Estimate the net budget required per attendee for a fundraising gala. Fixed costs, guest-level costs, contingency, and committed non-guest income are combined so the per-person figure reflects the amount that still needs to be funded through tickets, registrations, donations, department budget, or other guest-linked support.
Net cost per guest = [(fixed costs + variable cost × guests) × (1 + contingency) − sponsor income − other income] ÷ guests
This is the remaining cost burden per expected attendee after non-guest income. Compare it with ticket price, registration fee, donation target, or internal event budget.
Budget note: exclude uncommitted sponsorship or donations from the base case and run a separate upside scenario.
Using $45,000 in fixed costs, $95 per guest, 300 guests, $20,000 in sponsor income, $5,000 other income, and 10% contingency gives a net cost of $186.17 per guest.
Use expected attendance for the base budget, then run a high-attendance scenario to test capacity and variable costs.
Enter committed sponsorship under sponsor or grant income so it reduces the net cost allocated per guest.
Yes. The calculator applies contingency to operating costs, then subtracts sponsor and other non-guest income.
It means entered non-guest income exceeds projected costs, creating a projected surplus before guest-linked revenue.
Include unavoidable per-attendee fees in variable cost unless they are charged separately and retained outside the event budget.
| Variable | Treatment |
|---|---|
| Fixed costs | Do not change with attendance |
| Variable cost | Multiplied by expected guests |
| Contingency | Applied to total operating cost |
| Non-guest income | Offsets the amount funded per guest |