A party for thirty, counted backwards

Count backwards from the table, not forwards from the shelf

Every over-bought party starts the same way. Somebody opens a catalogue, sees a pack of a hundred and forty-four for the price of a sandwich, and buys it. Two weeks later there is a cupboard with a hundred and nine paper straws in it and a birthday that needed thirty-five.

The fix is not restraint. It is doing the arithmetic in the other direction: start from the number of people, work out how many of each thing one person uses, and only then look at what the shelf sells. It takes about four minutes and it is the difference between a party that costs what you expected and one that quietly costs twice as much in things nobody opened.

Blulu's Party & Celebration shelf is 239 lines, the largest department in the range, and the counts on it run from a pair up to 5000 pieces. That spread is exactly why the direction of the sum matters.

What one person actually gets through

These are the figures that make the sum work. They are not a rule from anywhere, they are the ordinary arithmetic of a table, and they are worth writing down because everyone guesses them differently in a shop.

• Napkins: two to three each. One goes under a plate and is never seen again, one gets used, and the third exists because somebody spills something.
• Cups: one and a half each. Nobody keeps track of their cup after the first hour. This is the single most under-bought item at any party with children.
• Plates: one and a half each at a party with cake, because savoury and sweet do not share a plate willingly.
• Favours and small toys: one each, plus five per cent for breakage and the sibling nobody counted.

Balloons: three per metre of anything you intend to decorate, and ten per cent spare, because a proportion of any pack will not survive inflation.

Decorations that hang: measure first. Bunting and garlands are sold by length, and a room is bigger than it looks from a sofa.

100 Piece Mardi Gras Napkins Party Decorations Happy Mardi Gras, Multicolour

Table supplies are the items a party runs out of first, so they are counted per head rather than per pack.

$14.59 $0.15 each

Multiply, add the spare, and you have your target count. Now the shelf becomes useful rather than tempting.

The pack sizes this shelf actually sells

Once you know the target, the question is which pack lands nearest above it. Here is what the department offers, counted from the range itself:

Per-piece figures are rounded up to the cent, so the number you read is never lower than the number you pay.

Two things fall out of that table. The first is that the per-piece figure improves fast at the small end and then flattens: the jump from twelve to fifty is enormous, the jump from two hundred to four hundred is often marginal. The second is that the flattening is where over-buying lives, because that is exactly the point where the bigger pack still looks like a better deal and no longer is.

A worked example: thirty people, one afternoon

Thirty guests, a cake, a two hour window, and a room with about eight metres of wall worth decorating.

• Napkins. 30 x 3 = 90. Buy the hundred, not the fifty and another fifty.
• Cups. 30 x 1.5 = 45. The pack of fifty is right. The pack of twenty-four is two packs and a trip.
• Plates. 30 x 1.5 = 45, same answer.
• Favours. 30 plus five per cent is 32. A pack of thirty-six is right. A pack of a hundred is sixty-eight favours looking for a home.
• Balloons. 8 metres x 3 = 24, plus ten per cent for failures is 27. The pack of thirty is right.
• Bunting. Eight metres means eight metres, and the length is printed on the pack rather than implied by the piece count.

Total: six decisions, no leftovers worth storing, and one cupboard that still closes. The same six sums with the numbers changed cover a classroom of twenty-eight or a wedding of ninety.

200 Piece Cocktail Picks Fancy Toothpicks, Red

A pack in the fifties covers a party of thirty with the spare that a party of thirty always needs.

$7.99 $0.04 each

The one case where over-buying is correct

There is a shelf where the advice above reverses, and it is worth naming so the rule does not get applied where it hurts. Seasonal decorations are bought once and used for years.

A garland that comes out every December is not a party consumable, it is a possession with a very low duty cycle. The right count there is the one that covers the house, and the right time to buy it is January, when what is left of the season is priced to clear.

The Seasonal shelf runs to 106 lines here, and the failure mode on it is the opposite of the party shelf: not buying too much, but buying too little of a set that will never be restocked in the same colour.

850 Piece Christmas Pony Beads Glitter Plastic Red Green White Clear

Seasonal sets are the one category where the larger count is usually the right call, because next year's dye lot will not match.

$11.99 $0.02 each

What to do with what is left

Some leftover is inevitable, and it is worth deciding what happens to it before it becomes a shelf of open bags.

Anything sealed and dated goes back in the box it came in, with the count written on the outside in marker. The next party starts from that number rather than from a guess.

Anything opened and loose goes into one container per category, not one per party. Mixed leftovers are the reason people buy things they already own.

Anything printed with a specific number or year is a consumable, however much of it is left. A "40" balloon has one job and one birthday.

The Storage & Organising shelf exists for exactly this: dividers, resealable bags and matching containers, bought as a system rather than one at a time.

