A pound is equal to 3,500 calories so if you have some sort or step tracker they usually tell you how many calories you burned and you can go off of that.
It all depends on ur metabolism, and how long each jog is. 3 pounds is a decent amount to plan for it normally takes me a few weeks to lose a pound and i jog everyday. You should ask your physician, she/he should know more about you and your body, they can also help you with a plan for exercise
