Mortgage Refinance Calculator - Savings Analysis

A mortgage refinance calculator compares the remaining cost of an existing home loan with a proposed replacement loan. Enter the current balance, the payment you make now, years left, the new rate and term, and closing costs. The calculator reports the new scheduled payment, the monthly cash-flow difference, the months required for that difference to recover closing costs, and the estimated total savings. It is useful when a lender quotes a lower rate, when a borrower wants to shorten a term, or when a household needs to decide whether a refinance belongs in its budget. The new payment uses the standard fixed-rate amortizing-loan equation: payment = principal × periodic rate ÷ (1 − (1 + periodic rate)^−number of payments). Here the periodic rate is the proposed annual rate divided by 12 and the number of payments is the proposed term in months. Monthly savings equal the current monthly payment minus that calculated payment. Break-even months equal closing costs divided by positive monthly savings. The total-savings estimate compares the remaining scheduled payments on the current loan with payments on the replacement term, then subtracts closing costs. Interpret a positive monthly saving as immediate budget relief, not automatically as a better lifetime deal. Extending the term can lower the payment while increasing the time interest accrues. Conversely, a shorter term can increase the payment while reducing the total interest paid. The current rate is included to help you check the loan scenario against your statement; use the actual current payment and remaining term for the comparison. Closing costs should include lender, title, appraisal, and prepaid charges that you expect to pay rather than finance. Run several realistic scenarios: keep the term unchanged, shorten it, and test a rate that is slightly worse than the quote. Compare the break-even date with how long you expect to own the property, and consider whether cash-out borrowing changes the balance. This estimate assumes fixed payments and no prepayment penalty, taxes, insurance, escrow changes, or rate locks. Verify final disclosures and lender terms before committing to a refinance.