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John Duffner's Business Services, Inc.
(Not a CPA firm)

Your Own GPS....

The following library of financial calculators has been selected to help you begin planning your financial future-from forecasting your retirement options or child's college fund to estate planning and mortgage refinancing. Interactive calculations, dynamic graphs, and fully customizable reports are just a few features provided with our calculators to support thorough financial planning and a sound decision-making process. Though not a substitute for advice and information provided by a qualified professional, the listed calculators offer a good starting point to a secure future.

Mortgage CalculatorUse this calculator to view the total interest and total payment for a mortgage based on the loan amount, years of payments, and annual interest rate you enter.
Time To Payoff Credit CardUse this calculator to calculate the monthly payment and length of time it will take to pay off your credit card.
Years to Become a MillionaireThis calculator computes the number of years it will take for an initial investment along with monthly contributions to accumulate to $1 million.
Children's Education SavingsUse this calculator to evaluate and determine if you need to make changes to your college savings plan.
Investment Needed to Achieve GoalUse this calculator to determine the investment needed to achieve your goal.
Mortgage Refinance BreakevenUse this calculator to determine if you should refinance your mortgage and when you will break even.
Second Income CalculatorUse this calculator to estimate your additional monthly net pay after expenses if your spouse is working.
Auto Loan Payment CalculatorUse this calculator to calculate an auto loan amount based on your desired monthly payment or to calculate a monthly payment based on an auto loan amount.
Loan CalculatorUse this calculator to view the total interest and total payment for a mortgage based on the loan amount, years of payments, and annual interest rate you enter.
Qualify for Home PurchaseThis calculator indicates whether or not you qualify for a conventional mortgage.
Paycheck Calculator - SalariedThis calculator computes net or gross pay for a single paycheck and displays the various withholdings.