How to Measure for a Sofa: Get These Eight Numbers Right Before You Order
The short answer: a sofa is more than its width. On the sofa itself you need six numbers — overall width, overall depth, overall height, seat depth, seat height and arm height. In the room you need the clear walkway in front of the sofa and the delivery route from your front door to the living room. Eight in total. The two most often forgotten are the walkway and the delivery route, and those two are exactly what drives returns.
Why people measure and still get it wrong
Most people do measure before ordering. They measure the wall, confirm the sofa is shorter than the wall, and hit checkout. The problem is that a sofa is a three-dimensional object. It eats into the length of the wall, the depth of the floor, and the line you walk along — all at once. Wall length only covers the first of those.
Among the sizing questions NOSA's customer team receives, "the sofa is longer than the wall" is actually rare. Far more common is that once the sofa is in, the coffee table can only be pushed up to knee height, or there are barely forty-odd centimetres between the TV unit and the sofa and two people have to turn sideways to pass. You can't see that in a photo, and measuring the wall won't reveal it either.
The sofa itself: six numbers
Product pages usually list three numbers — width × depth × height. That's the outer envelope, and it isn't enough. These six are the full set.
- Overall width: the outermost width including the arms. Compare it against the clear width of your wall; leaving roughly 30 cm at each side keeps it from looking crammed.
- Overall depth: from the front edge of the seat cushion to the outermost point of the backrest. This number decides how far the sofa pushes into the middle of the room. Some sofas have a backrest that leans back, so the real footprint can be a few centimetres more than stated.
- Overall height: this affects sightlines and window sills. If the backrest rises above the bottom of the window or blocks where a picture hangs, the room suddenly feels lower.
- Seat depth: from the front edge of the cushion to the backrest. 50 to 55 cm is the comfortable range for sitting upright. Anything over 60 cm is usually designed for lounging; sit up straight and your lower back is left unsupported.
- Seat height: floor to the surface of the cushion. 41 to 43 cm sits low and reads relaxed; 48 to 50 cm makes standing up easy, and the difference is obvious in a household with older family members.
- Arm height and arm width: arm height determines how tall your side table should be (level with the arm, or 2 to 5 cm lower, works best), while arm width quietly steals usable seating length. Take two sofas both 200 cm wide: one with 10 cm arms and one with 25 cm arms are completely different pieces of furniture to sit on.
The room: two more numbers
The seventh number is the clear distance directly in front of the sofa. Allow 35 to 45 cm between the sofa and the edge of the coffee table, so legs fit and you can reach a glass without standing up. If people also need to walk behind the coffee table, plan on 75 to 90 cm for the whole passage. Only once you've measured that line do you know how deep a sofa your living room can actually take.
The eighth is the delivery route. Measure the clear width of your front door, the internal depth and door width of the lift, and the diagonal clearance at stair turns. A sofa can be carried on its side, so what actually has to fit through is the smaller of its depth and its height, not its width. In older apartments and walk-up floors, this step matters more than the other seven combined.
The two things most often missed
The first is reading overall depth as seat depth. You see "depth 115 cm" and assume a deep, enveloping seat, when the actual seat depth may be only 60 cm — the rest is backrest thickness and recline angle. It works the other way too: a sofa with an overall depth of just 82 cm can still have a 50 cm seat depth and sit exactly right. Dutchbone Boho has that ratio — 82 cm overall depth, 50 cm seat depth — which makes it a strong pick for a small living room.
The second is measuring the space but not the people who live in it. Seat height and seat depth should be chosen around height and habits. If you like to sit cross-legged or half-recline, go for a deep seat and a low seat height; if there are older family members at home, or anyone who gets up often, a seat height of 48 cm or more makes life much easier. When the same sofa gets wildly different reviews from two households, this is usually why.
Real dimensions of sofas currently at NOSA
Below are the actual figures for a range of sizes, ready to compare against your own living room. All measurements in centimetres.
| Sofa | Width | Depth | Height | Seat height | Price | Best suited to |
|---|---|---|---|---|---|---|
| Dutchbone Boho two-seater sofa | 143 | 82 | 75 | 46 | NT$45,600 | Small living rooms and studios; fits any wall from 180 cm |
| Zuiver Sofabed Cielke three-seater sofa bed | 184 | 90 | 84 | 41 | NT$40,200 | Compact homes that still need a guest bed |
| Zuiver Noxx two-seater sofa | 185 | 115 | 73 | 43 | NT$59,700 | Deep, with one side you can stretch out on — made for film nights |
| Dutchbone Douglas three-seater sofa | 214 | 102.5 | 78 | 50 | NT$111,100 | A high 50 cm seat, so it's easier for older family members to stand up |
| Zuiver Summer three-seater sofa | 230 | 101 | 82 | — | NT$110,600 | Standard three-seater scale; wants a living room 300 cm wide or more |
| Dutchbone Rocca 4.5 large sofa | 250 | 92 | 83 | 43 | NT$146,700 | Long, but only 92 cm deep — easy to keep a walkway |
| Zuiver Wester three-seater sofa | 252 | 100 | 82 | 46 | NT$106,700 | The main sofa for a long living room |
| Zuiver Milka 4.5 large sofa (left-facing) | 350 | 141 | 70 | 41 | NT$131,000 | At 141 cm deep, it needs a wall over 4 m and a wide walkway |
Dimensions and prices are from the NOSA site at the time of writing; the product page is always authoritative.
