Your caterer wants a final head count on a date that arrives before your guests have finished replying. The way through it is not to guess. Take the replies you already have, work out what share of the people who answered said yes, and apply that same share to the people who have not answered yet. That gives you a projected final head count - an estimate built from reply behaviour, and useful only if you treat it as an estimate.
Why the deadline lands before the answers do
A kitchen orders food, a venue rosters staff, and a hire company loads chairs onto a van. All three need a number, and all three need it while your guest list is still moving. Your contract will name the day. It might well be a Tuesday, chosen because it suits a supplier’s ordering week rather than your guests.
Guests, meanwhile, reply in two waves. There are the people who answer the moment they open the invitation, and then there is everybody else: the cousin waiting on a shift roster, the friend who has not booked flights, the couple who want to know whether the other couple is going. None of it is rudeness. It just means that on the day you owe a number, a real part of your list is still silent. The projection exists to give you something better than a shrug on that day.
How the projection is worked out
The arithmetic is simple enough to check by hand, which is the point. Look at everyone who has given you a definite answer, yes or no. Work out what proportion of those people accepted. Apply that same proportion to the heads still awaiting a reply, and add the result to the number already confirmed. That total is the projection.
Two details matter for accuracy. It counts heads rather than households, so a family of four who confirm two are counted as two, not four. And it uses what guests actually confirmed, not what they were allowed to bring, which is why a projection usually sits below the total number of people invited.
What to do with the number
A projection is a planning figure. It is most useful in the weeks before the contractual deadline, when you are deciding whether to worry. Here is how to hold it:
- Round up, never down, for anything people eat or drink. Running short is worse than a little waste.
- Round carefully for anything charged per head that cannot be consumed - chairs, printed menus, favours. There the buffer costs you and buys nothing.
- Ask your caterer two questions in writing: the exact date the final number is due, and how far it can move after that date.
- Watch your venue minimum. If the projection is drifting under it, you are paying for empty seats, and you would rather know that now than the week before.
Give suppliers the projection as a working figure early, and give them the counted number on the contract date. If your projection sits near the edge of a pricing band, ring the caterer before you commit to either side of it.
On a multi-day wedding, every day has its own number
A caterer cooks for a day, not for a wedding. Your aunt says yes to the wedding and no to the homecoming. Your colleagues are invited to the reception only. A family of four holds one seat at the small family lunch and four at the main event. One number across the whole wedding overstates every individual day, sometimes badly.
Where the invitation carries more than one ceremony and per-ceremony replies are switched on, each day is projected from its own answers, using the same rule: confirmed at that ceremony, plus the awaiting seats at that ceremony, at the accept rate people have shown for that ceremony.
Both of those conditions are worth being plain about. Per-ceremony replies are an opt-in setting, off unless you turn it on, and without it one answer covers the whole invitation - which leaves you a single combined number rather than a number per day. Turn it on before you send, not after: a reply given before the switch carries no per-ceremony detail in it, so those guests go back to owing you an answer for each day. You can read how the reply side of that works on the RSVP page.
The guests who will never touch the link
Every list has some. The aunt who telephones your mother instead of replying. The uncle who says yes across a table at a family lunch and considers the matter closed. The great-uncle whose handset has buttons on it and nothing to open a link with.
These are not a technology problem, and no reply system solves them. The fix is old-fashioned: telephone them, ask, and then record the answer yourself against their name so the count includes it. An answer that lives only in somebody’s memory of a phone call is invisible to the count. Split the chasing rather than doing it in one evening - one parent takes their side of the family, you take your friends, and whoever is closest to a guest is the one who rings.
When the projection is not the right tool
Two situations are better served without it. A guest list you could recite from memory does not need arithmetic behind it. Spend an evening on the phone instead and you will hold a counted number before any estimate has had time to settle, which is what the caterer wanted in the first place. And in the first days after you send, with a handful of answers in, the figure on screen is arithmetic resting on almost no evidence. Leave it be until a week of replies has gone by.
There are also weddings where the guest list is not a fixed set of people. If your culture treats the invitation as open, and people arrive who were never on a list, no projection built from your guest list can describe the room. It can only tell you about the people you invited. In that case, the number to give the caterer comes from the family members who have watched this happen before, and the projection is a floor to build on rather than an answer.
Frequently asked questions
When do caterers need the final head count?
Your contract names the date, and that is the only date that counts. Ask for it in writing, ask whether it is working days or calendar days, and put it in your planning list the moment you book. Do not work from what a friend was asked for at a different venue.
What if more people accept after I have given the final number?
Ask before you need to, not after. Some caterers will absorb a late addition or two, and some will charge for it or refuse. That flexibility is theirs to offer rather than yours to assume, so find out where you stand while there is still time to plan around the answer.
Do children and suppliers count towards the number?
Usually they are counted separately, and often charged differently. Photographers, the band and the coordinator generally eat a supplier meal rather than a guest meal, and children may sit in their own price band. Ask your caterer how they want each group counted before you total anything up.
Related: RSVPs and replies