A sofa can fit the wall and still overpower the room.
This calculator answers a narrow first question: how much usable wall and open floor depth remain after the sofa is placed. It compares the complete outside sofa dimensions with the clear part of the wall, not with the room name, floor area, or the mattress-like seat dimensions shown in some product descriptions.
The result deliberately separates three signals. Side clearance shows whether the sofa is crowded by trim, radiators, tables, or nearby openings. Open depth shows the floor remaining in front. Wall used describes visual scale, because two sofas can leave the same side gap while occupying very different shares of their available wall.
Worked example
A 240 cm sofa on a 300 cm usable wall
A living room has a 300 cm clear wall and 300 cm of usable depth. The shortlisted sofa is 240 cm wide and 100 cm deep.
Usable wall
300 cm
Usable room depth
300 cm
Sofa footprint
240 x 100 cm
How RoomFact reads it
The sofa leaves 30 cm at each side, 200 cm of open depth, and uses 80% of the usable wall. RoomFact marks this as workable with a taped test rather than automatically comfortable.
The side clearance is not the concern in this example. The 80% wall share is what makes the sofa visually dominant.
A narrow console, side table, floor vent, curtain stack, or door casing can consume part of the apparent 30 cm gap.
The 200 cm open depth is not automatically a walkway. Coffee tables, chairs, and the route through the room still need their own footprints.
01
Measure the usable wall, not the wall-to-wall room width
Start and stop at the first fixed obstruction that the sofa cannot overlap. Door trim, baseboard heaters, deep radiators, low windows, built-ins, and the space needed for a curtain to stack can shorten the usable wall. Record the reason beside the measurement so a later plan does not accidentally restore unavailable space.
Use the manufacturer's maximum outside width and depth. Include arms, projecting frames, loose-back cushions at their normal position, and any recliner clearance stated by the manufacturer. A seat-width specification is not a furniture footprint.
02
Separate room scale from delivery access
A green room-scale result does not mean the sofa can reach the room. Check the packaged dimensions, removable components, tightest doorway, halls, stairs, elevator, and the turning space immediately before the destination. The doorway and stairway tools screen those constraints separately because combining them into one optimistic result would hide the actual failure point.
Before ordering, tape the full sofa rectangle on the floor and build the height with removable tape on the wall. Sit at normal eye level, open nearby doors and drawers, and walk the real route. The tape test reveals circulation and sight-line problems that a width percentage cannot represent.