According to Gregory Paul in his 1988 book Predatory Dinosaurs of the World, Tyrannosaurus needed an average of 93 kilos of meat per day (assuming an 8-ton animal). read more
Tyrannosaurus rex weighed about as much as an elephant, and best estimates suggest it needed to consume around 40,000 calories per day. Given that an 80-kg human contains about 110,000 calories of energy, T-Rex would probably need to eat about half of an adult—or one ten-year old child!—every day. Or about 80 McDonald's hamburgers. read more