[James_Henry]

His math is correct. Also, it's really easy math to verify. It's not surprising either. With the stated yields, you could feed a person. You'd need more for a family.

Of course, the yields could probably be improved in order to get the 140 or so lbs needed to feed a family of 3

[commiefornian]

The math is correct but the calorie count per pound potato is way off. It is 350 kcal not 350 cal.

[1propionyl]

In the US, 1 Calorie = 1 kcal elsewhere.

We refer to kilocalories with capital-C "Calorie". I don't know why.

[Groxx]

Probably because lower-c calories are meaninglessly small for like 99% of the population. It'd be like doing all your cooking in milligrams.