On a flat level surface, a 200 pound person will burn 1000 calories cycling at: 5.5mph (8.9kph) for 180 minutes, 10mph (16kph) for 93 minutes, and 15mph (24.1kph) for 63 minutes. In the same scenario, a 150 pound person will burn 1000 calories cycling at: 5.5mph for 240 minutes, 10mph for 124 minutes, and 15mph for 84 minutes.