Matching sofa size to wall length
Floor area isn't a useful guide — usable wall length is. For walls under 220 cm, look at two-seater proportions; something like the 143 cm-wide Dutchbone Boho still leaves breathing room on both sides. For walls between 260 and 300 cm, aim for an overall width of 180 to 214 cm — Zuiver Noxx (185 cm) and Dutchbone Douglas (214 cm) both sit in that band. Only at 320 cm and above does a 230 to 252 cm three-seater or large sofa make sense, such as Zuiver Wester.
The depth threshold is harder than the length one. Zuiver Milka 4.5 is 141 cm deep, and once it's in you still need at least 90 cm of walkway — meaning that side of the room has to offer 230 cm or more of depth for it to work. If your living room is narrow but you want a long sofa, look instead at a proportion like Dutchbone Rocca 4.5: 250 cm wide, only 92 cm deep.
When the dimensions really are tight
Sofas from the Italian house Samoa Italia are modular: width and configuration can be specified to suit the space, and they can be shipped as separate units. Crisp (from NT$49,500) and Spin (from NT$67,500) both fall into this category. When a stairwell turn is impassable or the living room is an awkward shape, a modular sofa is usually the only remaining option. These made-to-order Italian pieces are sold as pre-orders, with a lead time of roughly 1–3 months.
Frequently asked questions
What should I measure on a sofa? Is width enough?
Measuring only the width is the most common mistake. You need at least six numbers: overall width, overall depth, overall height, seat depth, seat height and arm height. You also need two numbers for the room: the clear distance from the front of the sofa to the coffee table or TV unit, and the width of the delivery route from your front door to the living room. Most returns don't happen because the sofa is too wide — they happen because the walkway disappears or the sofa won't come through the door.
How much walkway do I need in front of the sofa?
Allow 35 to 45 cm from the front of the sofa to the edge of the coffee table, so you can stretch your legs and reach things without getting up. If people also need to walk behind the coffee table, plan on 75 to 90 cm for the whole passage. For a side route that people only pass through, 60 cm is the acceptable minimum.
What's the difference between seat depth and overall depth, and which one affects comfort?
Overall depth is the horizontal distance from the sofa's front edge to the outermost point of the backrest, and it determines how much space the sofa consumes; seat depth is the distance from the front edge of the cushion to the backrest, and it determines how you sit. A seat depth of 50 to 55 cm is the comfort zone for sitting upright; over 60 cm you usually need a cushion behind your back, or the sofa was designed for lounging. Take the Zuiver Noxx in this article: its 115 cm overall depth comes from one side being built as an extended surface you can lie across.
What seat height makes it easy to stand up?
Seat heights typically fall between 41 and 50 cm. A 41 to 43 cm seat feels more relaxed and sits visually lower, but older family members or anyone with bad knees will find it harder to get up; 48 to 50 cm makes standing easy and holds you more upright. In the table above, Dutchbone Douglas has a 50 cm seat height and Zuiver Milka a 41 cm one — the difference in feel is significant.
For a living room of roughly 20 to 30 ping (about 65 to 100 m²), how long a sofa is safe?
In practice, what matters is the usable wall length in the living room, not the total floor area. With a wall of 260 to 300 cm, aim for an overall sofa width of 180 to 210 cm, leaving 30 cm or more of breathing room on each side. Only walls of 320 cm and above suit a 230 to 250 cm three-seater or large sofa. Under 220 cm, move to two-seater proportions — for example the 143 cm-wide Dutchbone Boho.
What if it won't fit through the door? Can I check before ordering?
Measure three places first: the clear width of your front door, the internal depth and door width of the lift, and the diagonal clearance at stair turns. Take the smaller of the sofa's depth and height as the narrowest opening it has to pass through, since a sofa can be carried on its side. Modular sofas from the Italian house Samoa Italia can be shipped as separate units, which makes them the safest choice for older apartments and narrow staircases. Tell NOSA's customer team your floor and lift dimensions before ordering and we can check it for you.
Sources
- Prices and stock: NOSA Zuiver product pages, NOSA Dutchbone product pages, NOSA Samoa Italia product pages
- Sofa dimensions: official brand specification drawings and the specification fields on NOSA product pages
Signe
NOSA is the official distributor in Taiwan for Zuiver, Dutchbone, Samoa Italia and other brands. Our Taichung showroom can be visited by appointment, so once you've taken your measurements you're welcome to come and sit on the piece before deciding. Nationwide delivery in Taiwan.