Calculator + chartEnter your measurements below and it works the answer out.
A dining rug needs at least 24 inches of rug past every edge of the table — 30 is better — so a chair stays on the rug when someone pushes back to stand. Enter your table below and it works out which stock size does that.
| Table | Seats | At 24 in clearance | At 30 in clearance |
|---|---|---|---|
| 36 × 48 in rectangular | 4 | 8 × 10 ft | 8 × 10 ft |
| 36 × 60 in rectangular | 6 | 8 × 10 ft | 9 × 12 ft |
| 40 × 72 in rectangular | 6–8 | 8 × 10 ft | 9 × 12 ft |
| 40 × 84 in rectangular | 8 | 9 × 12 ft | 9 × 12 ft |
| 40 × 96 in rectangular | 8–10 | 9 × 12 ft | 10 × 14 ft |
| 44 × 120 in rectangular | 10–12 | 10 × 14 ft | 12 × 15 ft |
| 36 in round | 4 | 6 ft round or 8 × 10 | 8 ft round or 8 × 10 |
| 48 in round | 4–6 | 8 ft round or 8 × 10 | 8 ft round or 9 × 12 |
| 60 in round | 6–8 | 9 × 12 ft | 9 × 12 ft |
| 72 in round | 8 | 10 × 14 ft | 10 × 14 ft |
Sized so the rug clears the table by the stated amount on every side, then rounded up to the nearest stock rug. A round table can take a round rug, but a rectangular rug under a round table is common and gives more room for the chairs at the diagonals.
The rule is about the chair, not the table. A dining chair travels roughly 20 to 24 inches back from the table edge when someone stands up. If the rug stops short of that, the back legs drop off the edge — the chair tips, and the rug edge frays where it is caught every meal.
So: table dimension + twice the clearance. A 40 × 72 in table at 30 inches of clearance needs 40 + 60 = 100 in and 72 + 60 = 132 in, which is 8 ft 4 in by 11 ft. Round up to stock and that is a 9 × 12.
24 inches is the floor, 30 is the target. Twenty-four works with light chairs on a hard floor. Thirty is what most designers specify because it handles armchairs and carvers, and because nobody measures where they push their chair to.
Then check the room. Leave at least 6 to 12 inches of floor between the rug and the walls, and keep it clear of a door swing. If the rug that fits your table does not fit your room, the answer is usually a smaller table rather than a smaller rug — a rug that fails the chair test is worse than no rug.
Extending tables. If your table has leaves and you use them for guests, size the rug to the extended length. It is the meal with twelve people at it where a chair going off the edge actually matters.
At least 24 inches larger on every side, so 48 inches larger overall in both directions. Thirty inches a side is the more common recommendation and handles armchairs.
An 8 × 10 at 24 inches of clearance, or a 9 × 12 at 30. A six-seat table is usually around 40 × 72 inches, which needs 88 × 120 at the minimum clearance — and 8 × 10 is 96 × 120.
It is a choice, not a rule. A rug defines the dining area in an open-plan room and softens the sound, but it also collects everything anyone drops. A flatweave or an indoor-outdoor rug is the usual compromise, because both clean.
Either works. A round rug echoes the table and suits a square room; a rectangular rug under a round table gives the chairs more room at the diagonals, which is where they run out of rug first.
Then the table is too big for the room, and a smaller rug will not fix that. A rug that a chair falls off is worse than a bare floor, so the honest options are a smaller table or no rug.
Yes — size it to the extended length if you actually use the leaves. That is the meal with the most chairs at it and the one where a chair leg going over the edge matters most.