Worked out, one size at a time

Seating chart by guest count

Pick your number. Each page gives the table count at every sensible table size, the floor space the room actually needs once a dance floor and a bar are in it, what to do about the top table at that size, and roughly how many keep-together and keep-apart pairs a list that long tends to carry.

50 guests 7 tables of 8 · ~1065 sq ft 60 guests 8 tables of 8 · ~1218 sq ft 80 guests 10 tables of 8 · ~1524 sq ft 100 guests 13 tables of 8 · ~1830 sq ft 120 guests 15 tables of 8 · ~2136 sq ft 150 guests 19 tables of 8 · ~2595 sq ft 180 guests 23 tables of 8 · ~3054 sq ft 200 guests 25 tables of 8 · ~3360 sq ft 250 guests 32 tables of 8 · ~4125 sq ft 300 guests 38 tables of 8 · ~4890 sq ft

Why the number changes the advice

Fifty guests and three hundred are not the same problem made bigger. At fifty you can hold the whole room in your head, a sweetheart table is a real option, and the risk is a last table with two people at it. At three hundred you are laying out thirty-odd tables, the top table needs raising or half the room cannot see it, and a single late change can move people at four different tables.

Wherever you are on that scale, the arithmetic is the easy half. What takes the week is that moving one person breaks something three tables away — and nothing on a spreadsheet tells you which.