In 60 minutes of cycling on a flat level surface, a 200 pound (90.7kg) person will burn: 334 calories at 5.5mph (8.9kph), 650 calories at 10mph (16kph), and 954 calories at 15mph (24.1kph). In the same scenario, a 150 pound person will burn: 250 calories at 5.5mph, 486 calories at 10mph, and 716 calories at 15mph.