A sofa can fit the wall and still ruin the room. Enter your wall and room size and how many seats you want, and get a length and depth that leaves room to walk.
Sofa Size Calculator
How this calculator works
Each seat needs roughly twenty-three inches of width, plus room for the arms. The calculator checks that against the two-thirds rule — a sofa should take up no more than about two-thirds of the wall behind it — and picks a depth your room can spare while keeping a walkway in front. Always measure doorways and hall turns as well: the sofa has to fit the journey, not just the wall.
Good to know
A handy guide is to keep the sofa to about two thirds of the wall it sits on so the ends do not crowd side tables and lamps. Leave a little breathing room at each end rather than filling the wall edge to edge.
Seat depth of roughly 21-24 inches and a seat height around 17-19 inches suits most adults. Before ordering, measure doors, hall turns and stairs on the delivery path and compare them with the sofa diagonal and removable legs or cushions.
Frequently asked questions
How do I check a sofa will fit through doors and stairs? Measure the narrowest door, hall and stair turn, then compare with the sofa height, depth and diagonal. Remove legs and cushions if the maker allows it and allow an extra inch for hands and packaging.
How much space between sofa and TV? As a starting point, place seating roughly 1.5 to 2.5 times the TV screen diagonal away, adjusting for room shape and walkways so people can pass without squeezing.
What sofa length suits most living rooms? Two-seat sofas around 68-78 inches and three-seat around 84-96 inches are common; pick the smaller end if walkways feel tight, and leave at least 14-18 inches between sofa and coffee table.
How deep should a sofa be for lounging vs upright sitting? Deeper seats near 24 inches suit lounging, while 21-22 inches keeps feet on the floor for upright sitting. Try the depth in person if two people differ a lot in height.