Guide · For the trade
Should the rug go under the couch? Front legs, all legs or none, and when each is right
Yes, the rug should go under the couch: at minimum the front legs sit on it, with 6 to 12 inches of rug showing past each arm, and in most living rooms that means the rug runs 12 to 24 inches under the sofa from the front edge of the seat. The full layout, all legs of every piece on the rug, is better when the room allows it, and the floating layout, rug in front of the sofa with no legs on it, is the one that reads as a mistake. The sofa decides the rug's width; the room decides how far it runs.
This guide is for the designer or the junior placing a seating group on a plan who needs the rule, the exceptions and the number of inches behind each. It covers the three placements, how far under the couch the rug should go, what changes with a 100-inch sofa, a sectional or a sofa against the wall, and the questions clients ask about the 70 percent and 18 inch rules.
The three placements, and what each says about the room
Front legs on the rug is the standard placement for a sofa against or near a wall. The rug carries the front third of the sofa and the whole coffee table, and the chairs across from it sit with their front legs on as well. It uses an 8x10 in most rooms and a 9x12 in a large one, and it is the layout that forgives an awkward room because the rug only has to reach the seating, not the walls.
All legs on the rug is the full placement: every piece in the group, sofa included, sits entirely on the rug with 6 to 12 inches of rug beyond the back legs. It anchors a floating group in an open plan or a great room, and it is the only placement that works when the sofa is in the middle of the floor and seen from behind. It takes a 9x12 for a standard sofa and two chairs, a 10x14 or a custom size for a sectional or a pair of sofas.
No legs on the rug, the rug floating in front of the sofa, is the one to avoid, with one exception: a narrow runner in front of a sofa pushed against a wall in a hall-like space where there is no room for anything else. Even then, a 6x9 with the front legs on is usually the better answer than a 3x8 with none.
How far under the couch should the rug go?
Measure from the front of the seat cushion, not the front of the leg. The rug should run at least 12 inches under the sofa so the front legs sit a hand's width inside the edge rather than on it, where a leg rocks and the edge curls. Running the rug 24 inches under, roughly to the midpoint of a 36 to 40 inch deep sofa, looks more deliberate and keeps the rug from sliding back under the seat over time. Sofas with a plinth base or a skirt need the rug to run far enough that the base sits on it, usually 18 inches or more, or the base will tip the rug's edge.
Rug placement under the couch: the numbers
| Placement | Rug under the sofa | Rug past each arm | Usual size for an 84 to 90 inch sofa | Use it when |
|---|---|---|---|---|
| Front legs on | 12 to 24 in from the seat front | 6 to 12 in | 8x10 | Sofa against a wall, rooms up to 13 by 15 ft |
| All legs on | Full depth plus 6 to 12 in behind | 12 to 18 in | 9x12 | Floating sofa, open plan, large room |
| Front legs on, sectional | 12 to 24 in under both arms of the L | 6 to 12 in on the open sides | 9x12 or 10x14 | Chaise under 90 in; see the sectional guide for longer |
| Floating | 0 in | n/a | Not recommended | Only a runner in front of a wall sofa with no other option |
Which way the rug runs
Set the rug's long side parallel to the sofa. An 8x10 under a 90-inch sofa shows 15 inches past each arm with the 10-foot side along the sofa; turned the other way it shows 3 inches, which is why a rug that is the right size can still look wrong on the plan. Center the rug on the sofa, not the room, unless the room has a fireplace or a window wall that the sofa itself is centered on. If the coffee table sits off-center to leave a walkway, leave it; the rug stays centered on the sofa.
What rug size works for a 100-inch couch?
A 100-inch sofa needs a rug at least 112 inches long along the sofa, so a 9x12 is the floor, placed with the 12-foot side parallel to the seat, showing 22 inches past each arm. An 8x10 shows 10 inches a side, which is acceptable only with the front legs on and a wall behind. For the full placement, or for a 100-inch sofa with a pair of lounge chairs opposite, go to 10x14 or a custom size: a bound rug 10 feet by 13 feet cut from broadloom is often a better fit than either standard size, and it ships in 3 to 5 weeks. The living room rug size guide gives the size table by room; the sectional guide covers the L and the U.
The sofa against the wall, and the sofa in the open
With the sofa against the wall the rug's back edge can sit anywhere from 12 inches under the seat to 6 inches off the baseboard; the client will never see that edge, so size the rug for the front of the group and the walkway. With the sofa floating, the back edge is on view, and the rug has to run 6 to 12 inches past the back legs or the sofa looks parked on the rug's edge. That one difference is why a floating sofa almost always moves the spec up a size.
What to specify with the rug
A pad under any rug that carries furniture legs: 1/4 inch felt-and-rubber on hardwood or stone, a thin rubber pad over wall-to-wall carpet so the rug does not creep. Keep pile under 3/4 inch where a sofa leg or a plinth sits on it so the base does not sink and rock; flatweaves, low hand-knotted and bound broadloom carry furniture best. Tell the installer where the sofa's front edge lands on the plan so the rug is placed to the furniture, not the room, and have the furniture set the same day.
Questions designers ask
What is the 2-2-1 rule for sofas, and does it change the rug?
As it is usually repeated, 2-2-1 is a seating-group shorthand: two sofas or a sofa and two chairs around one table. It does not change the rug rule. Whatever the group, the rug runs 6 to 12 inches past the outside of the seating on the open sides and carries at least the front legs of every piece, which for a two-sofa group facing across a table usually means a 9x12 with both sofas' front legs on.
What is the 70 percent rule for rugs?
The rug covers about 70 percent of the floor in the seating area, leaving the remaining 30 percent as floor at the walls. In a 12 by 15 room that puts the rug at roughly 8x10 to 9x12. It is a check on the rug's size against the room; the sofa placement rules above check it against the furniture, and the spec should pass both.
What size rug is best for a 100-inch couch?
9x12 with the front legs on, 10x14 or a custom size with all legs on. Anything under 9 feet long shows less than 10 inches past the arms and reads as too small.
What is the 18 inch rule for rugs?
Leave 18 inches of bare floor between the rug's edge and the wall in a standard room, 12 inches in a small one and up to 24 inches in a great room. It keeps the rug reading as a placed piece rather than a badly fitted carpet, and it sets the maximum rug size once the sofa rule has set the minimum.
Should the rug go under the TV stand or the console behind the sofa?
No to both in most rooms. The rug belongs to the seating group; the media wall and the console are furniture against walls, and the 18 inch rule puts the rug's edge short of them. The exception is a very large room where the group floats and the rug is sized to all legs, in which case the console behind the sofa sits on the rug's back edge and the rug runs 6 inches past it.
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