Sweet Potato=?cups?!
Answers: About how many cups (mashed) will 7 sweet potatoes make? They're about average sized potatoes.
Given that they are average sweet potatoes, you should get between 4-6 cups of mashed potatoes. To make them taste really good, I put in a little butter, brown sugar, apricot brandy, cinnamon and nutmeg.
If you have a big measuring bowl, you can put the potatoes in it, and cover them with water. You can dice them first if it makes them fit. Then measure how much volume the potatoes+water is. Then take out the potatoes and see how far the volume dropped. That will be your answer.