From your phone bill enter the number of minutes of a call and the corresponding cost of the call in the first two entry fields respectively. Next, either click the "Enter" button or press the "Tab" key on your keyboard. To get the average cost per minute for more than one call, simply repeat the preceeding instructions for each call and the calculator will accumulate the totals. In any case, be sure to record your average cost per minute. Then, the next time you make a long distance call, open this calculator, enter your average cost per minute in the corresponding field and click "Start Timer" once the long-distance connection is made. Finally, click "Stop Timer" just as you hang up. You can then record your call to keep an estimated running total of your monthly long-distance calls. Note that you can save this page to your hard drive and open the calculator in your web browser without being connected to the internet (for those who only have one phone line).