Measured. Fit.
Sofas & sectionals
Sleeper Sofa Dimensions: Closed and Open Depth
A sleeper sofa is two footprints in one listing, and retailers usually only show you the closed one. How to check the open depth, what mattress sizes actually mean inside a sofa, and the clearance the fold-out mechanism demands.
Two footprints, one listing
Closed, a queen sleeper is an ordinary 84-inch sofa. Open, it projects about 90 inches from the wall: the mattress length plus the deck frame and the sofa back behind it. That open depth is the number that decides whether the guest room works, and it's the one most listings bury or omit.
The rule of thumb when the retailer doesn't state it: open depth is roughly the mattress length plus 15 inches. Then add walking space to actually get into the bed, 24 inches along at least one side.
What the sizes really are
Sleeper mattresses are usually the same width as the bedroom equivalent but a few inches shorter, and always thinner (4 to 5 inches):
| Sleeper size | Mattress | Sofa width it needs | Open depth from the wall |
|---|---|---|---|
| Twin | 38 × 72″ | 55-60″ | about 87″ |
| Full | 53 × 72″ | 70″ and up | about 87″ |
| Queen | 60 × 74″ | 80″ and up | about 89″ |
| King | rare | sectionals 100″ and up | about 95″ |
On Alcovio the sleeper size is a filter of its own. Jump straight to queen sleepers or browse all sleeper sofas and narrow by the closed width your wall allows.
The clearance nobody measures
The fold-out mechanism needs room to swing: the deck arcs up and over the front rail before it settles. Keep the coffee table at least 30 inches from the sofa's front edge if you plan to open the bed without moving furniture every time, or pick a table light enough to slide.
Also check bed height: sleeper decks sit 12-14 inches off the floor, lower than a regular bed. Fine for most guests; worth knowing for anyone with mobility constraints (our accessibility clearance guide covers the numbers).
Weight and the stairs question
The mechanism adds 60-100 pounds over the same sofa without it. That matters twice: delivery (a queen sleeper rarely comes apart the way a modular sectional does) and moving day. If the sofa has to climb a switchback stair, compare the boxed dimensions against our will-it-fit-through-the-door guide before ordering.
Every sleeper on Alcovio lists the closed width, depth, and height it was sold with, so start from the size that fits closed, then verify the open depth against your room.
Before you order, run the winner through the will-it-fit calculator: it checks length, width, and height against your doorway, the turn into the room, and your ceiling.