The mortgage payoff calculator helps you find out. Use this free Illinois mortgage calculator to estimate your monthly mortgage payments and annual amortization.Use SmartAsset's free mortgage calculator to estimate your monthly mortgage payments, including PMI, homeowners insurance, taxes, interest and more. Use this calculator to see what it will take to pay off your credit card balance, and what you can change to meet your repayment goals. Mortgage Acceleration. This calculator can help you determine how soon you can pay off your mortgage. This mortgage payoff calculator helps evaluate how adding extra payments or bi-weekly payments can save on interest and shorten mortgage term. Can I Pay My Mortgage Using a Credit Card? Our online calculators provide quick and easy access to mortgage calculators and information for the public interest. Take control of your finances.