80″ L × 76″ W. By listed floor footprint, Convertible Sofa Bed King is the smallest (14.57 sq ft) and GEMBED Tri Folding Mattress King Size the largest (42.22 sq ft). Specifications come from Amazon listing data checked October 3, 2026; we have not tested these products. Recheck the selected variant and the current price on Amazon before ordering, because titles and specification fields can change.
Quick compare: the products in this guide
Sizes come from the Amazon listings as we read them; check the product page for the current details before you buy.
| Product | Listed details | Link |
|---|---|---|
| Convertible Sofa Bed King,5-in-1 Boneless Couch Corduroy Futon Sofa… | 27.6″D x 76″W x 15″H | See details on Amazon Affiliate link |
| King Oasis Folding Sofa Bed, Corduroy Chair Bed with Pillows | 78.74″D x 33.5″W x 15.7″H; material type Corded Fabric | See details on Amazon Affiliate link |
| GEMBED Tri Folding Mattress King Size – 6 Inch Foldable Floor Sofa Bed | King-6 Inch; material type Memory Foam | See details on Amazon Affiliate link |
Three options at a glance
| Pick | Listed dimensions | Floor footprint | Footprint rank |
|---|---|---|---|
| Convertible Sofa Bed King | 27.6″ D × 76″ W × 15″ H | 2097.6 sq in (14.57 sq ft) | Smallest |
| King Oasis Folding Sofa Bed | 78.74″ D × 33.5″ W × 15.7″ H | 2637.79 sq in (18.32 sq ft) | Middle |
| GEMBED Tri Folding Mattress King Size | 80″ L × 76″ W | 6080 sq in (42.22 sq ft) | Largest |
1. Convertible Sofa Bed King,5-in-1 Boneless Couch Corduroy Futon Sofa Bed,Tri-Fold Mattress with Removable Armrests & Handle,Sleeper with Pull Out Bed for Small Space Living Room Bedroom,Black — Smallest listed footprint
Listed details: dimensions 27.6″ D × 76″ W × 15″ H; color Black(k).
The NLDD is a 5-in-1 convertible floor sofa in black corduroy. The title uses ‘King’ for the sleeping size, and the bullets say removable L-shaped armrests let it change between a boneless couch, a sleeper and a king-size mattress. The spec table lists 27.6″ D × 76″ W × 15″ H and a 27.6-inch seat depth, but gives no item weight, and it does not say which configuration those numbers describe. The bullets add 30D high-resilience memory foam, a machine-washable cover and zippered armrests. It ships vacuum-sealed, with no assembly. The 14.57 sq ft figure (27.6 × 76 ÷ 144) is for the listed dimensions only.
Pros
- Removable L-shaped armrests let it change between couch and bed shapes, per the bullets
- Machine-washable cover and zippered armrests, a care detail the other two do not state
- Ships vacuum-sealed and needs no tools or assembly
Cons
- The listing gives no item weight, so you cannot judge how easy it is to move
- The spec table does not say which configuration 27.6″ × 76″ × 15″ describes, so check the opened size before you buy
- Seat depth of 27.6″ is a floor-level seat, and the bullets give no weight limit
Who it is for / who should skip it: Pick it for a low floor couch that opens into a larger sleeping surface in a small space. Skip it if you need a firm height, a weight limit or the opened bed size confirmed.
2. King Oasis Folding Sofa Bed, Corduroy Chair Bed with Pillows — Middle listed footprint
Listed details: dimensions 78.74″ D × 33.5″ W × 15.7″ H; item weight 28.7 pounds; material Corded Fabric; color Beige.
The King Oasis is a folding corduroy chair bed in beige, and ‘King’ here is the brand name, not a size. It is a single sleeper: the bullets say it changes from a floor chair to a lounger or a single sleeper bed. The spec table lists 78.74″ D × 33.5″ W × 15.7″ H and 28.7 pounds, with a 15.7-inch seat height. It includes pillows, and a detachable headrest and lumbar pillow fasten with buttons. The filling is described as shredded foam. It ships compressed and needs 24 to 48 hours to regain its shape. At 18.32 sq ft (78.74 × 33.5 ÷ 144), the footprint is for the unfolded bed.
