The most common rug mistake we see is buying one that is too small. A 5′ × 8′ looks big rolled up in the store and lost once it is down in a 12′ × 15′ living room. A rug that is too small makes the room look smaller and the furniture look like it is floating. This calculator does the measuring math for you: tell it the room and what the rug goes under, and it gives you the standard size that fits, the smallest size that still works, and how much bare floor you will see at each wall.
Rug Size Calculator
Measure the room wall to wall in feet. Use decimals for inches: 11′6″ is 11.5. Furniture is in inches.
How the Calculator Decides
Every recommendation balances two limits. The rug has to be big enough for the furniture it anchors, and small enough to leave a border of bare floor between the rug and the walls. The calculator checks both against the standard sizes rugs are actually sold in: 3′ × 5′, 4′ × 6′, 5′ × 8′, 6′ × 9′, 8′ × 10′, 9′ × 12′, 10′ × 14′ and 12′ × 15′, plus 6′, 8′ and 10′ squares for round dining tables.
- Border of floor: we aim for 18 inches at each wall in living and dining rooms where both dimensions are 11 feet or more, and 12 inches in smaller rooms and in bedrooms, where the bed and dressers cover most of the edges anyway. If nothing fits with that border, we will accept as little as 8 inches and tell you it is tight.
- Orientation: the rug’s long side runs along the room’s long side, which is how nearly every room is laid out.
- Three answers: the smallest size that meets the rule, the ideal size for the layout, and the largest standard size the room can hold. The recommendation is the ideal size if the room allows it, otherwise the biggest size that still meets the rule.
Living Room Rules
| Layout | Minimum Rug Width | Minimum Depth | What It Looks Like |
|---|---|---|---|
| Front legs on | Sofa length + 12″ (6″ past each end) | 5′ (6′ for sofas 8′ and longer) | The most common and forgiving layout. Back legs on the floor, front legs on the rug. |
| All legs on | Sofa length + 24″ | 8′ | The rug defines the whole seating area. Needs a big room and a big rug, usually 9′ × 12′ or larger. |
| No legs on | About two-thirds of the sofa length | 4′ | Works in small rooms and apartments. In an average room it usually looks too small. |
For a sectional, use the length of the longest side. For a room with a sofa and two chairs facing it, the front-legs rule still applies to both: if the chairs can’t reach the rug, it is too small.
Dining Room Rules
Dining rugs follow one rule: the table edge plus at least 24 inches on every side, and 30 inches is better. That is roughly how far a chair slides back when someone stands up. If the rug is smaller, the back legs of the chair catch on the edge every meal. So a 72″ × 40″ table needs a rug at least 120″ × 88″, which is an 8′ × 10′. Measure with any leaves in that you use regularly. A round table gets a round or square rug at least 48 inches larger than its diameter.
Bedroom Rules
Under a bed, the long side of the rug runs across the bed and the rug covers the lower two-thirds of it, stopping a few inches before the nightstands. What you are paying for is the rug that shows on each side, where your feet land in the morning. The calculator looks for at least 18 inches showing on each side and ideally about 30.
| Bed | Mattress Width | Works | Ideal |
|---|---|---|---|
| Twin / Twin XL | 38″ | 5′ × 8′ | 6′ × 9′ |
| Full | 54″ | 5′ × 8′ or 6′ × 9′ | 8′ × 10′ |
| Queen | 60″ | 6′ × 9′ (5′ × 8′ at a pinch) | 8′ × 10′ |
| King / Cal king | 76″ / 72″ | 8′ × 10′ | 9′ × 12′ |
Worked Examples
A 12′ × 15′ living room with an 84″ sofa
Front legs on: the rug must be at least 96 inches (8 feet) wide, and ideally 108 inches. The room can hold a rug up to 12 feet long and 9 feet wide with an 18-inch border. An 8′ × 10′ meets the ideal, fits, and leaves about 2 feet of floor on each long wall and 2½ feet at each short wall. That is why 8′ × 10′ is the most common correct answer in American living rooms.
A 10′ × 11′ dining room with a 60″ round table
The rug needs to be at least 108 inches across, a 9-foot round or square. A 10-foot square would leave no floor at the 10-foot walls, and an 8-foot rug is too small: chair legs would drop off the edge every time someone stood up. The calculator will tell you no standard size fits. That is a useful answer, because the real problem is the table. A 48″ round needs only an 8-foot round or square rug and still seats four comfortably, or you can skip the rug in a room this size.
Rug Sizing Mistakes We See
- Buying by the photo. Listing photos are styled with small furniture to make the rug look larger. Go by the numbers.
- Forgetting the leaf. A dining table that is 60 inches every day and 78 inches at Thanksgiving needs the rug sized for 78.
- Ignoring door swing. A thick rug plus pad can stop a door from opening. Measure the gap under any door that swings over the rug.
- Skipping the tape test. Mark the rug outline on the floor with painter’s tape and leave it for a day. It costs nothing and catches almost every mistake.
Once you know the size, our area rug buying guide covers fibers, construction, pile height and pads.
Frequently Asked Questions
What size rug goes in a 12 x 15 living room?
In most 12′ × 15′ living rooms an 8′ × 10′ rug is the right size. It is large enough for the front legs of a standard sofa and chairs and leaves about 2 feet of floor showing on each side. A 9′ × 12′ works if you want all furniture legs on the rug.
How much floor should show around an area rug?
Aim for 12 to 18 inches of bare floor between the rug and the walls. In a small room 8 to 12 inches is fine; in a large room up to about 24 inches still looks intentional.
What size rug do I need under a queen bed?
An 8′ × 10′ is the usual choice for a queen bed, placed with the 10-foot side across the bed. A 6′ × 9′ also works and leaves about 2 feet showing on each side.
How much bigger than the table should a dining rug be?
At least 24 inches larger on every side, so chairs stay on the rug when someone pulls back to stand. That means adding 48 inches to both the length and width of the table. Thirty inches per side is better.
Should the rug be wider than the sofa?
Yes. The rug should extend at least 6 inches past each end of the sofa, and 8 to 12 inches looks better. A rug narrower than the sofa makes the sofa look oversized.