Last updated: July 2026
How This Mortgage Refinance Calculator Works
A mortgage refinance can save you tens of thousands of dollars, or it can quietly cost you money while feeling like a win. The only way to know which one you are looking at is to run your actual numbers. This free mortgage refinance calculator does that in seconds, with no sign-up. Enter your current loan and the terms you have been quoted, and it shows you the new monthly payment, how much you save each month, how long until you recoup your closing costs, and what the move does to your lifetime interest.
What Is a Refinance Break-Even Point?
The break-even point is the moment your monthly savings from refinancing finally add up to what you paid in closing costs. Before that month, the refinance has cost you money; after it, every payment is pure savings. It is the single most important number in the refinance decision, and the math behind it is simple:
Break-even months = Total closing costs ÷ Monthly savings
In plain words: take everything the refinance costs you upfront, then divide it by how much lower your new monthly payment is. The answer is how many months you have to keep the loan before the deal turns positive. Worked example: if your refinance carries $6,000 in closing costs and lowers your payment by $250 a month, then $6,000 ÷ $250 = 24 months. You break even in two years. Stay in the home longer than that and you come out ahead; sell or refinance again before month 24 and you lose money on the deal.
Current Loan Balance is what you still owe today, not the original amount you borrowed. Current Interest Rate is the rate on your existing mortgage, and Years Remaining is how much time is left on it — a loan you took out five years ago on a 30-year term has 25 years remaining. On the other side, New Interest Rate is the refinance rate a mortgage lender has offered you, New Loan Term is the length of the new loan, and Closing Costs is the total upfront cost of the refinance, which typically runs 2 to 5 percent of the loan amount.
What the Results Actually Mean
Three numbers decide whether a mortgage refinance is worth it. The first is Monthly Savings — the difference between your old payment and your new one. The second is the Break-Even Point, which tells you how many months it takes for those monthly savings to pay back your closing costs. If your closing costs are $5,000 and you save $250 a month, you break even in 20 months. Stay in the home past that point and the refinance is money in your pocket; sell or move before it and you lose money on the deal.
The third number is Lifetime Savings, and it is the one most people ignore at their own expense. Here is the trap: refinancing a loan with 25 years left into a fresh 30-year term almost always lowers your monthly payment, because you are stretching the balance over more years. But a longer term can raise your total interest even when the monthly payment drops. This calculator shows both the new monthly payment and the full lifetime figure precisely so you do not get fooled by a lower monthly number that actually costs you more over time. If the lifetime figure comes back negative, the refinance is more expensive across the full loan even though your monthly cash flow improves — that can still be the right call if you badly need lower payments now, but you should make that trade knowingly.
If the break-even line reports no monthly savings, your new rate and term simply do not produce a lower payment, and refinancing at those terms does not make sense. Go back and check the rate you were quoted, or wait for refinance rates to fall further before you move. To sanity-check the raw payment math on any loan, our Loan Payment Calculator breaks down the monthly figure for any balance, rate, and term.
Refinance Savings Table: A $300,000 Mortgage
To see how the rate drop drives your savings, here is what refinancing a $300,000 balance from a 7.5% rate looks like at three different new rates. Each row assumes a fresh 30-year term and about $6,000 in closing costs. The current payment at 7.5% is $2,097.64 a month.
| New Rate | New Monthly Payment | Monthly Savings | Break-Even (~$6,000 costs) |
|---|---|---|---|
| 6.75% | $1,945.79 | $151.85 | 40 months (3.3 yr) |
| 6.50% | $1,896.20 | $201.44 | 30 months (2.5 yr) |
| 6.00% | $1,798.65 | $298.99 | 21 months (1.7 yr) |
The pattern is clear: a bigger rate drop means larger monthly savings and a faster break-even. Dropping a full 1.5 points to 6.0% saves nearly $300 a month and pays back the closing costs in under two years, while a modest 0.75-point drop to 6.75% takes more than three years to break even — fine if you are staying put, risky if you might move. Plug your own balance, rate, and closing costs into the calculator above for figures matched to your loan.
When Refinancing Is Actually Worth It
The old rule of thumb was that refinancing paid off once you could drop your rate by at least one full percentage point. That is still a reasonable starting signal, but the real test is your break-even point measured against how long you plan to stay in the home. If you can recoup your closing costs comfortably before you expect to sell, a refinance is usually worth it even on a smaller rate drop. If you might move in two years and your break-even is three years out, it is not.
Beyond the rate, a few situations make refinancing especially attractive. If you are moving from an adjustable-rate mortgage to a fixed rate, the certainty alone can justify the cost. If your credit score has climbed significantly since you bought, you may now qualify for a materially better rate than your original loan. And if you have built enough equity to drop private mortgage insurance, eliminating that premium can add to your monthly savings on top of the rate improvement. Before you commit, it also helps to revisit the bigger picture of what you can comfortably carry — our Mortgage Affordability Calculator and our guide on how much house you can afford keep the new payment grounded in your real budget. For a deeper walkthrough of the decision itself, see our full guide on whether you should refinance your mortgage.
