How to Choose a Sofa Size: Width, Depth and Seat Height

Short answer: Choose a sofa size using three numbers, in this order: the width of the wall or area it will sit in, the floor depth you can give it once you leave a walkway (at least 36 inches is a common minimum), and the seat height that suits how you sit. Our regular-size two-seaters with arms run from 64.6 inches wide for the Neptune to 77.2 inches for the Atmosphere with rounded arms, with overall depths between 34.8 and 41.0 inches and seat heights between 16.7 and 21.3 inches.

A sofa that looks right in a photo can feel wrong at home when it is too wide for the wall, too deep for the walkway or too high or low for the people using it. Measuring three things before you shop avoids most of that.

On This Page

1. How do I choose a sofa size?
2. How do I measure for walkway space?
3. How wide should a sofa be for my wall?
4. How deep should a sofa be?
5. What seat height should I choose?
6. What size sofa fits a small room?
7. Our recommendation
8. Explore our sofas

How do I choose a sofa size?

Work from the room outward, not from the sofa inward. Each step narrows the choices before you compare styles.

• Width: measure the wall, or the stretch of floor, where the sofa will sit. This sets the longest sofa you can fit.
• Depth: measure from that wall to the nearest obstacle in front (a TV unit, a door swing, the opposite wall), then subtract the walkway you want to keep. The result is the depth available for the sofa and anything in front of it.
• Seat height: compare it with a chair you already find comfortable. It decides whether the sofa feels grounded and relaxed or upright and easy to stand up from.

Our guides cover the next questions in detail: how many modules do you need turns a width into a module list, and our sofa seat depth and height guide explains how the seat feels. This guide helps you decide which size to look at in the first place.

How do I measure for walkway space?

Walkway space is the clear floor you keep for walking, opening doors and moving a coffee table. It is the measurement most often skipped.

1. Measure the clear floor. Record the distance from the sofa wall to the nearest obstacle in front, and the width of the wall.

2. Choose a walkway. Our sectional size guide recommends at least 36 inches as a minimum walkway, with 42 to 48 inches more comfortable on busy paths. This is general advice, not a product specification, so measure the route you actually use.

3. Subtract. Clear floor minus walkway is the depth you have for the sofa, the gap in front of it and a coffee table.

4. Mark it out. Use masking tape to outline the sofa on the floor, walk around it, and open any doors that swing into the area.

For example, say a room has 120 inches of clear floor. Leaving 36 inches for the walkway gives 84 inches. A Ciello Regular seat module is 37.4 inches deep, which leaves 46.6 inches. A gap of 18 inches plus an Ombra coffee table at 21.7 inches deep takes 39.7 inches, so it fits, with about 6.9 inches to spare. Our coffee table guide explains the table gap, and our guide to choosing a sofa configuration for your living room goes deeper on clearances.

Include anything that extends the footprint: a chaise, an ottoman or an open sleeper. A Ciello Regular two-seater with a chaise is about 74.75 x 68.5 inches, and an Orian opens to about 79.75 inches deep as a queen bed.

How wide should a sofa be for my wall?

The sofa has to be narrower than the wall, but how much narrower depends on what else shares it. A side table, a floor lamp or a window edge all take space at the ends, so a sofa that fills the wall from corner to corner leaves nowhere to put a drink.

Our side tables are mostly 19.7 to 21.7 inches wide, so a side table at one end takes about 20 inches from the wall. Our side table guide compares them. Width also changes with arms: an armless layout is narrower, but you give up a place to lean.

Here is how our two-seaters with arms compare on all three numbers. Overall depth is how much floor the sofa takes, back included, and seat height is measured from the floor to the top of the seat cushion.

How wide should a sofa be for my wall?

Gaia XL, Ciello XL and the Atmosphere with square high arms are wider again: 72.4, 80.25 and 81.1 inches. The Atmosphere seat height is for the regular seat, and the storage and sleeper seats differ. Read the complete assembled size in the configurator before you order.

How deep should a sofa be?

Depth has two meanings, and mixing them up is a common mistake. Overall depth is how much floor the sofa takes. Seat depth is how far back you sit, measured from the front of the seat cushion to the front of the back cushion.

They do not move together. Our Cassini is 36.0 inches deep overall with a 26.4 inch seat depth. Our Ciello Regular is 37.4 inches deep overall but has a 21.7 inch seat depth. Ciello XL is 40.2 inches overall with a 26.4 inch seat.

So match each number to its job. Use overall depth to check the room, and seat depth to check comfort. A deeper seat suits curling up, while a shallower one makes upright sitting easier. Our sofa seat depth and height guide compares every collection side by side.

What seat height should I choose?

Seat height decides how the sofa sits against your body. A lower seat feels grounded and relaxed, while a higher seat is generally easier to stand up from. These are general comfort observations rather than rules, and they depend on leg length and how you like to sit.

Our collections fall into two groups. Neptune, Orian, Cassini and the regular Atmosphere seat sit between 16.7 and 17.5 inches high. Ciello and Gaia sit at 21.3 inches.

The simplest test is to measure a dining chair or sofa where you sit comfortably, then compare. If you sit with your feet flat and stand up easily on it, look for a seat height close to that number. Seat height also matters for tables: our coffee table guide suggests a table at seat height or slightly below, and our lowest tables are under 14 inches.

What size sofa fits a small room?

A small room is usually a small width, a small depth, or both. Check which one limits you, then look at the options below. Each width is for the two-seater named, and our guides to sofas under 80 inches and sofas for small apartments and condos compare more layouts.

What size sofa fits a small room?

Width is only half the story. A narrow sofa that is deep can still block a doorway, and Gaia, at about 34.8 inches overall depth, is our shallowest sofa in this comparison. An L-shape can use a corner that would otherwise sit empty. Because our sofas are modular, you can start small and add modules later.

Our recommendation

Start with the tape on the floor, then pick by the limit that matters most in your room.

• Narrow wall: an armless Cassini (53 inches) or Atmosphere (59 inches), or a Neptune with arms (64.6 inches).
• Shallow room or tight walkway: compare overall depth first. Gaia Regular is about 34.8 inches deep and Cassini is 36.0 inches.
• Room to stretch out: Ciello XL or Gaia XL, with seat depths of 26.4 and 25.6 inches, the Atmosphere with a round back at 29.3 inches, or a Ciello chaise if the floor allows the extra depth.
• Upright sitting and a lower seat: Neptune, Orian, Cassini or Atmosphere, all between 16.7 and 17.5 inches high.
• A room that doubles as a guest room: Orian or Neptune, planned with the open bed depth in mind.

If your measurements sit between two sizes, our team can review them in a free design consultation.

Explore our sofas

• Sofas
• Sectional sofas
• Sofa beds

Product specifications can change. Check the current dimensions on the product page before ordering.