How to set a wedding budget from the guest count
One decision sets most of the cost, and it is not the venue. Nearly sixty percent of a typical budget moves with how many people you invite.
The short answer
Set the guest count first, because it drives catering, drinks, stationery, favours, cake and the size of venue you need. Around sixty percent of a typical wedding budget scales with headcount, so the guest list is the single most powerful lever available and it is usually decided last.
The formula
per-guest cost = catering + drinks + stationery + favour + cake portion
guest-driven total = per-guest cost x guest count
fixed total = venue hire + photography + attire + music + flowers
budget = guest-driven + fixed + contingency
Venue hire sits in the fixed column but the venue you can book is determined by the guest count, so the number moves that line too, just in steps rather than smoothly.
Worked example
A $24,000 budget at 120 guests, with catering at $85 a head, drinks $22, stationery $3, favours $4 and cake $5:
per-guest cost = 85 + 22 + 3 + 4 + 5 = 119
guest-driven = 119 x 120 = 14,280
as a share of budget = 14,280 / 24,000 = 59.5%
at 100 guests = 119 x 100 = 11,900
saving from 20 fewer = 2,380
Twenty fewer guests is $2,380, before any change to the venue. That is more than most couples save by negotiating every supplier they meet.
Write the small costs down before booking anything
Postage, alterations, vendor meals, corkage, parking, the extra hotel night. Individually they are all small enough to approve without thinking, and together they routinely add several hundred to a couple of thousand.
They also arrive late, in the final six weeks, when the big commitments are already made and there is no room left to absorb them. Listing them at the start changes what the venue number is allowed to be, which is the only point at which the decision is still cheap.
Track what is left, not what is spent
Total spent describes the past. Remaining describes the decision you are about to make, which is the one that matters when a supplier asks for an answer this week.
It also changes behaviour in the right direction. Seeing $1,200 remaining before agreeing to a $400 upgrade is a different conversation from seeing $22,800 spent, even though they are the same fact.
Where contingency belongs in a wedding budget
Five to ten percent, held separately and not treated as spendable. Weddings generate late changes reliably: a supplier falls through, the numbers shift, the weather forces a marquee decision.
The couples who come in under budget are usually the ones who budgeted honestly rather than the ones who negotiated hardest. An optimistic $24,000 plan overruns; a realistic $20,000 plan tends not to.
What this leaves out
- Per-head costs vary enormously by country, season and day of the week. The structure is general; the figures are illustrative.
- Excludes rings, honeymoon and pre-wedding events, which are often budgeted separately and often forgotten entirely.
- Assumes a single venue. Separate ceremony and reception locations add transport and a second setup.
Common questions
- What percentage of a wedding budget goes on catering?
- Commonly a third to a half once drinks are included, which is why headcount dominates everything else. Published percentage breakdowns are averages across very different weddings and are worth less than your own per-head figure from two real quotes.
- Should I book the venue first?
- Set the guest count first, then the venue, because the count determines which venues are even possible. Booking a venue and then discovering it seats thirty fewer than your list is an expensive order to do things in.
- How much should we keep back for surprises?
- Five to ten percent, in a separate line you do not allocate. Weddings reliably produce late costs, and a contingency that has been quietly spent on flowers is not a contingency.
Spreadsheets that do this
The formulas above, already built and checked — so you fill in your numbers rather than the arithmetic.
Related guides
Last reviewed 22 August 2026