Cash-Out Refinance vs. HELOC and Home Equity Loans
A standard rate-and-term refinance simply replaces your existing mortgage with a cheaper one. A cash-out refinance goes further — you borrow more than you currently owe and take the difference in cash, tapping the equity in your home. It can be a low-rate way to fund a major expense, but it resets your mortgage and increases the balance you owe, so the break-even math matters even more.
The main alternative to a cash-out refinance is a HELOC or a home equity loan. Rather than replacing your first mortgage, these sit on top of it as a second loan, which means you keep your existing low rate untouched — a big deal if you locked in a great rate years ago. A HELOC works like a revolving line of credit you draw from as needed, while a home equity loan hands you a lump sum at a fixed rate. Which one wins depends on your existing rate, how much you need, and whether you want a fixed payment. We compare all three side by side in our guide to cash-out refinance vs. HELOC. Whichever route you take, remember that a larger loan usually means higher homeowners insurance requirements from your lender, so factor that into your monthly figure.
Closing Costs, Credit Scores, and Shopping Lenders
Closing costs are the fee side of every refinance, and they are why the break-even point exists at all. A typical refinance runs 2 to 5 percent of the loan amount and bundles together the lender origination fee, an appraisal, title insurance and a title search, recording fees, and prepaid items like interest and escrow. Some lenders advertise a no-closing-cost refinance, but that money does not vanish — it is folded into a higher interest rate or added to your balance, so you pay it slowly instead of upfront. Our breakdown of mortgage refinance costs walks through each line item so nothing surprises you at the closing table.
Your credit score is the single biggest lever on the refinance rate you are offered. The same loan can carry a rate a full point or more higher for a borrower in the mid-600s than for one above 760, and over a 30-year term that gap is worth tens of thousands of dollars. If your score has slipped, it is often worth spending a few months rebuilding it before you apply. Finally, do not take the first quote you receive. Rates and closing costs vary meaningfully between the best mortgage refinance lenders, and gathering several quotes within a short window counts as a single credit inquiry for scoring purposes. A handful of quotes can easily be worth thousands over the life of the loan.
When Should I Remortgage in the UK? (And How Canada and Australia Differ)
Refinancing goes by different names — and follows genuinely different rules — outside the US. In the UK it is called remortgaging, and the trigger is usually the end of your 2- or 5-year fixed deal: do nothing and you roll onto your lender’s standard variable rate (SVR), which is typically far higher. Start shopping around six months before your deal ends — most offers stay valid for three to six months, so you can lock a rate early and switch the day your fix expires, with no early repayment charge. In Canada, mortgages come up for renewal at the end of every term anyway (often 5 years), which costs little — a refinance is the separate move of borrowing more against your equity, capped at 80% of the home’s appraised value. In Australia, watch your LVR: refinance to a new lender while still above 80% and you pay lenders mortgage insurance (LMI) all over again, because LMI does not transfer.
| Country | What It’s Called | Typical Trigger and Catch |
|---|---|---|
| US | Refinance (rate-and-term or cash-out) | Rate drop; closing costs 2–5% set the break-even |
| UK | Remortgage | End of fixed deal — act ~6 months early or land on the SVR |
| Canada | Renewal (term end) or refinance (equity) | Every term; refinancing capped at 80% of appraised value |
| Australia | Refinancing | Better rate — but LMI is charged again if LVR is still above 80% |
The calculator above works for all four: the break-even maths is identical in pounds or dollars. Enter your balance, both rates, and put arrangement, legal, discharge, or switching fees in the Closing Costs box — then sanity-check the raw payment with our loan payment calculator if the quote looks off.
Related Financial Calculators
Refinancing is one piece of managing your home and your money. These tools help with the rest:
- Mortgage Affordability Calculator — See what monthly payment and home price fit your income.
- How Much House Can I Afford — A plain-language guide to setting your budget before you borrow.
- Renting vs. Buying a Home in 2025 — Compare the true long-run cost of owning against renting.
- Loan Payment Calculator — Work out the monthly payment on any loan, rate, or term.
- Rent vs. Buy Calculator — Weigh the full cost of buying against renting before you commit.
Frequently Asked Questions
Refinancing makes sense when your new rate lowers your payment enough to recoup the closing costs before you plan to sell or move, and when the overall move fits your goals. Start by comparing your current rate to the rate you have been quoted, run both through the calculator above, and look at the break-even point. If you will comfortably stay in the home past break-even, refinancing usually pays off. It is also worth it if you are switching from an adjustable rate to a fixed one, dropping mortgage insurance, or your credit has improved enough to unlock a materially better rate.
