United Mileage Plus has added a mileage calculator to its Web site that will quickly calculate how your miles can add up in a year. Enter in the number of flights you have planned, your hotel stays, car rentals and other partner activities and the calculator will display an estimate of your potential mileage earning, based on average offers. It’s not exact, but it’s a fun way to see how your various activities can add to your mileage balance. Visit http://insideflyerus.wpengine.com/link/?3679 to check it out.