According to the American Heart Association (AMA), with an average weight of either 150lbs or 200lbs, adults can expect to burn the following calories with the following exercises:
Walking at 3mph: 320 – 416 calories/hour
Running at 5.5mph: 660 – 962 calories/hour
Cycling at 12mph: 410 – 534 calories/hour
Swimming at 25yds/min: 275 – 358 calories/hour