You will burn calories doing just about anything other than sitting behind a computer and moving faster than a sloth.....No website persay to tell you how many calories exactly but how long you ride and how fast or slow you pedal will certainly be a factor! How much weight do you want to loose? figure that one out and put as much effort into your pedaling and stick with it and you will see results....do nothing and you will still get results, NEGATIVE results. The type of bike does not matter here....YOU do!
