Mortgage Refinance Break-Even Calculator
Find out how many months it takes for a mortgage refinance to pay for itself. Compare your current loan against a new rate, factor in closing costs, and see true lifetime savings.
What Is a Refinance Break-Even Point?
The refinance break-even point is the number of months you must stay in your home after refinancing for the accumulated monthly payment savings to equal the closing costs you paid at refi. If you sell or refinance again before the break-even month, you lose money on the deal. If you stay past it, every additional month of lower payments is pure savings. The break-even formula is simple: closing costs divided by monthly payment reduction equals the number of months to recoup.
A classic rule of thumb says refinancing is worth it if the new rate is at least 0.5 to 1 percentage point below your current rate and you plan to stay in the home for 3 to 5 more years. This calculator lets you test any combination of balance, rate, term, and closing costs against that rule.
How the Calculation Works
Two monthly payments are computed using the standard amortization formula. Payment = Balance times (r times (1 + r)^n) divided by ((1 + r)^n - 1), where r is the monthly rate and n is the number of payments. The difference between current and new monthly payment is your monthly savings. Divide closing costs by monthly savings to get break-even months. The calculator also shows total lifetime interest on both loans so you can spot the trap of resetting a 27-year loan back to 30 years — even at a lower rate, a longer term can cost more in total interest despite lower monthly payments.
Real-world tip: if your rate drop is small but closing costs are high, consider a no-cost refinance where the lender pays closing costs in exchange for a slightly higher rate. The break-even is instant but lifetime savings are smaller.
When Refinancing Makes Sense
Refinancing is most profitable when your new rate is at least 0.75 to 1 percent lower, you plan to stay at least 3 years, and you can avoid extending the term dramatically. Other good reasons: eliminating private mortgage insurance once you hit 20 percent equity, converting an adjustable-rate mortgage to a fixed rate before it resets, or consolidating a HELOC into a single fixed-rate first mortgage. Avoid refinancing if you plan to move within 18 months, if your credit score has dropped since the original loan, or if closing costs exceed 5 percent of the balance.
Always shop at least 3 lenders and get Loan Estimates on the same day so the rates are comparable. Lender fees vary widely, and Origination Charge is the most negotiable line item. Last updated April 2026.
For total dollar savings (not just break-even months), see our mortgage refinance savings calculator. To accelerate the existing mortgage instead of refinancing, the early payoff calculator models extra-payment scenarios.
Frequently Asked Questions
What is a good refinance break-even period?
Under 36 months is excellent, 36 to 60 months is acceptable if you plan to stay long-term, and over 60 months typically means the refinance is not worth the closing costs unless you are resetting an ARM or removing PMI.
Are closing costs always worth paying up front?
Not always. A no-cost refinance rolls closing costs into a slightly higher rate, usually 0.25 to 0.5 percentage points above the best rate. That works well if you plan to move in under 3 years. Paying closing costs up front wins when you will stay 5 plus years.
Does refinancing restart the loan term?
By default yes — a new 30-year refinance resets the clock, even if you only had 22 years left. That can mean more total interest paid over time. To avoid this, refinance into a 15 or 20-year term, or make extra principal payments to match your original payoff date.
How much rate drop do I need to refinance?
The classic rule is 0.75 to 1 percentage point. With today closing costs averaging $4,000 to $6,000, even a 0.5 point drop can pay off in under 4 years if you are staying put. Run your numbers here before deciding.
Can I refinance to drop PMI?
Yes — if your home has appreciated enough that your loan-to-value ratio is at or below 80 percent, refinancing eliminates private mortgage insurance (PMI). On a $300k loan, PMI savings of $150 to $250 per month alone can justify a refinance even without a rate drop.
Is this calculator private?
Yes. All calculations run locally in your browser. Nothing is sent to a server.