Rug Size Chart

The standard rug size chart

Most rooms take one of a handful of standard rug sizes, and the table below is the short version decorators start from. A small living room works with a 5x8, a standard one with an 8x10, and a large one with a 9x12. A queen bedroom usually takes an 8x10 and a king bedroom a 9x12. A dining room needs an 8x10 for six seats, because the rug must extend 48 inches beyond the table edge on every side so pulled-out chairs stay on the rug, and a 9x12 or 10x14 for eight to ten seats. Entries take a 2x3 or 3x5, kitchens take a 2.5x8 runner, and bathrooms take a 2x3. The calculator below turns those rules into a size for your exact room, instead of asking you to guess between two chart rows.

The 18-inch rule, and how the calculator uses it

The working rule is simple: leave about 18 inches of bare floor showing on every side of the rug, so the rug reads as a defined area rather than wall-to-wall carpet. The calculator subtracts 3 feet from each room dimension (18 inches on each side) to get a target box, then picks the largest standard size — 2x3, 2.5x8, 3x5, 5x8, 6x9, 8x10, 9x12, or 10x14 — that fits inside that box, trying both orientations. If no standard size fits, it recommends the smallest size and warns you it will cover most of the floor, which is the honest answer for a very small room: a rug there is decoration, not zoning. The default room, 15 by 12 feet, gives a 12 by 9 foot box, and a 9x12 rug fits it exactly when turned so its 12-foot side runs along the room's length.

Placement notes by room

Living room: the front legs of every seat should sit on the rug; if that is impossible, all four legs of the main sofa should, and the rug should extend at least 6 inches beyond the sofa on each side. Bedroom: the rug should run under the lower two-thirds of the bed and extend about 18 inches beyond each side, so bare feet land on rug, not cold floor. Dining room: measure the table plus 48 inches on every side for pulled-out chairs, and never let a chair leg catch the rug's edge. Entry: the rug should catch the door swing without bunching and leave room for shoes beside it. Kitchen: a runner should run the length of the work zone without reaching the sink's splash zone edges. Bathroom: a 2x3 in front of the tub or vanity is enough; anything larger stays damp.

Output · formula · meaning

Who uses this

• The homeowner buying a first rug: enters the room size instead of guessing between chart rows, and learns the 18-inch rule before spending hundreds of dollars.
• The renter furnishing a small flat: checks whether any standard size fits a tiny entry or bedroom, and gets an honest warning when none does.
• The dining-room host: measures the table plus chair pull-out and finds the rug must be far larger than the table itself.
• The renovator ordering online: confirms the size before ordering, since returning a 9x12 rug is nobody's idea of a good weekend.

Accuracy & limitations

The calculator applies one rule — the largest standard size fitting a box 3 feet smaller than the room in each dimension — and the chart figures above are the usual decorator starting points, not building codes. Real rooms have doors, radiators, fireplaces, and furniture that eat into the box, and an open-plan space has no walls to measure from at all: measure the seating or dining zone, not the whole floor. Standard sizes vary slightly by maker (a 9x12 may really be 9 by 11 feet 6 inches), so measure the actual rug before buying. If your room is irregular, use the largest rectangle that fits the area the rug will occupy.