Question: how many calories are in 1 gram of uranium?
Answer: Uranium contains about 18 million kCal/gram (those are food Calories; capital C), or about 18 billion calories/gram (those are heat calories). One pound of fat is about 3500 kCal or about 3500000 cal, so 1 gram of Uranium would result in about 5,000 pounds worth of fat when comparing energy to energy.