Sofa Sizes and Depth, Explained

The short answer

There is no single official sofa size. Makers publish their own measurements, and retail guides describe common ranges. Furniture maker Castlery puts a standard three-seat sofa at about 79 to 87 inches wide (200 to 220 cm) and a two-seater at about 59 to 71 inches (150 to 180 cm). For depth, it calls 33 to 37 inches standard and 39 inches or more a deep-seat sofa.

On Wiki Shopping, 349 of the 718 sofas listed on October 26, 2026 state a width. The largest group is 70 to 89 inches wide (102 sofas).

The three numbers on a listing

• Width is measured from the outside of one arm to the outside of the other. It decides whether the sofa fits the wall. Castlery notes that each arm takes roughly 4 to 8 inches, so the space you can sit on is narrower than the listed width.
• Depth runs from the front edge to the back of the frame. It decides how far the sofa reaches into the room and how you sit: a deeper seat suits lounging with your legs up, a shallower one suits sitting upright.
• Height is floor to the top of the back. Castlery gives 30 to 35 inches as the usual range, and a lower back makes a sofa look lighter in a small room.

Sofa widths on Wiki Shopping

How many of the sofas on Wiki Shopping state each width, on October 26, 2026. Each width links to its filter page.

Loveseat or sofa?

A loveseat is a short sofa made for two people. Our own lists show the gap in width. Of the 74 loveseats that state a width, 57 are under 70 inches and none is 90 inches or wider. Of the 107 listings sold simply as a sofa that state a width, 55 fall between 70 and 89 inches. Sectionals and modular sofas run larger: most that state a width are 90 inches or more.

Pick a loveseat for a short wall or a second seat; pick a full sofa to seat three or to lie down.

How to measure before you buy

1. Measure the wall and the walkway. Castlery suggests leaving about 30 to 35 inches for paths around the furniture and 16 to 20 inches between the sofa and a coffee table.
2. Measure the way in. Check the width of every door, hall and stair turn the sofa has to pass, and compare it with the sofa's depth and height, since a sofa usually goes through a door on its side or back.
3. Read the seat numbers too. If the listing gives seat depth and seat height, compare them with a chair you find comfortable.

How long does a sofa last?

No standard sets a lifespan. How long one lasts depends on the frame, the cushion filling, the fabric and how hard it is used. The maker's warranty is the clearest written promise you can compare: check how many years it covers the frame and how long it covers cushions and fabric, which are often shorter.

How we count

Each sofa on Wiki Shopping has its width read from the store listing and placed in one of four ranges. Sofas whose listing gives no width are counted as "Not stated". The counts change as listings are added or removed.

Shop by spec

More in Home & Kitchen

Sources

1. castlery.com: sofa sizes and dimensions