Pros
- Includes pillows, plus a detachable headrest and lumbar pillow with button fasteners
- Listed weight of 28.7 pounds and a 15.7-inch seat height give you concrete numbers
- Unfolds to a single sleeper of 33.5″ × 78.74″; folded, it is a floor chair
Cons
- Not a king-size sleeper: ‘King’ is the brand name, and the 33.5″ width is a single
- Shredded foam filling is described, so it may settle differently from the memory foam options
- Needs 24 to 48 hours to expand, and no weight limit is stated
Who it is for / who should skip it: Choose it for a single-person floor lounger that becomes a guest bed. Skip it if you need a king-size surface for two.
3. GEMBED Tri Folding Mattress King Size – 6 Inch Foldable Floor Sofa Bed — Largest listed footprint
Listed details: dimensions 80″ L × 76″ W; item weight 21.21 kg; material Memory Foam; color Grey.
The GEMBED is a tri-fold king-size memory foam mattress listed at 80″ L × 76″ W × 6″ thick and 21.21 kg. The title calls it a floor sofa bed, but the bullets describe a mattress made of three foam parts with a removable, machine-washable cover, for guests, camping, RVs, yoga and travel. The spec table lists memory foam and no armrests, back or seat dimensions. The footprint of 42.22 sq ft (80 × 76 ÷ 144) is when it is fully open, and it is the only one of the three that is a true king size. Vacuum packed, it needs 24 to 48 hours in a ventilated area before first use.
Pros
- Only true king-size surface, 80″ × 76″, which the listing says is for guests and camping
- Three foam parts with a removable, machine-washable cover, per the bullets
- Memory foam and a 6-inch thickness are both stated in the spec table
Cons
- A mattress more than a sofa: the listing describes no armrests, back or seat
- Largest footprint at 42.22 sq ft when open, nearly 3 times the NLDD’s 14.57 (42.22 ÷ 14.57 ≈ 2.9)
- Needs 24 to 48 hours in a ventilated area before first use
Who it is for / who should skip it: Choose it for a king-size guest or floor bed that folds away. Skip it if you want a couch back and arms.
What to check before buying king sofa
‘King sofa’ does not describe one product type, and these three listings show why. The NLDD is a convertible floor sofa that can become a king-size mattress, the King Oasis is a single-sleeper chair bed whose brand name is King Oasis, and the GEMBED is a king-size tri-fold mattress. Decide first whether you need a sofa or a bed, because only the NLDD claims to be both.
Second, check the real sleeping size. The GEMBED lists 80″ L × 76″ W. The NLDD lists 76″ W as its longest dimension, with a 27.6″ depth, but does not say which configuration that is. The King Oasis is 33.5″ W × 78.74″, a single. If two adults will sleep on it, the GEMBED is the one with a clear king-size figure.
Third, compare how it sits as a sofa. The NLDD gives a 27.6-inch seat depth, the King Oasis a 15.7-inch seat height and 33.5-inch seat depth, and the GEMBED gives neither. A floor sofa is low, and getting out of it can be hard for some people. None of the listings gives a weight limit.
Fourth, compare the fill. The NLDD says 30D high-resilience memory foam, the GEMBED says memory foam, and the King Oasis says shredded foam. Shredded foam conforms but can shift; memory foam holds a shape. All three ship compressed, and the King Oasis and GEMBED both say to allow 24 to 48 hours to expand.
Fifth, check cleaning. The NLDD and GEMBED list machine-washable covers. The King Oasis text shown does not.
Finally, footprints are not directly comparable because the three are measured in different forms: 14.57 sq ft for the NLDD’s listed size, 18.32 for the King Oasis, and 42.22 for the open GEMBED. Place a tape on the floor at the opened size.
Decision rule: sofa and bed in one means NLDD, a king-size bed means GEMBED, and a one-person lounger means King Oasis.
Worked example: fit math for these three options
This worked example is our own planning arithmetic from the listed dimensions, not test results. The wall length and walkway width are assumed example values; replace them with your measurements.
Wall example. Assume 96 inches of clear wall.
- Convertible Sofa Bed King: 96 − 76 = 20 inches spare; centred, 10 inches on each side before trim, plugs or curtains.
- King Oasis Folding Sofa Bed: 96 − 33.5 = 62.5 inches spare; centred, 31.25 inches on each side before trim, plugs or curtains.
