According to Jim Jarmush’s “Mystery Train”, if he was on Jupiter at the time of his death, Elvis would have weighed 648 pounds.
According to WikiAnswers.com, Elvis weighed 350 on his last tour. This means that, according to the Exploratorium site, Elvis would have weighed 827.4 pounds.
However, his death certificate lists him at an unlikely 170 pounds, making him 401.8 pounds on Jupiter. Other sources list his weight at death as 250 pounds, making him 591 pounds.