Know before you refinance. This calculator tells you the exact month you’d break even on closing costs, whether refinancing actually saves money given how long you plan to stay, and how much total interest a new loan would carve off your remaining balance. Every figure updates in real time as you adjust your numbers.
Pro tip: Forget the old “1% rule” — it ignores closing costs, your remaining loan balance, and how long you’ll stay. A 0.5% drop can be a slam dunk if you have a big balance and 10 years ahead of you, while a 1.5% drop can be a waste if you’re moving in two years. Break-even month is the only number that matters.
| New Rate | New Payment | Monthly Savings | Break-Even Month | Verdict |
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How to Use the Mortgage Refinance Calculator
Start with your remaining loan balance — the principal left on your mortgage, not the original amount you borrowed. Pull this from your most recent mortgage statement or your lender’s online portal. Next, enter your current rate and monthly principal-and-interest payment (escrow for taxes and insurance does not change when you refinance, so leave that out). Then type in the rate your lender quoted you, pick a new term, and tell the tool how long you actually plan to stay in the house. Results update as you type — no “calculate” button needed.
The verdict badge at the top of the results is the most important number on the page. If it’s green, you break even before you plan to move. If it’s red, the closing costs will outlast your stay and you’ll leave with a net loss. Everything else — monthly savings, lifetime interest, payment reduction — is context for that single decision.
How the Break-Even Month Is Calculated
The break-even formula is disarmingly simple: closing costs ÷ monthly savings = break-even months. If your refinance costs $8,000 and lowers your payment by $240 per month, you break even in roughly 34 months — a little under three years. Stay longer than that and the refi saves you real money. Move before then and you’ve paid the bank thousands of dollars for nothing.
A more rigorous version of this math also accounts for the fact that a fresh 30-year restart resets your amortization clock — you pay more interest and less principal in the early years of any new loan. For short-term stays, that rarely matters. But if you’re refinancing from a 30-year that’s 12 years in, rolling into another 30-year extends the total repayment period by 12 years. That’s why this tool also reports lifetime interest savings, not just monthly payment drops.
The 1% Refinance Rule Is Outdated — Here’s What to Use Instead
For decades, loan officers told homeowners not to refinance unless rates dropped by at least one full percentage point. That rule comes from an era when closing costs were smaller relative to balances and mortgages were held longer on average. It was always a rough heuristic, and today it’s actively misleading.
The only rule that actually works is: your break-even month has to land well before the month you expect to move. A 0.5% rate drop on a $600,000 balance can break even in under two years — a no-brainer for anyone staying put. A 1.25% drop on a $140,000 balance with $7,000 in closing costs might take eight years to recoup. Loan size, closing costs, and your stay timeline matter far more than the rate delta itself.
What a Refinance Actually Costs: The Closing-Cost Breakdown
Refinance closing costs typically run 2% to 5% of the loan amount, with 2–3% being the norm for borrowers with good credit. The breakdown in the tool above shows where the money goes:
- Origination / lender fees — Roughly 0.5–1% of the loan. This is the lender’s profit margin and the most negotiable line item.
- Appraisal — $400–$700 for a standard home, more for high-value or rural properties. Some lenders waive this with an automated valuation.
- Title insurance and settlement — Typically $800–$2,500 depending on state. In some states (like Florida and Texas) this is the single largest cost.
- Recording, flood, and government fees — Usually $100–$400, non-negotiable, set by your county.
- Credit report, tax service, and miscellaneous — A few hundred dollars total. Minor but real.
Always request a Loan Estimate — a federally mandated three-page disclosure lenders must provide within three business days of applying. It lists every closing cost line item. Get Loan Estimates from at least two lenders and put them side by side; the differences are frequently in the thousands.
When a No-Closing-Cost Refinance Actually Wins
“No closing cost” is a marketing term, not a gift. Lenders roll the closing costs into a slightly higher rate — typically 0.25–0.5% higher than they’d offer if you paid costs upfront. You’ll pay the same money over time, just differently.
