How many lots should a charity auction have? The 12 to 20 rule

The short answer is twelve to twenty lots for a typical evening of fifty to a hundred and fifty guests, of which no more than six are sold live from the stage. If your list is longer than that, you will almost certainly raise more by cutting it. That is a counter-intuitive claim, so here is the reasoning.

Attention is the currency, not generosity

Every lot competes for the same two limited things: your guests’ attention and the sum they arrived willing to spend. That sum is real and fairly stable. Most guests at a club or school evening turn up mentally prepared to part with somewhere between €75 and €250, and they will identify two or three lots they actually care about, no matter how long the list is.

With fifteen lots, that attention concentrates. Four people want the same weekend cottage, they collide, and the price runs past the estimate. Collision is the entire mechanism by which an auction raises more than a shop would. With forty lots the same attention and the same money spread thin: most lots attract one bid or none, and the average price sags back towards the opening figure.

The treasurer of a primary school went through the results of an evening with forty-six lots and found that the top twelve had produced seventy-eight per cent of the total. The bottom twenty had raised a little over three hundred euros between them, and had cost the committee roughly eleven hours of collecting, photographing, describing, printing and handing out. Nobody had ever added that up before, because the work happens in fragments across six weeks.

Do the arithmetic on the clock

A live lot takes two to four minutes once the auctioneer has introduced it and worked the room. Six lots is therefore twenty-five to thirty-five minutes, which is about as long as a room enjoys sitting still. Eight or ten live lots is fifty minutes, and by lot seven people are at the bar and the prices know it.

The silent auction needs at least sixty to ninety minutes open, and preferably longer, because bidding is not spread evenly across it. Almost everything happens in the last ten to fifteen minutes. Twenty lots in ninety minutes means a guest who reads every description spends four minutes on each. Nobody does that. In practice a guest reads six lots properly and skims the rest, which is another way of saying that lots twenty-one to forty are largely invisible.

The shape of a good catalogue

Think in three bands rather than one number.

• Two to four headline lots worth €300 or more, sold live. These set the ceiling for the evening and supply the stories people repeat afterwards.
• Six to ten middle lots worth €50 to €250. This band produces most of your total, and it is the band most committees under-build because middle lots are less exciting to collect.
• Three to six accessible lots under €50. These let every guest win something, and a room where a lot of people win is measurably more generous than a room where four people win everything.

That comes to roughly twelve to twenty, and it comes to that on purpose rather than by accident.

Too few is also a problem

The advice to cut is not an argument for a very short list. Below about eight lots the evening starts to depend on two or three individuals, and if the person everybody expected to buy the weekend away happens to be ill that week, the total halves. A short list also means most guests go home having won nothing at all, which flattens the mood and makes the following year’s ticket sales harder.

Eight to twelve is a sensible floor for a room under forty people. Below eight, consider whether an auction is the right instrument at all, or whether a raffle with one strong prize would raise the same money for a fraction of the work.

What too many lots actually looks like

• The catalogue takes ten minutes to read, so most guests never finish it and default to the first page.
• Similar lots cannibalise each other. Three restaurant vouchers split the diners three ways and all three close at the opening bid.
• The close becomes unmanageable. Nobody, guest or volunteer, can track forty countdowns.
• Checkout slows down. More winners means longer queues, more payment chasing and a longer evening for the two people clearing up.

How to cut without offending donors

Cutting donated lots feels ungrateful, which is exactly why committees do not do it. But refusing to cut is not kindness to the donor; a lot that sells for its opening bid serves nobody.

• Bundle. Three small beauty products become one pamper basket. Two €25 vouchers from the same street become a night out. Bundles concentrate bidding and flatter the donors, who share in a larger price than any of them would have reached alone.
• Move small items to a raffle or a fixed-price table. A €15 candle raises more as a €5 raffle line, sold thirty times, than as a lot with one bid on it.
• Hold some back for next year, with the donor’s blessing. Most donors want their gift used well rather than used immediately, and being told so is not an insult.

Adjust for the room and the format

Under forty guests, lean smaller: eight to twelve lots. A small room cannot sustain bidding contests on twenty fronts at once. Above two hundred guests you can stretch to twenty-five or even thirty silent lots, because the attention pool is genuinely deeper, but the live block stays at five or six regardless of room size. That number is set by the clock and by human patience, not by the guest list.

An auction that runs online over several days follows different rules. Attention is not competing with a dinner, a speech and a band, so thirty to forty lots is workable, and bidders return to the list repeatedly. If you are running both, count them separately rather than lumping them into one catalogue. The organiser guide sets out how the two formats differ in practice.

A test for each individual lot

Ask one question: can I name three people who will be in the room and would want this? If yes, keep it. If you can name only one, that lot will close at its opening bid at best, so bundle it or move it to the raffle. If you can name nobody, thank the donor and route the gift elsewhere.

Run the test with two other people rather than alone. The lots a committee argues about are usually the interesting ones, and the lots everybody quietly agrees are fine are usually the ones that raise three hundred euros between twenty of them.

Keeping a note after the evening of what sold, what stalled and what surprised everybody is worth more than any rule of thumb, because by year three you will be pricing and sizing against your own room instead of somebody else’s. The walk-through takes the build in order, pricing does not depend on how many lots you list, and there are notes on typical catalogue sizes for schools and for charities and galas, which sit at opposite ends of this range.