Financial Calculators and Tools Click the button to open a new window with the calculator that you wish to use. A simple calculator Calculate the future value of your investments with periodic contributions. Calculate your Total Debt Service Ratio (TDS). Banks use this ratio to find out if you can afford new credit. Calculate the monthly payment of a loan/mortgage and the total interest cost. Calculate if refinancing a loan makes sense and how much you will save. Calculate the monthly payment of a leased vehicle. Calculate the monthly payment of a financed vehicle. Calculate the time difference (minutes/hours/days etc) between two dates Calculate when you can become debt free Calculate how much gas a certain trip will cost you