Party food calculator
Use this as a shopping starting point, then adjust for the menu and the people you know.
How the portions are counted
The estimate counts a child as 60% of an adult food portion, adds a small dessert buffer, and adjusts appetizer quantities for the length and style of the party.
Adjust for the menu, serving style, and what this group usually eats.
Plan from the guest count
Send the invitation, then revise the shopping list when replies arrive.