Set one comparable decision contract
Record these assumptions before calculating
- Menu, portion, guest and dietary-assumption version. (not complete)
- Service format, venue, access and run-sheet duration. (not complete)
- Per-guest recipe, packaging and service costs. (not complete)
- Event-level planning, setup, travel, equipment and minimum labour. (not complete)
- Capacity displaced by the event and cancellation/change boundary. (not complete)
event contribution = guest revenue + extra revenue - guest-variable cost - event-fixed cost
- guest-variable cost
- Food, beverage, disposables and service resources that change with served guests (CU per guest or event) — recipe, supplier and roster record
- event-fixed cost
- Planning, setup, transport, venue-specific and minimum staffing cost committed once (CU per event) — quote, roster and run sheet
- event contribution
- Amount remaining before costs deliberately outside the event boundary (CU per event) — derived
Keep one currency, indirect-tax basis, time horizon and cost boundary throughout. Scenario values below are invented currency units (CU), not benchmarks.
Worked example: Catering Economics: Price, Guests and Capacity
Invented tax-exclusive event: 80 guests at 55 CU; 22 CU variable cost per guest; 1,350 CU event-fixed cost and 200 CU extras revenue.
| Line | Calculation | Result |
|---|---|---|
| Guest revenue | 80 × 55 | 4,400 CU |
| Total revenue | 4,400 + 200 | 4,600 CU |
| Included cost | 80 × 22 + 1,350 | (3,110 CU) |
| Event contribution | 4,600 - 3,110 | 1,490 CU |
| Case | Changed input | Decision result |
|---|---|---|
| 60 guests | 60 × (55 - 22) + 200 - 1,350 | 830 CU |
| 80 guests | 80 × (55 - 22) + 200 - 1,350 | 1,490 CU |
| 100 guests | 100 × (55 - 22) + 200 - 1,350 | 2,150 CU |
Keep the guest-count corridor inside both boundaries
| Boundary | Declared inputs | Scenario result | Decision check |
|---|---|---|---|
| Lower fixed-cost recovery threshold | 1,350 CU event-fixed cost; 55 CU price; 22 CU variable cost; 200 CU extras | 35 guests after rounding up: (1,350 - 200) ÷ (55 - 22) | Below this count, the entered contribution does not recover the event-fixed boundary |
| Quoted 80-guest case | 80 guests on the same menu, service and tax basis | 1,490 CU event contribution | Check that staffing, equipment and venue capacity still fit |
| Upper service-capacity boundary | User-recorded maximum for this menu, venue, run sheet and service format | Enter supported guests per event | A quote is not viable when the required or accepted count exceeds supported capacity |
Use the exact calculation owner
- Catering Event Profitability Planner
Test catering event profit after food, staffing, logistics, waste and venue constraints
Turn the calculation into an operating decision
- Freeze menu, format, venue and service boundary.
- Cost one served guest from current recipes and supplies.
- Build event-fixed cost from the run sheet.
- Calculate contribution at realistic guest counts.
- Check staffing, equipment and venue capacity steps.
- Translate the accepted case into a quote and review actuals after service.
- Applying one food-cost percentage instead of costing the menu.
- Treating all labour as per-head or all labour as fixed.
- Ignoring setup, cleanup, travel and access time.
- Using booked guests and served guests interchangeably.
- Changing guest count without checking capacity steps.
Questions to settle before acting
- Should price per head include event-fixed cost?
- It may, but show the recovery explicitly. A separate minimum spend can make the fixed commitment clearer when guest count changes.
- What if the final guest count is uncertain?
- State a commitment date and compare low, contracted and high counts under the proposed terms; obtain local contract advice.
- Does the example include tax?
- No. It is an invented tax-exclusive scenario. Apply the correct local indirect-tax presentation separately.
Sources and methodology
- Catering Economics: Price, Guests and Capacity: calculation boundary — Margin101: Formula, unit, assumption and limitation reference for the primary decision handoff.
- Food safety and eating out — U.S. Food and Drug Administration: Illustrates that safe-service obligations sit outside the economics model; local requirements control.