Making potato salad for a party of 80 requires at least 28 pounds of potatoes, which makes 40 pounds of finished salad. This amount is sufficient for a party with buffet-style service, and it allows for second helpings and extra people.
When making potato salad for 80 guests eating from individual plates, Allrecipes.com recommends providing a 3- to 5-ounce serving per person. For this type of event, 19 pounds of potatoes are needed to make 26 pounds of potato salad, based on one serving per person. However, since food consumption at large parties varies, depending on the type of event and the people attending, it is always best to make extra to cover the possibility of unexpected guests and larger appetites.