In 30 minutes of running on a flat level surface, a 200 pound (90.7kg) person will burn: 239 calories at 4mph (6.4kph), 396 calories at 5mph (8kph), 468 calories at 6mph (9.7kph), and 525 calories at 7mph (11.3kph). In the same scenario, a 150 pound (68kg) person will burn: 179 calories at 4mph (6.4kph), 297 calories at 5mph (8kph), 351 calories at 6mph (9.7kph), and 394 calories at 7mph (11.3kph).