This calculator will help you decide whether or not it would be advantageous to refinance either a single mortgage, or consolidate a first and second mortgage into a single mortgage. Not only will this calculator calculate the monthly payment and net interest savings (if applicable), but it will also calculate how many months it will take to break even on the closing costs (if applicable).
Note: Be sure to only include the principal and interest portion of your monthly mortgage payment, i.e., do not include any escrow portions property taxes, insurance, etc.).