Fitness Walking with Vivofit
I use the Garmin Vivofit with the optional heart rate monitor to track the number of steps taken each day. In addition to counting steps, the device monitors the distance covered, average calories burned, tracking my actual steps taken versus my daily goal, heart rate, a sleep monitor as well as showing the time. The Vivofit also makes exercise enjoyable by having weekly contests with other people and tracking your activity over time.
As a general rule, a person will burn about 100 calories walking a mile, depending on age, size, and fitness level. The heavier you are, the more calories you will burn.