The standard answer of how many potatoes do you need per person is 1/2 a pound uncooked potatoes per person. The recipe we create below uses 2.5lbs and we recommend that serving 4 people. We add a little bit more simply because they are the best dairy free mashed potatoes around and you'll want to have a little more on hand for when you eat a serving of them before they get to your table. Don't worry, secret is safe with us.