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Tools
Measure the wall the sofa will back onto and the floor space in front of it. We will give you the largest straight sofa that fits with enough room left to reach the coffee table or let someone past.
The wall the sofa's back will sit against
To the coffee table, walkway or opposite wall
Enter the wall width and the depth in front for the largest straight sofa that fits with room to get past it.
Unlike a UK bed, no regulation sets sofa dimensions — every maker cuts its own frame. In practice a 2-seater runs 140-180cm wide, a 3-seater 198-229cm, both roughly 85-100cm deep including the back cushion. This calculator works from the middle of each range, which is why the result is a size category to shop for rather than one exact model.
In front of a sofa, 45cm is the minimum to reach a coffee table without standing up — comfortable is closer to 60cm. Where that same space is also how people reach the rest of the room, it wants 90cm instead, the same figure this site uses everywhere for 'a person can pass.'
This calculator covers straight sofas only. A corner or chaise sofa is not a rectangle — the two legs of the L are usually different lengths — so checking its fit means measuring both legs against the two walls it will actually sit along, not one width-and-depth pair.