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Your weight and the distance you walk determine the energy calories burned while walking. Walking speed matters less than distance and weight. A rule of thumb is 100 calories per mile for a 180-pound person. If you can achieve the speed of walking a mile in 13 minutes or less, you will burn more calories per mile. But for most beginning walkers, it is best to increase the distance before working on speed.  

To lose weight, you need to increase your activity to burn more calories and/or eat fewer calories each day. Start with knowing how many calories your body burns per day just in maintaining your current weight.

A pound of fat equals 3500 calories. To lose 1 pound a week you will need to burn 3500 more calories than you eat that week. Losing one pound of fat a week is a sensible goal, but it requires a reduction of 500 calories per day. You can do this by increasing your calorie-burning activity or by eating fewer calories -- or both. It is easier to achieve it with the combination of increased activity and eating less. Exercising enough each day to burn 300 to 400 calories is a good goal for the exercise portion of your weight loss plan.

See the walking calories chart at the bottom of this page. You might burn more calories per mile at very low speeds because you are basically stopping and starting with each step and your momentum isn't helping to carry you along. Meanwhile, at very high walking speeds you are using more muscle groups with arm motion and with a racewalking stride. Those extra muscles burn up extra calories with each step. Running can burn more calories per mile as there is an up and down motion lifting your weight off the ground as well as moving it forward.

The chart of calories burned per mile is based on MET research - metabolic equivalents of various activities.