Okay, you will burn, roughly, 100 calories a mile. There are approximately 3,500 calories in 1 pound of body fat. So you will have to have a calorie deficiency of 500 calories per day to lose 1 pound each week. You can do this by several ways: 1. Run 3 miles and cut out 200 calories in your diet daily for 7 days a week. 2. Run 5 miles a day / 7 days a week. 3. Run 2 miles a day and cut out 300 calories from your daily diet each week You get the idea. As long as you have a 500 calorie deficiency per day, you will lose 1 pound each week.
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It doesn't really work that way. The only thing you can lose fast is fluids, by sweating. Pushing hard, on a warm day you can shed one pound in maybe one hour - which you'll promptly put back on when you reach for your water bottle.
By sticking to a sensible diet, you could lose one pound in 2-3 days, pretty much independent of exercising or not.
Let's say running is about 600 cals/hour, and the general guideline is that 3500 calories burned equals one pound. So in theory, about 6 hours of running would lose you one pound. If you run at 4 MPH, that'd put you at 24 miles.
But in reality, it's not as simple as that.
The math above will only work if your eating is pretty much spot on to start with.
Let's say you're overeating with 1000 cals/day.
That's easy enough, it's only about two cupcake's worth of calories.
Now you'd need almost 2 hours of running, or 8 miles, just to get back to square one for that
day. To create any weight loss, you'd have to keep running.
So, assuming you manage to get your eating(your calorie allowance) right to start with, running one hour/4 miles daily would give you a good chance of losing one pound in 6 days.
That depends on how much you weigh. For people that are in the overweight category or heavier, they will burn calories faster than those who are in the healthy weight department.
if you want to lose a pound by running sometimes it helps if you run 10-20 miles (alot, huh?) but if you really want to lose a pound you should work out or like lifting weights.