Small pieces and small children

Party supplies and small children share a room by definition, and two categories deserve care rather than a warning label read after the fact.

Anything that fits in a mouth, and any piece that can break off something that fits in a mouth, is a hazard for a child under three regardless of what it was sold as. That includes favour toys, cake toppers, small decorative pieces and the fittings on the ends of bunting.

Balloons deserve a separate mention because they behave unlike other toys: an uninflated balloon or a fragment of a burst one is soft, conforms to an airway and does not clear the way a solid piece does. Adult supervision and prompt clearing of burst pieces is the whole of the advice, and it is worth following even when the party is over and the floor looks empty.

The same care applies to anything hung above where children play. A garland pinned to a shelf is a rope attached to a piece of furniture, and furniture that is not fixed to a wall behaves the way a national body describes it.

Children like to climb on furniture. For them, the home is a playground. As you childproof, you may not be aware that unsecured TVs, furniture and appliances are hidden hazards lurking in every room.

the U.S. Consumer Product Safety Commission

The fixings for that job are on the Wall & Fixings shelf, and the guide to using them is fixing things to a wall without guessing. This is published guidance quoted so you can follow it back to the source, not safety advice of our own, and the read date is on the sources page.

We publish the counts and the stated sizes for every line here. We do not publish an age rating unless the line itself states one, and we do not decide that a product is safe for a particular child. That judgement belongs with the person in the room.

A timeline that stops the last-minute order

Most of the cost of a party is decided by when the order goes in rather than by what is in it. Three points on a calendar cover it.

Three weeks out: count the people. Not the invitations, the people. This is the number every other sum multiplies, and getting it wrong by five is the difference between one pack and two.

Two weeks out: order the counted items. Napkins, cups, plates, favours, balloons. These are the things where the pack size has to land above your target, and where a second order costs delivery as well as time.

48 Piece 12 Inches Retirement Balloons Decoration Happy Retirement, Black

Decorations that hang are bought by length, so the measurement comes before the order.

$8.07 $0.17 each

One week out: order nothing. This is the window where panic buying happens, and where somebody buys a hundred and forty-four of something because it was the pack that could arrive on Friday.

The one exception is anything perishable or fragile, which wants to arrive close to the day rather than sit in a hallway being walked past.

Colour is a constraint, not a preference

Anybody who has tried to top up a colour scheme knows the problem: the second pack does not quite match the first. Dye lots move, print runs move, and a red bought in March is a slightly different red in September.

Three practical consequences. Buy a colour in one order rather than two, even if that means one pack larger than the sum says. Buy the fixed-colour items first and the neutral ones after, because white and kraft will match anything later. And if a scheme has to survive across two events, buy for both at once and store the remainder sealed with the colour written on the bag.

939 of the lines in this range state a colour, which makes the colour a searchable fact rather than something to be judged from a photograph on a screen of unknown calibration. Where a line does not state one, we do not name it.

200 Piece Dog Treat Bags Pet Paw Cellophane Bags, Multicolour

Buying a colour in one order avoids the dye-lot problem: two packs bought months apart rarely match exactly.

$8.99 $0.05 each

The twenty minutes after everybody leaves

The end of a party is when the next one gets cheaper or more expensive, and it takes about twenty minutes to decide which.

• Sort as you clear, not later. One bag for rubbish, one box for anything reusable, one for anything sealed and unopened. The third box is next year's budget.
• Write the count on the box. "17 cups, 12 plates" beats "party stuff" by an entire shopping trip.
• Deal with balloons immediately. Burst pieces on a floor are the one item on the list that is worth doing before the washing up rather than after.
• Photograph the table before it is cleared. Not for anyone else. For you, next year, when you cannot remember how many of the small things it actually took to make the room look full.

That photograph is worth more than any list, because it records the thing lists cannot: density. A table that looked generous had a particular number of items per square foot, and no amount of arithmetic recovers that after the fact. Somebody planning the same room next year starts from a picture rather than from a guess, and the order that follows is smaller and more accurate than the one before it.

What this site states, and what it leaves out

Product names on this site are written from what the line states: the count, what the thing is, the colour or size where one is given. A hundred and fifty character string of keywords is not a name, and it is not what appears here.

Where a measurement is not stated, the row is absent rather than estimated. Where a pack count is stated, it is the count printed on the packaging, so the per-piece figures on the cards can be trusted to the cent.

Prices carry the date they were last updated, stated once on the editorial policy page. Ordering, payment, delivery and returns happen at checkout, wherever you place the order.

Read next

If the next job involves a drill rather than a cake, read fixing things to a wall without guessing. If the party is over and the floor is covered in small pieces, read sorting small parts so they can be found again.

Or start from the shelves: party and celebration, seasonal, storage and organising.