This tool tells you how long it takes for the monthly savings from refinancing your mortgage to repay the upfront cost of doing so. That point in time is called the break-even, and it is the single most useful number for deciding whether a refinance is worth it. If you plan to keep the home well past the break-even, refinancing may pay off; if you might move sooner, it may not.
The math is a simple ratio. Break-even months equals total refinance closing costs divided by the monthly payment savings. Monthly payment savings is your current monthly payment minus your new monthly payment after refinancing. Once you have that, you compare the break-even number of months against how long you realistically expect to stay in the home. Staying longer than the break-even means the accumulated savings exceed the cost.
Suppose refinancing would cost $6,000 in total closing costs, and your monthly payment would drop from $1,700 to $1,500, a savings of $200 a month. Break-even months equals $6,000 divided by $200, which is 30 months, or two and a half years. If you expect to stay in the home for at least five more years, you would clear the break-even and then keep saving $200 a month afterward. If you thought you might sell in two years, you would not recover the cost, so refinancing would likely not make sense.
Enter your total refinance closing costs, your current monthly payment, and your estimated new monthly payment under the terms you are considering. The calculator computes the monthly savings, divides the costs by that figure, and reports the break-even in months along with a plain comparison to a stay horizon you provide.
This simple break-even looks only at monthly payment savings and does not account for a longer or shorter loan term, which changes total interest paid over the full loan. Restarting a 30 year clock can lower your payment while increasing lifetime interest. The tool also ignores the time value of money and any cash-out amount. Rolling closing costs into the new loan balance changes the picture as well. Treat the result as a first screen, not the final word.
What goes into closing costs? Typical items include loan origination or points, appraisal, title services, and recording fees. Ask your lender for a full estimate before running the numbers.
Does a lower payment always mean savings? Not necessarily. A lower payment achieved by extending the term can raise total interest over the life of the loan even while the monthly figure falls.
Should I include a rate-and-term versus cash-out difference? This simple version focuses on payment savings. A cash-out refinance adds borrowed money to the balance, so weigh the purpose of that cash separately.
What if I roll costs into the loan? Then you pay no cash upfront but carry a larger balance and pay interest on the costs. The break-even logic still applies to the net monthly savings.
Disclaimer: This calculator provides educational estimates using standard formulas, not personalized financial advice. Lending terms, interest rates, and your individual circumstances vary. Consult a licensed mortgage, financial, or tax professional before making decisions.
Sources: Freddie Mac. Primary Mortgage Market Survey (weekly mortgage rates)