Measured. Fit.
Clearance, height, and “will it work” ergonomics
Living-Room Clearances and Walkways: Every Gap, in Inches
The numbers that decide whether a living room works are the gaps between the pieces, not the pieces themselves. Sofa to coffee table, seat to screen, walkway widths, chair pull-out room, and door swing, all as measured distances you can tape out before anything ships.
The gaps around the sofa
Once the sofa is sized to the room and the rug sized to the sofa, the rest of the living room is a set of gaps, and every one is a number you can tape out. Start with the coffee table, the clearance you feel every day. Leave 14 to 18 inches between the sofa's front edge and the table: closer than 14 and your shins hit it, past about 20 and you perch on the edge of the seat to set a cup down. Height matters as much as the gap. A coffee table should sit level with the sofa's seat cushion or up to 2 inches below it, never above, which is why most land at 16 to 18 inches. The two-thirds rule sets the table's length and the height rule sets its top; this guide is the air in between.
Seat to screen
Viewing distance is a resolution question now, not only a size one. For a 4K set, sit about 1 to 1.5 times the screen's diagonal away; for older 1080p, about 2 times, because the coarser pixel grid shows up close. In practice a 55-inch 4K TV wants roughly 4.5 to 7 feet (about 55 to 83 inches), a 65-inch wants 5.5 to 8 feet, and a 75-inch wants 6 to 9.5 feet. Measure from the front of the screen to the sofa's seat back, and fold the TV stand's depth into the same budget so the screen does not end up farther forward than you planned.
Walkway widths
A path people use every day needs 30 to 36 inches of clear floor, the same as a doorway, so nobody turns sideways to pass. A secondary route that gets used occasionally can drop to about 18 inches, the tight squeeze where one person edges through. Below 18 inches it stops being a walkway. When a sofa floats in the room instead of sitting against a wall, the space behind it is a walkway too: leave 30 to 36 inches so the path stays usable and a console table behind the sofa does not choke it.
Room to pull a chair out
A dining chair set needs floor behind it to slide back and stand up. Leave about 36 inches from the table edge to the nearest wall or obstacle, which covers pulling the chair out and getting into it. Where a walkway runs behind seated diners, widen that to 44 to 48 inches so someone can pass behind an occupied chair. Undersize this and the chairs on the wall side cannot be used, which quietly turns a six-seat table into a four-seat one.
Door and cabinet swing
The last clearances are the ones that move. An interior door sweeps an arc as wide as the door itself, so a 30-inch door claims a 30-inch quarter-circle of floor that no furniture can sit in. Cabinet doors and drawers borrow the walkway in front of them, extension tables grow 12 to 24 inches per leaf, and a recliner needs open space behind it to lie back. Measure every piece at its largest, open and extended, not its closed showroom pose. When the real question is whether a piece can physically reach the room, the will-it-fit calculator runs the door, stair, and diagonal math, and the six-dimension checklist is the full list to measure before you buy.