Depending on the length of the stride, it takes between 2,000 and 3,000 steps to burn 100 calories. The number of calories burned also depends on speed and weight. Heavier people will burn more calories than lighter people.
According to the September 2009 publication of the Harvard Health Letter, walking 10,000 steps per day is a healthy goal to attain. Walking this many steps can result in burning up to 3,500 calories per week, which equates to one pound.
The best way to reach the 10,000 steps per day goal is to use a pedometer or similar device that automatically counts steps. This will ensure that every step taken counts. Steps can also be estimated based on distance walked. Walking one mile is roughly equivalent to 2,000 steps.