What cost per guest actually tells you
Cost per guest is the total budget divided by the guest count, and on its own it is close to useless. A £20,000 wedding for 100 guests is £200 a head, but that figure includes the photographer, the dress and the band — none of which change if ten more people come.
The number worth calculating is the marginal cost per guest: what one more guest costs you. That is the figure that answers the only question people actually ask cost per guest for, which is whether to invite someone.
Two numbers, not one
| Measure | How to work it out | At £20,000 and 100 guests | What it answers |
|---|---|---|---|
| Average cost per guest | Total ÷ guests | £200 | Whether the wedding as a whole is affordable |
| Marginal cost per guest | Per-head catering + drinks + stationery + place setting | £100–£130 | Whether one more invitation is affordable |
The gap between those two is the fixed cost of the wedding, and it is usually about half the budget. Photography, videography, attire, beauty, music and the celebrant do not move with the guest list at all. Venue hire, flowers, transport and contingency move partly. Only catering, drinks, stationery and favours move fully.
Marginal cost by budget
| Total budget | Guests | Average per guest | Food and drink per guest (48%) | Roughly what one more guest costs |
|---|---|---|---|---|
| £15,000 | 50 | £300 | £144 | £106 |
| £20,000 | 100 | £200 | £96 | £71 |
| £30,000 | 100 | £300 | £144 | £106 |
| £30,000 | 150 | £200 | £96 | £71 |
| £40,000 | 150 | £267 | £128 | £94 |
The last column takes about 60% of each guest's share of food and drink (the part that is actually per head rather than venue hire and minimum spend), their full share of stationery, and about 40% of their share of flowers and decor. It is deliberately not the headline figure, because the headline figure will talk you out of invitations that cost half what you think.
When cost per guest is the wrong tool
If your budget is over, cutting guests is the slowest way to fix it. Removing ten guests from a hundred saves roughly 4% of a typical budget. Moving the date to a Friday, changing the season, dropping videography or renegotiating a single supplier quote each save more, faster, and without a conversation you cannot take back.
Cut the guest list when the room is too small or the day is too crowded to enjoy. Cut suppliers and scope when the money is the problem. Those are different decisions and cost per guest quietly blurs them.
Test it against your own budget
The calculator gives you the average; this page gives you the number that decides invitations.
Common questions
What is a normal wedding cost per guest?
Divide your total by your guest count — a £20,000 wedding for 100 is £200 a head. But that includes fixed costs like photography and attire, so it is not what an extra guest costs. The marginal figure is usually £100–£130 at that budget.
How much does one extra wedding guest cost?
Roughly their share of catering and drinks, plus stationery and part of the decor — commonly half to two-thirds of the average cost per guest. At £20,000 and 100 guests that is about £110, not £200.
Is cutting the guest list a good way to save money?
It is the slowest way. Ten guests off a hundred saves about 4% of a typical budget. Changing the day of the week, the season, or one supplier's scope each save more and faster.
What percentage of the budget is fixed?
Usually around half. Photography, videography, attire, beauty, music and the celebrant do not move with guest count at all, and venue hire, flowers and transport only move partly.
Should you use cost per guest to compare venues?
Only if you compare the same scope. A venue quoting £90 a head including service, a three-course meal and half a bottle of wine is cheaper than one quoting £75 excluding all three. Get both onto the same list of inclusions first.