Bedroom rugs are sized by the bed, not by the room. That one shift accounts for most of the difference between a bedroom that works and one where the rug looks stranded.
The brief is also unusually specific: the rug exists mainly so that your feet land on something warm. Everything below follows from that.
The three arrangements
- Two-thirds under
- Rug starts below the bedside tables. The best value.
- Fully under
- Bed and tables all on the rug. The most generous.
- Runners each side
- Two runners, no rug under the bed. Small rooms.
- A rug at the foot only
- The one that does not work.
Two-thirds under — the default
The rug starts roughly two-thirds of the way down the bed, so it passes under the lower portion of the mattress and extends past the sides and the foot.
It is cheaper than going fully under, because you are not paying for rug that lives under a headboard nobody sees, and in most rooms it looks better — the bed reads as sitting on something rather than as marooned in the middle of a rectangle.
Margin: 45–60cm of rug beyond the bed at the sides and foot.
Fully under
Bed and both bedside tables sit entirely on the rug, with margin all round.
The most generous version, and the right one in a large room or where the floor is cold or unattractive. It needs a bigger rug and it is worth it when the room takes it.
Margin: 60cm+ at the sides and foot, plus the depth of the bedside tables.
Runners each side
Two runners, one down each side of the bed, sometimes with a third at the foot.
Right in a small room where any single rug would crowd the walls, and right where you want to use a good rug that is too small to serve as a bed rug on its own. Also the cheapest way to solve the actual problem, which is where your feet land.
Size: 60–75cm wide, running most of the bed's length.
The one that does not work
A small rug at the foot of the bed, touching nothing.
It is the bedroom version of the universal undersizing error: it reads as an island, it fragments the room, and it does nothing about the floor you actually step onto — layout rules for area rugs.
The figures
| Bed | Mattress | Two-thirds under | Fully under |
|---|---|---|---|
| Single / Twin | 90 × 190 cm | 5×8 | 6×9 |
| Double / Full | 135 × 190 cm | 6×9 | 8×10 |
| Queen | 150 × 200 cm | 8×10 | 9×12 |
| King | 180 × 200 cm | 9×12 | 10×14 |
| Super king | 200 × 200 cm | 9×12 | 10×14 |
The king-bed error
An 8×10 under a king bed is the most common bedroom sizing mistake. A king is 180cm wide, so an 8-foot (244cm) rug leaves about 30cm each side — and once the bed is not perfectly centred, one side has almost nothing. You step off the rug onto cold floor, which is the precise failure the rug was bought to prevent. Go to 9×12.
Checking it before you buy
The tape test applies here as everywhere, with one bedroom-specific addition: do it at the time of day you actually get out of bed, and stand where you actually stand.
- Tape the intended footprint on the floor.
- Get into and out of the bed on both sides.
- Check that your feet land inside the tape every time, including the first sideways step.
- Open the wardrobe and any door, and check nothing catches.
Full method in how to measure for an area rug.
Two things that change the answer
Bedside tables. If the tables sit on the rug, add their depth to the required margin — usually 40–50cm each side. If they sit off it, the rug edge should pass beneath the bed rather than stopping just short of the tables, which produces a visible gap.
A bench or blanket box at the foot. Same rule as living-room furniture: it should sit on the rug rather than off it, which usually pushes you one size up.
Small rooms
Where the room genuinely will not take a bed rug:
Runners each side is the honest answer, and it solves the real problem.
One runner on the side you get out of, if the bed is against a wall.
A rug in front of a chair or window seat instead, treating the bedroom's seating area as the zone rather than the bed.
What not to do is buy a small rug for the middle of the floor. In a small room that is the arrangement most likely to make the space read smaller still.
Then the rest
Bedrooms are the one room where comfort legitimately beats durability, because traffic is low and you are barefoot — which changes what to buy as well as what size. See best materials for bedroom rugs and placing bedroom rugs.
Common questions
What size rug goes under a queen bed?
8×10 is the standard answer, positioned so the rug starts about two-thirds of the way down the bed and extends 45–60cm past the sides and foot. A 9×12 works if the room takes it and lets you run the rug under the bedside tables as well.
What size rug for a king bed?
9×12 as the working standard, or 10×14 in a large room. An 8×10 under a king is the most common bedroom sizing error — it leaves too little margin at the sides, so you step off the rug onto cold floor, which is the exact thing the rug was bought to prevent.
Should a rug go under the whole bed?
It does not need to. Starting the rug about two-thirds of the way down the bed is cheaper, looks better in most rooms, and covers the floor you actually step onto. The area under the headboard was never seen.