Step-by-step guide

Planning a Dining Table for 6 (3 Per Side)

A single-family house dining room built around a rectangular table with 3 chairs on each long side is sized from four things in sequence: the tabletop itself, the chairs, the clearance around it for seating and passage, and — if needed — the extra length to add a 7th seat at the head of the table.

Size the tabletop

Length comes from allowing 600–700 mm (24–28 in) per seat along each long side — 3 seats per side gives a length of 1800–2100 mm (71–83 in). Width is set separately, by the depth needed for place settings on both sides plus a shared serving zone down the middle: 900–1000 mm (35–39 in), regardless of how many seats are on the long sides. In a dedicated dining room with room to spare, the upper end of the length range (2100 mm / 83 in) gives noticeably more comfortable elbow room during full dinners.

View table size reference →View table height reference →

Length (3 per side @ 600 mm/seat)Minimum

1800 mm71 in

Length (3 per side @ 700 mm/seat)Recommended

2100 mm83 in

WidthRange

900–1000 mm35–39 in

Per-seat width allowanceRange

600–700 mm24–28 in

Standard tableRange

711–762 mm28–30 in

Add the chairs

Dining chair seat height is paired with table height to leave comfortable knee clearance beneath the tabletop — roughly 254–305 mm (10–12 in) between the two. Chair width is typically 450–500 mm (18–20 in), which is what the 600–700 mm per-seat allowance from Step 1 already accounts for, including the gap needed between adjacent chairs.

View dining chair seat height reference →

Standard seat heightRange

432–483 mm17–19 in

Reserve clearance around the table

Beyond the table itself, each side needs clear floor space to pull out a chair and sit down: 760 mm (30 in) minimum. Any side that also serves as a walkway — common in an open-plan kitchen/dining/living layout — needs 915–1065 mm (36–42 in) instead, so someone can pass behind a seated diner.

View wall clearance reference →

Minimum (seating only)Minimum

760 mm30 in

Seating + walkwayRecommended

915 mm36 in

Seating + service walkwayRange

1065 mm42 in

Combine into a full footprint

The table plus clearance on all four sides gives the total floor area a dining zone needs to reserve. For a 1800–2100 mm table (900–1000 mm wide) with 900–1000 mm clearance on the long sides:

Dining zone lengthRange

≈3600–4100 mm≈142–161 in

Dining zone widthRange

≈2700–3200 mm≈106–126 in

Putting it together

Table length (1800–2100 mm) + clearance × 2 (2 × 900–1200 mm) = ≈3600–4100 mm (142–161 in) of room lengthfor the dining zone alone, with a similar calculation across the table’s 900–1000 mm width giving ≈2700–3200 mm (106–126 in) of room width. Use the higher end of every range where a side of the table also serves as the main path between the kitchen and the rest of the house.

Adding a seat at the head of the table

A seat at the end of the table doesn’t need the 600–700 mm side-seat allowance — it already gets the table’s full 900–1000 mm width as elbow room. What it does need is extra table length for the place setting and knee clearance: 400–600 mm (16–24 in), with 450–500 mm as a comfortable middle ground. For the 1800–2100 mm table from Step 1, that brings total length to ≈2250–2600 mm (89–102 in) for 7 seats.

View head/end seat reference →

Minimum additionMinimum

400 mm16 in

Recommended additionRecommended

450–500 mm18–20 in

Generous additionMaximum

550–600 mm22–24 in

Check the leg or apron position at the table's end — a corner-leg design can block the new seat's knees; a pedestal base or inset legs avoid this.
Clearance behind the new end chair should still meet standard dining table wall clearance (760–1065 mm / 30–42 in).
Adding a seat at both ends (8 total, symmetric look) simply doubles this addition, one at each end of the table.