How much parmesan cheese do you need at a spaghetti feed?

For a spaghetti feed, you typically need about 1 ounce (28 grams) of grated Parmesan cheese per person. If you're serving a crowd, estimate around 1 pound (16 ounces) for every 16 guests, which allows for generous servings. Adjust based on your guests' preferences and whether other cheeses will be offered as well. Always good to have a little extra on hand!