The math that decides which option wins hinges entirely on how long you stay. If you plan to move in 3–4 years, the no-closing-cost refi almost always wins: you’d never have recovered the upfront costs in such a short window anyway. If you plan to stay 10+ years, paying closing costs upfront usually wins because the lower rate compounds over time. For 5–7 year timelines, it’s close enough that the Pro sensitivity analysis pays for itself.
Refinancing from 30 Years to 15 Years: The Hidden Deal
A 15-year refi is one of the most financially powerful moves a homeowner can make — and also one of the most misunderstood. The monthly payment goes up, often by 40–50%. But the lifetime interest savings are enormous because shorter-term loans carry meaningfully lower rates and have far fewer months of interest accrual.
On a $300,000 balance, a 30-year at 6.75% costs roughly $400,000 in total interest. A 15-year at 6.10% costs about $158,000 — a savings of around $242,000 in lifetime interest. The monthly payment is about $600 higher, but every extra dollar you send each month retires approximately $5 of future interest. That’s the “interest-saved-per-dollar-paid” leverage you’ll see in the Pro analysis above, and it’s the single best number for deciding whether the payment increase is worth it for your income.
Negotiating Closing Costs — What’s Actually on the Table
A surprising amount of the Loan Estimate is negotiable. Originator fees, lender credits, and some third-party services can be reduced by lenders competing for your loan. State-mandated fees (recording, transfer taxes) cannot. The strongest negotiating tool is a competing Loan Estimate from another lender — loan officers are trained to match or beat a signed rival offer to avoid losing the file.
Ask specifically about lender credits, which are dollars the lender applies to your closing costs in exchange for accepting a slightly higher rate. Credits can cover $500–$4,000 of closing costs depending on the loan. They’re essentially a partial no-closing-cost structure and often the smartest middle path for homeowners planning to stay 5–8 years.
When Refinancing Is Usually a Mistake
Three common situations make refinancing a bad financial move no matter what rates look like: you’re planning to sell within two years, you’re more than halfway through your current loan’s amortization (resetting the clock costs more in future interest than the monthly savings deliver), or you’re refinancing to cash out equity at a higher rate than your first mortgage. The break-even math usually catches the first two. The third one — cash-out refis at worse rates — is where this tool will strongly suggest you consider a home equity loan or HELOC instead of touching your existing low-rate first mortgage.
Related tools: use the Mortgage Calculator to price out your new payment including taxes and insurance, or the Home Affordability Calculator if you’re weighing a refi against buying a new home. Browse all Home & Real Estate tools.
Frequently Asked Questions
When is refinancing worth it?
Refinancing makes sense when the break-even point (closing costs divided by monthly savings) comes before you plan to sell or pay off the home. Forget the old 1-percent-drop rule; it ignores closing costs and loan balance. A 0.5 percent drop on a 500,000 dollar balance with 3,000 dollars closing can break even in 8 months.
How do I calculate refinance break-even?
Divide total closing costs by the monthly payment savings. If closing costs are 5,000 dollars and you save 150 per month, break-even is 33 months (2.75 years). If you plan to move in 3 years, it's marginal; in 10 years, it's clearly worth it.
Can I roll closing costs into the refinance?
Yes. You can either add closing costs to the loan balance (no-cash refi) or accept a slightly higher rate in exchange for a lender credit. Rolling costs in preserves cash but slightly extends amortization. Lender credits avoid upfront cost but raise your rate 0.25 to 0.5 percent.
How much does refinancing cost?
Typical refinance closing costs run 2 to 5 percent of the new loan amount. On a 300,000 dollar loan, expect 6,000 to 15,000 dollars. Main line items: origination (0.5 to 1 percent), appraisal (500 to 800), title insurance (0.5 percent), prepaid interest, and recording fees. Always shop at least 3 lenders.
Does refinancing restart my loan term?
Typically yes - a 30-year refinance starts a new 30-year clock. If you're 10 years into a 30-year mortgage and refinance to another 30-year, you've added 10 years of payments. Refinance to a 20-year loan to keep your original payoff date, or make extra principal payments on the new loan to hit the old target.