How to Choose the Right Sofa Size for Your Living Room
To choose a sofa size, measure the wall it will sit on and aim for a sofa about two-thirds of that length, leaving walkways of 30 inches or more. Check depth against the room, measure every door, hallway and stair turn on the delivery path, and choose seat depth and height to suit the people who'll sit on it.
Inspiration images from the HomePlanner Discover gallery. In the app you start from a photo of your own room.
What size sofa do I need?
Sofa sizes vary by brand, but most fall into a few ranges. Loveseats are roughly 52 to 72 inches long and seat two. Standard three-seat sofas usually run about 78 to 90 inches. Large sofas go past 90 inches, and sectionals are measured along each side. Depth is typically 32 to 40 inches, with deep-seat models going further.
A useful starting point is a sofa about two-thirds the length of the wall it sits against. That leaves room for a side table or lamp at one or both ends and keeps the sofa from looking squeezed in. In a room where the sofa floats, compare it to the rug and the seating area instead of the wall.
How to measure your living room for a sofa
Measure the full wall length, then subtract anything that must stay clear: doors, radiators, vents, outlets you need to reach, and the swing of nearby doors. Note the height of any window sill if the sofa will sit under a window.
Next, measure the depth available. From the wall, add the sofa depth, about 14 to 18 inches to the coffee table, the table itself, and then the walkway beyond it. Main walkways should stay around 30 to 36 inches wide. Mark the sofa outline on the floor with painter's tape and live with it for a day or two; it's the most reliable test there is.
Measure the delivery path, not just the room
Plenty of sofas fit the room but not the front door. Measure the width and height of every doorway the sofa will pass through, plus hallway widths, stair widths, landing turns, ceiling height above stairs and the elevator door and interior if you have one.
Look for the sofa's diagonal depth on the product page; many retailers list it. If not, lay a straight edge from the top of the back to the front of the arm and measure from the bottom back corner of the frame to that edge. If the diagonal depth is less than the door width, the sofa can usually be tilted through. Removable legs and cushions, or a sofa that ships in modules, can save a difficult delivery.
Seat depth, height and arms: the comfort numbers
Size isn't only about fit; it's about how the sofa feels. Seat depth, measured from the front edge to the back cushion, is the number that matters most for comfort.
- Seat depth of about 20 to 22 inches suits upright sitting and shorter people
- Seat depth of 23 to 25 inches is a comfortable middle ground for most households
- Seat depth beyond 25 inches is great for lounging and tall people, but you'll want cushions behind your back
- Seat height around 17 to 19 inches is easy to get in and out of
- Wide, padded arms take up several inches of length each; slim arms give more seating in the same footprint
Sofa, loveseat or sectional?
A sofa plus one or two chairs is the most flexible setup and easiest to rearrange or move to a new home. A loveseat works as the main seat in very small rooms or as a partner to a full sofa. A sectional seats the most people per square foot and fills a corner well, but it fixes the layout and can be harder to fit through doors.
If you entertain often, count seats honestly: two people sit comfortably on most loveseats, three on a standard sofa only if the cushions allow it, and more on a sectional's corner.
Why two sofas of the same size can feel different
Visual weight changes how big a sofa looks. Raised legs, a low back, thin arms and a light fabric make a sofa look smaller than one of the same length with a skirted base, high back and chunky rolled arms. In a small room, choose the lighter look; in a large room with high ceilings, a heavier sofa keeps the space from feeling empty.
In open-plan rooms, check the view from the kitchen or entry as well. A high-backed sofa facing away from the door can block sightlines, while a lower back keeps the space feeling connected.
Quick sofa size checklist before you buy
Run through this list with a tape measure in hand before you order.
- Sofa length around two-thirds of the wall, with clearance at the ends
- At least 30 inches of walkway around the seating area
- 14 to 18 inches between sofa and coffee table
- Diagonal depth smaller than your narrowest door
- Seat depth and height tested in person, or checked against a sofa you already like
- Floor outline taped and lived with for a day