How to Use This Calculator
This calculator compares two scenarios side by side: staying on your current mortgage versus refinancing into a new loan. To get accurate results, you need six pieces of information.
Remaining balance is the current principal you still owe — not the original loan amount. Check your most recent mortgage statement for the exact figure.
Current interest rate is the annual percentage rate on your existing mortgage. This is on your original loan documents or monthly statement — it will not change unless you have an adjustable-rate mortgage (ARM).
Months remaining tells the calculator how long you would continue paying if you don't refinance. A 30-year mortgage started 5 years ago has about 300 months remaining. Use 360 for a brand-new 30-year loan, 300 for 25 years left, 240 for 20, 180 for 15, and 120 for 10.
New interest rate is the rate you've been quoted or are researching for the refinance. Use your actual quote for the most accurate result — advertised rates assume excellent credit and may not reflect your offer.
New loan term is the term you'd refinance into. A 30-year refi restarts amortization from scratch; a shorter term (15 or 20 years) accelerates payoff but raises the monthly payment.
Closing costs are the upfront fees you pay to complete the refinance. These typically run 2–5% of the loan amount and include the origination fee, appraisal, title search, title insurance, recording fees, and prepaid interest. Your lender is required to give you a Loan Estimate within 3 business days of application — use that figure here.
The Refinance Break-Even Formula
The break-even point answers the most important question in a refinance decision: how long does it take for your monthly savings to offset the upfront closing costs?
Both monthly payments are calculated using the standard amortization formula:
Where P is the loan balance, r is the monthly rate (annual rate ÷ 12 ÷ 100), and n is the number of payments.
Worked example: $350,000 balance, current rate 7.5% with 300 months remaining, refinancing to 6.5% on a new 30-year loan with $5,000 in closing costs.
- Current payment: $350,000 at 7.5% for 300 months ≈ $2,578/month
- New payment: $350,000 at 6.5% for 360 months ≈ $2,212/month
- Monthly savings: $2,578 − $2,212 = $366/month
- Break-even: $5,000 ÷ $366 = 14 months
In this scenario, if you plan to keep the loan for more than 14 months (very likely), the refinance pays for itself. The calculator also shows lifetime interest savings — the total interest differential minus the closing costs — to reveal the full financial picture.
When Does Refinancing Make Sense?
The classic rule of thumb says to refinance when rates drop by at least 1%. That's a reasonable starting point, but the actual threshold depends on your loan balance, closing costs, and how long you plan to stay in the home.
On a $500,000 loan, a 0.5% rate reduction saves roughly $150/month — and at $6,000 in closing costs, you break even in 40 months. That's borderline for someone who might sell in 3–4 years, but clearly worth it if you plan to stay 10+ years. On a $150,000 loan, that same 0.5% rate drop might only save $45/month, pushing the break-even past 11 years at the same closing cost level.
As a general guide:
| Break-Even Period | Interpretation | Typical Recommendation |
|---|---|---|
| Under 24 months | Fast payback | Strong yes |
| 24–48 months | Moderate payback | Depends on tenure plans |
| 48+ months | Slow payback | Usually not worth it |
| No monthly savings | Higher payment | Only for strategic reasons |
The break-even period is only part of the story. Even if the break-even is 30 months, the lifetime interest savings may be $40,000 — that's a significant outcome for someone who stays in the home long-term. Always look at both the break-even and the net lifetime savings together before deciding.
Rate environment matters too. Refinancing when rates are falling is obvious, but refinancing into a lower rate now — even if rates might fall further — locks in guaranteed savings. Trying to time the absolute bottom of a rate cycle is difficult; the cost of waiting wrong can exceed the benefit of waiting right.
Types of Refinancing
Not all refinances serve the same purpose. Understanding the type helps you match the right product to your goal.
Rate-and-term refinance is the most common type. You replace your existing mortgage with a new one at a different interest rate, a different term, or both — without changing the loan balance (other than rolling in closing costs). The goal is to reduce the rate, lower the monthly payment, or shorten the payoff timeline. This calculator is primarily designed for rate-and-term scenarios.
Cash-out refinance lets you borrow more than you currently owe, converting equity into cash. For example, if you owe $250,000 on a home worth $450,000, you might refinance for $320,000 and pocket $70,000 (less closing costs). The trade-off: a higher loan balance, typically a slightly higher rate, and a longer path to payoff. Cash-out refis are useful for home improvements, debt consolidation, or large expenses — but they reset equity accumulation.
Streamline refinance programs (FHA Streamline, VA IRRRL, USDA Streamline) are simplified processes for existing government-backed loan holders. They require less documentation, often skip a new appraisal, and close faster than conventional refinances. The trade-off is eligibility restrictions: you must have an existing FHA, VA, or USDA loan, and the refinance must demonstrably lower your rate or monthly payment.
