Free US Mortgage Refinance Calculator: Break-Even & Closing Costs

Select from 4 refinance modes: Rate & Term (lower rate), Cash-Out (tap equity), ARM→Fixed (escape uncertainty), or Shorten Term (30→15yr). Each mode unlocks different input panels and applies the correct financial logic automatically.

Input your remaining balance, home value (for LTV), current rate, remaining term, monthly PMI (enter $0 if none), and months already paid. Find these on your most recent mortgage statement or servicer portal.

Input the new rate and term from your lender’s Loan Estimate. Use actual quotes — not current market averages — for the most accurate breakeven. For ARM→Fixed, enter your current ARM rate, rate cap, and months to next reset.

Total your lender fees, title costs, appraisal, and discount points from Page 2 of your Loan Estimate. Toggle “Roll costs into loan?” to model financing them vs. paying upfront. Rolling costs increases your balance but reduces cash needed at closing.

Enter your marginal federal tax rate and expected investment return (default 8%). The NPV engine discounts all future cash flows at your investment rate, so you see the true economic cost of refinancing vs. staying and investing the closing cost savings.

Drag the “Years You Plan to Stay” slider. This single input determines your verdict — the calculator compares your stay period directly against the break-even date to issue a Go / Wait / Caution verdict with full NPV confirmation.

Market rate averages from Bankrate or Freddie Mac are shown for reference only. Your personal rate depends on FICO, LTV, DTI, and loan type. Always plug in your official Loan Estimate numbers.

The #1 mistake borrowers make is overestimating how long they’ll stay. The US Census Bureau reports the median homeowner moves every 8 years. Model 5–7 years if you’re uncertain.

Lender fees, title insurance, appraisal ($500–$800), recording fees, prepaid interest, and discount points all belong in the closing costs field. Underestimating extends your true break-even significantly.

You take out a new mortgage that pays off your existing mortgage. From that day forward, you make payments on the new loan only. The new loan has its own rate, term, closing costs, and amortization schedule. Your old loan stops existing.

Most borrowers refinance to lower their monthly payment, shorten the term, switch from ARM to fixed, remove PMI, or tap home equity with a cash-out. This calculator supports all four scenarios so you can see the numbers behind each decision.

You pay closing costs upfront (and sometimes a slightly higher rate) in exchange for a different payment profile. The decision is good only if the long-term savings after your break-even date are bigger than the costs and risks you take on.

Break-even tells you how many months it takes for your monthly savings to repay what you spent on closing costs. If you move or refinance again before that point, you never recover the initial cost. That is why this calculator always asks how long you plan to stay.

Break-even ignores what you could have earned by investing your closing-cost money elsewhere. NPV discounts all future payments using your chosen investment return so you can compare “refi vs stay” on an equal, time-value-of-money basis.

Instead of eyeballing rates and guessing, the calculator crunches the full amortization for both loans, factors in PMI and tax effects, and tells you: Will I save money? When do I break even? And how big is the win or loss over my stay period?

Fields: Current balance, home value, current interest rate, remaining term, current monthly PMI, months since origination. These define your “stay put” scenario — what happens if you change nothing.

Fields: New interest rate, new term (30, 20, 15, 10 years), and refinance type. For ARM→Fixed and Cash-Out, extra panels appear for ARM caps, months to reset, cash-out amount, and high-interest debt amounts.

Fields: Total closing costs, roll costs into loan (yes/no), and discount points slider. The calculator adds points cost to closing costs and, if rolled in, increases your new principal to reflect financed fees.

Fields: Marginal tax rate and investment return if you do not refinance. The tax rate affects your after-tax cost of debt. The investment return powers the NPV engine and “refi vs invest” decision.

Field: Years you plan to stay in the home. This slider directly compares your time horizon to the break-even date. If your stay period is shorter than break-even, the verdict will almost always tell you to wait.

Tabs: Rate & Term, Cash-Out, ARM→Fixed, Shorten Term. Each mode tweaks validation rules and calculations. For example, Cash-Out enforces LTV checks; ARM→Fixed enables the ARM risk panel.

The colored banner at the top summarizes the decision: Strong Refinance Case (green), Proceed with Caution (navy), or Refinance Does Not Pay Off (orange). It uses your break-even, stay period, and NPV to classify your scenario.

The Break-Even Timeline bar compares two points in time: when you recover costs, and when you actually move. If the “Your Stay” marker sits to the right of the break-even marker, refinancing pays off before you move. If it sits to the left, it does not.

The KPI tiles show new payment, monthly savings, lifetime interest saved, after-tax rate, new LTV, and total interest on the new loan. Green tiles indicate clear wins (savings or lower risk). Amber or red tiles highlight trade-offs you should think about.

If your refinance removes PMI, the PMI panel quantifies that extra savings. If you’re coming from an ARM, the ARM alert panel shows your worst-case payment if the ARM hits its cap, versus the fixed-rate payment — making the risk comparison concrete.

The NPV section compares “NPV of refinancing” and “NPV of staying”. The block marked in green is the cheaper option in today’s dollars. The explanation line underneath tells you how much cheaper it is over your stay horizon at your chosen investment return.

The balance chart shows how fast each loan pays down over time. The interest chart shows annual interest paid each year. The amortization table summarizes year-by-year balances and interest, with the break-even year highlighted so you can see exactly where the crossover happens.

Refinancing into a 30-year loan to save $150/mo looks great — until you realize you will move in 3 years and your break-even is 5 years. In that case, you paid thousands in closing costs for savings you never collect. Always start by setting a realistic stay period in the calculator.

If you have 23 years left and refinance into a fresh 30-year loan, you’ve quietly added 7 more years of payments. Your monthly payment drops, but total interest can actually increase. The “Total Interest New” KPI and amortization comparison in this tool are designed to surface that hidden cost.

Rolling credit card debt into your mortgage can be smart when it replaces 22% APR with 7% APR and you stop using the cards. Using cash-out for vacations, cars, or lifestyle creep turns short-term spending into 30-year debt. Always run a cash-out scenario in the calculator and check NPV before committing.

For ARM borrowers, the risk is not today’s payment — it’s the reset payment at the cap. The ARM risk panel in this tool shows that worst-case number side-by-side with your fixed-rate payment. If the cap payment would break your budget, that is a strong argument for locking in now.

Once you find a quote where break-even and NPV both look good, save a screenshot or PDF of the results. Then send it to competing lenders and ask them to beat the savings or lower the costs. The numbers from this calculator make those conversations concrete instead of vague.

If you believe rates will fall further, you can still refinance now as long as your break-even is short. Think of this as a “bridge refinance”: it stabilizes your payment and removes risk now, while still leaving room to refinance again later if rates drop meaningfully.