The short answer: every 60 cm of extension adds one diner. A 140 cm table that seats 4 grows to seat 5 with a 40 cm leaf, 6 with a 50–60 cm leaf, and 7–8 with a butterfly leaf on each side. Plan the room around the extended length, not the daily one — that is where extendable tables disappoint.
Shop the pieces in this guide
Leaf sizes and what they actually seat
The 60 cm-per-person rule is the backbone: elbow room plus shared serving space. Leaves below 50 cm are meant for one extra chair squeezed at a pinch, not for comfort. Two 40 cm leaves on a 160 cm table take you to 240 cm — comfortably 8 people for holidays, 4 people at 160 cm every other day of the year.
| Daily table | Leaf added | Extended length | Seats |
|---|---|---|---|
| 120 cm | +40 cm | 160 cm | 4 → 5 |
| 140 cm | +50 cm | 190 cm | 4 → 6 |
| 160 cm | +60 cm | 220 cm | 6 → 7 |
| 160 cm, two leaves | +80 cm | 240 cm | 6 → 8 |
Clearance: measure the extended state
Chairs need 60 cm of depth from table edge, and you need 90–120 cm of aisle behind a seated diner for someone to pass. On a 140 cm table extended to 190 cm in a 3 m wide room, extended ends leave 55 cm on each side — chairs pull out, but nobody walks past while everyone is seated. That is acceptable for occasional holiday use, painful as a daily setup. Check both directions: extended length versus room, and remember the extended table also pushes serving traffic patterns wider.
Storage options: where the leaf lives
Three systems dominate. Butterfly leaves fold and self-store inside the table — zero closet space, the reason they dominate family listings. Drop-in leaves are separate boards; they need 40–60 cm of wardrobe depth and warp less because they store flat. Removable halves (table splits in the middle) store best of all but demand two strong hands. If you cannot say today where the leaf will live, choose butterfly — un-stored separate leaves warp within 2–3 winters in heated rooms.
Stability and the middle-leg question
A table at 220–240 cm extended with only four legs at the corners sags in the middle by a visible millimetre or two under a heavy roast. Good extendables add a centre leg or pedestal that slides with the extension. Check the mechanism slides on metal runners, not bare wood, and that a locking catch stops rattle — you will extend and collapse it dozens of times a year.
Buying checklist
Count your realistic maximum guest number, multiply by 60 cm, add 30 cm, and confirm your room handles that length with 90 cm of clearance. Prefer self-storing leaves if closet space is tight. Test the mechanism weight — one person should extend it alone in under 30 seconds, or it will stay collapsed.
Shape shifts worth knowing
Some extendables change shape, not just length: a square 90 cm table opens into a 90 x 180 cm rectangle, and a round 120 cm becomes a 120 x 180 cm oval with a leaf ring. These suit rooms that are square daily and rectangular at Christmas - the shape change keeps proportions sane in both states. Check the extended geometry on a floor model or in buyer photos: some ovals bow in the middle when the leaf seats three on one long side, which reads oddly from the head of the table.
Keep reading
More dimension guides are in the collection, and the full index is on the furnolio journal.
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