How many pounds of macaroni for 100 people?

For serving macaroni as a side dish, a general guideline is to allocate about 2 ounces of dry macaroni per person. For 100 people, you would need approximately 12.5 pounds of dry macaroni (since there are 16 ounces in a pound). If macaroni is the main dish, you might want to increase that to around 4 ounces per person, resulting in about 25 pounds for 100 people. Adjustments may also be needed based on the specific meal context and accompanying dishes.