Planning a wedding or large event budget
6 min read · Updated 2026-10-12 · MoneyCalc
A large event is one of the worst-run projects most people ever attempt: a fixed date, a budget that feels flexible until it does not, and dozens of suppliers pricing against each other with nobody in the room able to check. The categories add up predictably, and the per-guest figure is what turns a total into something you can actually control.
The categories, and which ones scale
Catering, venue, photography and attire, plus a long tail of florals, stationery, transport, entertainment, hair and make-up and contingency. The categories themselves are predictable; the surprise is in the tail, and the contingency exists because the tail always appears.
Some costs scale with guest numbers and some do not. Venue hire, photography and entertainment are largely fixed regardless of whether forty or a hundred people attend, so adding guests raises the cost far less than intuition suggests. Catering is almost entirely variable, which is where guest count bites.
Per guest is the figure that disciplines the plan
Divide the total by the guest count and you get the number that actually constrains decisions — whether a particular venue is affordable, whether a menu upgrade is possible, whether the evening reception is realistic.
It also makes the trade-offs explicit. Reducing the guest list by ten people saves ten meals and a proportionally larger share of variable costs, which is a bigger lever than any single supplier negotiation.
Where the contingency belongs
Five to ten per cent of the total, set aside from the start and not allocated to anything. Events run over on the tail categories — extra hours, extra guests, a supplier needing something that was assumed to be included.
A contingency assigned in advance survives. One calculated at the end is already spent, because by then it has been implicitly distributed across the other line items.
Deposits, contracts and the payment schedule
Most suppliers take a deposit to book, and the balance is due close to the date. The payment schedule is where the budget becomes real, and it is worth setting out in the calendar at the start rather than discovering the shape of it later.
Check what happens if the event is cancelled or moved, what is genuinely non-refundable, and what the final balance is capped at. A contract with an uncapped balance is a larger risk than its deposit suggests.
Run your own numbers
Free calculators that answer the “how much” version of this question. They run entirely in your browser — nothing you type is uploaded or stored.
Common questions
How much should a wedding budget be?
It depends entirely on the area and the guest count. Work out a per-guest figure first, then multiply, since that constrains the plan far better than a headline total.
How much contingency should I plan for?
Five to ten per cent, set aside from the start and not allocated to any category. A contingency calculated at the end has already been spent.
Which costs do not scale with guest numbers?
Venue hire, photography, entertainment and often staffing are largely fixed. Catering scales almost entirely with guests, so the guest count matters most there.
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