Catering Portion Quantity Calculator
Estimate whole catering portions and prepared food kilograms from guests, serves, portion size and contingency.
Your results
Calculation breakdown
- Whole portions
- ceil(guests × serves per guest × (1 + contingency))
Worked example
For 120 guests at 1.2 serves each plus 10%, prepare 159 whole 180 g portions, representing about 28.62 kg of food.
Assumptions
- Every portion uses the same prepared mass.
- Contingency is applied to expected portions before whole-number rounding.
Sources
Rates effective 23 August 2026.
How this calculator works
Estimate whole catering portions and total prepared food mass from guest count, serves per guest, portion size and contingency. The output separates expected consumption from the whole portions actually provisioned after allowance. Inputs and intermediate values stay visible so an Australian club, venue or food team can reproduce the estimate and replace assumptions with measured operating data.
Frequently asked questions
Which inputs matter most for the catering portion quantity result?
Use an event-specific attendance forecast, service style, menu role and measured portion standard rather than a generic guest allowance. Keep the measurement period and definitions consistent when comparing results.
What is not captured by this catering portion quantity calculation?
Guest mix, service duration, menu variety, dietary needs, self-service behaviour and leftovers can change actual consumption. Treat the output as one planning measure rather than a complete operating decision.
When should the catering portion quantity estimate be recalculated?
Recalculate when quantities, participants, rules, equipment, packaging or operating conditions change. For this topic, use an event-specific attendance forecast, service style, menu role and measured portion standard rather than a generic guest allowance.