The break-even point is when your accumulated monthly savings equal what you paid in closing costs. The formula is simple: break-even months = total closing costs ÷ monthly savings. For example, $6,000 in closing costs divided by $250 of monthly savings equals 24 months, so you break even in two years. Every month after that point is money saved; every month before it, you are still recovering the upfront cost. This is why your time horizon in the home matters more than the size of the rate drop alone.
The classic rule of thumb is a drop of at least one full percentage point, but the honest answer is that it depends on your break-even point. What really matters is whether the monthly savings recoup your closing costs before you plan to sell or move. A smaller rate drop can still pay off if you are staying put for many years and your closing costs are low, while even a large drop may not be worth it if you expect to move soon.
Often, yes. A one-point rate drop is the classic threshold because it usually produces meaningful monthly savings. On a $300,000 balance, moving from 7.5% to 6.5% cuts the payment by about $201 a month, which recovers roughly $6,000 in closing costs in around 30 months. If you plan to keep the loan well past that break-even point, a 1% drop is generally worth it. But the rule is only a starting signal — run your exact numbers, because a shorter time in the home or unusually high closing costs can flip the answer.
Refinance closing costs typically run 2 to 5 percent of the loan amount, so a $300,000 refinance often costs between roughly $6,000 and $15,000. That total bundles the lender origination fee, an appraisal, title insurance and a title search, recording fees, and prepaid items like interest and escrow. A no-closing-cost refinance does not erase these costs — it rolls them into a higher rate or a larger balance, so you pay them over time instead of upfront. See our mortgage refinance cost breakdown for each line item.
It will almost always lower your monthly payment, but not necessarily your total cost. Stretching a balance that had 25 years left back out to 30 years can raise your lifetime interest even at a lower rate, because you are paying for five extra years. This calculator shows both the monthly payment and the lifetime figure so you can see the full picture. If lower monthly cash flow is your goal, the longer term may be exactly right — just make the trade with your eyes open.
Generally a score of 740 or above unlocks the best mortgage refinance rates, while scores in the 620 to 700 range still qualify but at higher rates. Because your credit score can swing your rate by a full percentage point or more, it is often worth spending a few months improving it before you apply. Always compare the actual rate you are quoted against your current mortgage rate rather than relying on advertised headline rates.
A cash-out refinance replaces your existing mortgage with a new, larger loan and hands you the difference in cash, letting you tap the equity you have built in your home. For instance, if you owe $200,000 and refinance into a $250,000 loan, you pocket roughly $50,000 (before costs) to use for renovations, debt consolidation, or other major expenses. Because it resets your mortgage and increases your balance, a cash-out refinance makes the most sense when the new rate is still attractive; if you locked in a low rate years ago, a HELOC or home equity loan that leaves your first mortgage untouched is often the smarter route.
It depends on your existing mortgage rate. A cash-out refinance replaces your whole mortgage, so if you locked in a low rate years ago you would lose it — usually a bad trade in a higher-rate environment. A HELOC or home equity loan leaves your first mortgage untouched and adds a second loan on top, which is often the smarter choice when your current rate is already good. If you need a large sum and your existing rate is high anyway, a cash-out refinance can make sense.
A renewal happens automatically at the end of your mortgage term (commonly 5 years): you keep the same balance and simply agree on a new rate and term, usually with no legal or appraisal fees — though you should still shop rather than sign the lender’s first offer. A refinance is a different transaction: you replace the mortgage, optionally borrowing more against your equity up to 80% of the home’s appraised value, and it does involve legal and appraisal costs. Breaking your term mid-way to refinance also triggers a prepayment penalty that can run to five figures, so many Canadians time a refinance to coincide with renewal. To compare a renewal offer here, enter your remaining balance, both rates, and near-zero closing costs.
The same break-even test applies: it is worth it when your monthly saving repays the switching costs — discharge fee, new application fee, and government charges — well before you plan to sell. The uniquely Australian trap is lenders mortgage insurance: if your LVR is still above 80%, a new lender will charge a fresh LMI premium that can run into the thousands, even if you paid LMI on the original loan, because it never transfers. In that case it usually pays to wait until repayments or price growth pull your LVR to 80% or below. Enter all switching costs (including any LMI quote) in the Closing Costs box above to see your true break-even.
Yes — the formula does not care about currency, so enter everything in pounds. Put your outstanding balance, your current rate (or the SVR you would roll onto, which is often the more honest comparison), the new deal’s rate and term, and use the Closing Costs box for the product fee plus any legal and valuation costs. One UK-specific check: if you are leaving a fixed deal before it ends, add the early repayment charge to costs — it frequently flips the answer to “wait until the deal expires.” Since offers stay valid for months, you can lock a new rate up to six months ahead and switch penalty-free the day your fix ends.
Financial Disclaimer: This calculator provides estimates for educational purposes only. Actual loan terms, rates, closing costs, and fees vary by lender and your credit profile. This tool does not constitute financial advice and does not recommend any specific lender or product. Always review any loan agreement carefully and consult a qualified financial professional before refinancing your mortgage.