It may seem like the only equation you need for figuring out how much pie to have for Thanksgiving is pie + more pie = enough pie. After all, extra pie is the easiest way to ensure there's enough for a slice the next morning. We're with you — next-day pie for breakfast is always a good idea.
Nevertheless, planning takes priority in some situations, so it's also a good idea to know how many pies to have on hand.
Let's be real here — running out of mashed potatoes is one thing, but if you run out of pie, our only advice for you is to cut very small slices and ask for forgiveness.