You can calculate telephone charges using this calculator that is also a stopwatch. First, enter the initial values of amount added to every call and amount per minute. Then, when you make a toll call, just click the start button once a connection to your party is made and click on the stop button when the call ends. The calculator will give you the amount, roughly, that will appear on your telephone bill for that particular call. Clicking the stop and start buttons during the call will suspend and then restart the timer without erasing the time/cost at each point. Clicking "Clear Min/Sec" will refresh the page which also resets the values of minutes passed and current seconds to zero.
Calculate Telephone Charges