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What size rug your room needs — and what each size would actually do to the echo. A rug is usually the largest piece of soft material anyone adds to a room, so this is the decision that changes how it sounds.
The sensible default for a living room.
7 × 10 · 8 × 10 · 9 × 12 · 10 × 14
These sizes all work. The largest one you can live with will do the most for the sound.
Leave roughly 18 inches of bare floor between the rug and the walls. The rug should reach at least the front legs of every seat — ideally all the legs.
Your room is currently around 1.42s of reverberation. Here's where each rug size lands it.
| Rug size | Floor covered | Reverb after | Change |
|---|---|---|---|
| 3 × 5 | 6% | 1.31s | −8% |
| 4 × 6 | 10% | 1.25s | −12% |
| 5 × 8 | 17% | 1.16s | −19% |
| 6 × 9 | 23% | 1.09s | −23% |
| 7 × 10recommended | 30% | 1.03s | −28% |
| 8 × 10recommended | 34% | 0.99s | −31% |
| 9 × 12recommended | 46% | 0.90s | −37% |
| 10 × 14recommended | 60% | 0.81s | −43% |
| 12 × 15 | 77% | 0.73s | −49% |
Identical footprint. The only difference is pile and what's underneath.
| Construction | Reverb after |
|---|---|
| Plush or shag pile, with a felt padThe most absorbent thing you can put on a floor without building anything. | 0.66s |
| Medium pile, with a felt padThe sensible default for a living room. | 0.81s |
| Medium pile, no padSame rug, straight onto the floor. Roughly half the absorption. | 1.09s |
| Low pile or flatweave, no padLooks great, does very little for sound. | 1.28s |
Buy the pad. It costs a fraction of the rug, nobody ever sees it, and on these numbers it does more for the sound of the room than going up a rug size does. A felt pad also stops the rug creeping and makes it last longer, which is why the flooring trade recommends one anyway.
Every seat should have at least its front legs on the rug. If the rug only floats in the middle under the coffee table, the room reads as unfinished and the rug is too small to do much for the sound either.
Roughly 18 inches of bare floor between rug and wall looks deliberate. Much more and the rug looks marooned; much less and it reads like wall-to-wall carpet that shrank.
The short version, by room:
Living room. Leave about 18 inches of bare floor between the rug and the walls, and make sure at least the front legs of every seat sit on the rug. For most rooms that means an 8 × 10 or a 9 × 12. The most common mistake is buying a 5 × 8, which ends up floating under the coffee table looking like a bath mat.
Bedroom. The rug should extend roughly 18 inches past each side and the foot of the bed, so you step onto it when you get up. Slide it under the bottom two thirds of the bed — the part under the headboard is rug you paid for and will never see.
Dining room. Allow 24 to 30 inches clear past every edge of the table so chairs stay on the rug when pulled out. This is the rule people break most often, and you notice it every single time someone sits down.
Yes, and usually more than anything else you can buy for the money — but it depends enormously on which rug. Run the numbers above and you'll see the same size rug landing in very different places depending on pile and underlay.
The reason is that absorption comes from sound getting into a porous material and losing energy there. A thick pile over a felt pad gives it somewhere to go. A flatweave laid straight onto a hard floor is barely different, acoustically, from the floor itself.
A felt pad adds thickness and, more importantly, a layer of trapped air between the rug and the hard floor beneath. That combination extends the rug's absorption downward in frequency — the same physics that makes an acoustic panel spaced off the wall outperform one screwed flat to it.
In practical terms: if you're choosing between a bigger rug and a good pad under a smaller one, the pad is usually the better buy. You can check the underlying figures in our absorption coefficient table — compare the entries for carpet on felt underlay against the same carpet laid on concrete.
A rug treats the floor, which is one surface out of six, and it does most of its work at higher frequencies. If your room booms rather than echoes, a rug will barely touch it — look at the 125 Hz column for any carpet and you'll see why.
It also does nothing for sound passing between rooms. That's soundproofing, which is a different problem with a different and much more expensive answer.
If you want to know what your room is doing before you spend anything, the studio sound check measures it from a ten-second recording, and the panel calculator covers what to do about the walls.