How many pounds of potatoes for scalloped potates for 125 people?

For scalloped potatoes, a general guideline is to plan for about 1/3 to 1/2 pound of potatoes per person. For 125 people, this translates to approximately 42 to 63 pounds of potatoes. Adjustments can be made based on the portion size and whether the dish is a main or side dish. It's always a good idea to round up to ensure everyone is satisfied.