Quick guide
How to use this calculator
- Enter values from one real situation and keep currencies, quantities, and periods consistent.
- Use the optional fields only when they apply; the calculator will keep every entered adjustment visible in the result.
- Compare the component outputs and read the calculator-specific boundary before making a purchase or plan.
Calculation method
Calculation method
Required menu quantity = sum(group guests × entered portions per person) × (1 + reserve); packages = ceiling(required ÷ package yield).
Entered fixed decimals use exact rational arithmetic wherever the task involves money, ratios, or allocations. Whole packages, tables, seats, and items round only where the real task requires indivisible units.
Worked example
Worked example
Eighty standard guests at 1.2 portions plus 20 children at 0.7 portions require 110 portions before reserve.
Required menu quantity = sum(group guests × entered portions per person) × (1 + reserve); packages = ceiling(required ÷ package yield).
Supported inputs
Precision and limits
Your scenario
No live price, promotion, retailer policy, tax, cultural norm, household consumption rate, attendance rate, or media speed is supplied automatically.
Plan, not a guarantee
Results organize visitor-entered assumptions. They do not guarantee availability, attendance, product life, savings, suitability, or contractual rights.
Precision and privacy
Inputs stay in this browser. Invalid denominators, contradictory counts, impossible percentages, and unsupported ranges return explicit messages rather than misleading results.
Calculator-specific boundary
Portions, dietary groups and package yields must come from the actual menu and caterer. This does not assess nutrition, allergens, food safety or suitability.
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