On average you burn around 400 calories by walking 10,000 steps briskly (3-5mph – depending on weight and age). Also bearing in mind the average person has a stride length of approximately 2.1 to 2.5 feet meaning it takes over 2,000 steps to walk one mile. Therefore every mile you walk you are burning over 80 calories. Or every 100 steps you burn 4 calories so start stepping!!