How many servings of potato salad is needed to serve 50 people?

As a guide allow 4 ounces of potato salad per person.

4oz x 50 equals 200oz, that's 12.5 pounds of potato salad.

Some folk may take a little more, some folk won't take any as they might not like potato salad.

Therefore 12.5 pounds should be enough for 50 people.