- GEMBED Tri Folding Mattress King Size: 96 − 76 = 20 inches spare; centred, 10 inches on each side before trim, plugs or curtains.
Walkway example. The US Access Board gives 36 inches as the minimum clear width for an accessible route. That figure is a yardstick, not a rule for private homes. To keep 36 inches clear beside each product, the walkway between it and the opposite obstacle must be at least 36 inches plus its depth:
- Convertible Sofa Bed King: 36 + 27.6 = 63.6 inches of total path width.
- King Oasis Folding Sofa Bed: 36 + 78.74 = 114.74 inches of total path width.
- GEMBED Tri Folding Mattress King Size: 36 + 80 = 116 inches of total path width.
Footprint. Depth × width, converted at 144 square inches per square foot:
- Convertible Sofa Bed King: 27.6 × 76 = 2097.6 sq in, or 14.57 sq ft.
- King Oasis Folding Sofa Bed: 78.74 × 33.5 = 2637.79 sq in, or 18.32 sq ft.
- GEMBED Tri Folding Mattress King Size: 80 × 76 = 6080 sq in, or 42.22 sq ft.
Mistakes to avoid
- Reading King Oasis as a king size. King is the brand name. The unit is 33.5″ wide, a single sleeper.
- Expecting a sofa from a mattress. The GEMBED is a tri-fold mattress and the listing describes no armrests or back.
- Using the NLDD dimensions without checking the form. The listing does not say which configuration 27.6″ × 76″ × 15″ describes.
- Sleeping on it straight from the box. The King Oasis and GEMBED both say to wait 24 to 48 hours for the foam to expand.
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Frequently asked questions
How big is a king sofa bed?
The only listing here with a clear king-size figure is the GEMBED at 80″ L × 76″ W. The NLDD lists 76″ W as its longest figure but does not say which form that is, and the King Oasis is a 33.5″ wide single. Check the opened size before you buy.
Is the King Oasis a king-size sofa bed?
No. King Oasis is the brand name. The listing describes a folding chair bed that becomes a single sleeper, with a 33.5″ × 78.74″ footprint. For a king-size surface, the GEMBED mattress lists 80″ × 76″, though it has no couch back or arms.
Do these need assembly?
The NLDD bullets say no assembly, tools or screws. The King Oasis bullets say no assembly, just unbox and unfold, and the GEMBED arrives vacuum packed. The King Oasis and GEMBED both say to allow 24 to 48 hours for the foam to expand.
Can the covers be washed?
The NLDD bullets say it has a machine-washable cover and zippered armrests. The GEMBED lists a removable, machine-washable cover. The King Oasis text shown does not mention cover care, so check the listing for washing instructions before you buy it for a household with kids or pets.
Products worth checking
We have not tested these products. Sizes and features come from the Amazon listings as we read them; where a listing does not say, we say so.
Convertible Sofa Bed King,5-in-1 Boneless Couch Corduroy Futon Sofa Bed,Tri-Fold Mattress with Removable Armrests & Handle,Sleeper with Pull Out Bed for Small Space Living Room Bedroom,Black
- Keep in mind: we have not tested it, and the listing may show more than one size or finish, so pick the variant that matches your numbers.
King Oasis Folding Sofa Bed, Corduroy Chair Bed with Pillows
- Keep in mind: we have not tested it, and the listing may show more than one size or finish, so pick the variant that matches your numbers.
GEMBED Tri Folding Mattress King Size – 6 Inch Foldable Floor Sofa Bed
- Keep in mind: we have not tested it, and the listing may show more than one size or finish, so pick the variant that matches your numbers.
Sources checked
- US Access Board guide to clear width
- Amazon listing for Convertible Sofa Bed King,5-in-1 Boneless Couch Corduroy Futon Sofa Bed,Tri-Fold Mattress with Removable Armrests & Handle,Sleeper with Pull Out Bed for Small Space Living Room Bedroom,Black
- Amazon listing for King Oasis Folding Sofa Bed, Corduroy Chair Bed with Pillows
- Amazon listing for GEMBED Tri Folding Mattress King Size – 6 Inch Foldable Floor Sofa Bed
Specifications come from the Amazon listings as we read them for this guide. Product details and availability can change, so confirm on the product page before you buy.
