The Sunlite Mortgage Mortgage Calculator calculates the maximum mortgage you qualify for based on your income, down payment and current monthly obligations. Use our refinance interest mortgage calculator to determine how much interest you can save by refinancing your existing mortgage. Our Flexible TDSR calculator allows you to adjust the GDSR and the TDSR based on your credit score to see how much you would qualify for with your lender, and our debt consolidation mortgage calculator is designed to show you how much you can save in interest payments and monthly payments by exercising a debt consolidation strategy.