Hidden Costs of Refinancing
Closing costs on a refinance typically run 2–5% of the loan amount. On a $350,000 loan, that's $7,000–$17,500 — a real cost that can take years to recoup. Here's what's typically included:
| Cost Item | Typical Range | Notes |
|---|---|---|
| Origination / Lender Fee | 0.5%–1% of loan | Negotiable; shop multiple lenders |
| Appraisal | $400–$700 | Waived on some streamline programs |
| Title Search & Insurance | $700–$1,500 | Required by lenders |
| Recording Fees | $25–$250 | Varies by county |
| Prepaid Interest | 0–30 days of interest | Covers interest through month-end at closing |
| Escrow Reset | 2–3 months of taxes/insurance | New lender typically requires escrow cushion |
A no-closing-cost refinance doesn't eliminate these fees — it rolls them into a higher interest rate (lender-paid) or adds them to the loan balance (borrower-paid). The rate premium for lender-paid closing costs is typically 0.25%–0.5% above market. That can make sense if you plan to sell or refinance again within the break-even window of a standard deal, but it costs more long-term.
Refinancing Scenarios and Examples
Real-world outcomes vary significantly based on the numbers. Here are three common scenarios:
| Scenario | Good Deal | Marginal | Term Extension |
|---|---|---|---|
| Balance | $350,000 | $150,000 | $280,000 |
| Current Rate | 7.5% | 6.85% | 6.5% |
| Months Remaining | 300 | 300 | 180 |
| New Rate | 6.5% | 6.75% | 6.0% |
| New Term | 30 years | 30 years | 30 years |
| Closing Costs | $5,000 | $4,500 | $7,000 |
| Monthly Savings | +$366/mo | +$45/mo | +$563/mo |
| Break-Even | 14 months | 100 months | 13 months |
| Verdict | Strong yes | Not worth it | Watch total interest |
The term extension scenario deserves special attention. Refinancing a 15-year remaining loan into a new 30-year drops the payment by $563/month and breaks even in 13 months — that looks great. But you've added 15 years to your payoff timeline, and total interest paid likely increases by tens of thousands of dollars even at the lower rate. This trade-off is sometimes the right call (cash flow relief, investment opportunities), but it's critical to look at the full interest comparison, not just the monthly payment change.
Impact of Loan Term on Refinancing
The term you choose for your new loan dramatically affects both the monthly payment and the total interest cost. Shorter terms carry lower rates and save more interest overall, but the payment is higher. Here's how a $300,000 balance refinanced at 6.5% compares across standard terms:
| Term | Monthly Payment | Total Interest | Total Cost |
|---|---|---|---|
| 10 years | $3,390 | $106,800 | $406,800 |
| 15 years | $2,613 | $170,340 | $470,340 |
| 20 years | $2,237 | $236,880 | $536,880 |
| 25 years | $2,017 | $305,100 | $605,100 |
| 30 years | $1,896 | $382,560 | $682,560 |
A 10-year term costs $3,390/month but pays only $106,800 in interest over the life of the loan. A 30-year term at the same rate costs $1,896/month — $1,494 less per month — but pays $275,760 more in interest. The right term depends on your cash flow, income stability, and whether you're likely to sell or refinance again within the term.
A useful middle ground for many borrowers is a 15-year refinance: the rate is typically 0.5–0.75% lower than a 30-year (lenders price shorter terms better because the risk window is shorter), the payment is higher but manageable, and total interest savings can be $150,000–$250,000 compared to restarting a 30-year loan.
Current Refinance Rate Environment (2025–2026)
As of mid-2025, 30-year fixed refinance rates for conventional loans range from approximately 6.4% to 7.2% for well-qualified borrowers (credit score 740+, LTV under 80%). Borrowers with scores in the 680–720 range typically see rates 0.25%–0.5% higher. Jumbo loans (above conforming limits) are priced independently and may be lower than conforming rates for strong borrowers with substantial assets.
The 15-year refinance rate runs roughly 0.5%–0.75% below the 30-year rate, typically landing in the 5.7%–6.5% range for qualified borrowers. FHA refinance rates are often 0.25%–0.5% below conventional for borrowers with lower down payments or credit scores, though they carry mortgage insurance premiums (MIP) that add to the effective cost.
Rate lock timing matters. Mortgage rates can move 0.125%–0.25% in a single day on Federal Reserve news, inflation data (CPI, PCE), or employment reports. Most lenders offer a 30-day or 60-day rate lock at no cost, with longer locks available for a fee (typically 0.1%–0.25% of the loan amount per additional 15 days). If you're actively shopping, get quotes from at least three lenders — the spread between the best and worst offer is often 0.25%–0.5%, which translates to tens of thousands of dollars over the life of the loan.
Rate data referenced by this calculator is sourced from Freddie Mac's Primary Mortgage Market Survey (PMMS), which tracks weekly averages for 30-year and 15-year fixed-rate mortgages.
Frequently Asked Questions
How much should rates drop before refinancing?
A common rule of thumb is a drop of at least 0.5% to 1.0% in your interest rate to make refinancing worthwhile, but the actual threshold depends on your loan balance, closing costs, and how long you plan to stay. Use the break-even calculation: divide closing costs by your monthly payment reduction to find how many months it takes to recoup the upfront cost. If that number is less than the time you expect to remain in the home, refinancing likely makes financial sense.
Does refinancing restart my loan?
Yes, a rate-and-term refinance to a new 30-year mortgage resets your amortization schedule, which means you restart the interest-heavy early years of repayment. This can lower your monthly payment but extend the total payoff date and increase lifetime interest paid, even at a lower rate. The new payoff date shown in this calculator reflects that extension. If you want to keep your original payoff timeline, consider refinancing into a term that matches your remaining months.
What credit score do I need to refinance?
Conventional refinance loans typically require a minimum score of 620, but the best rates go to borrowers with 740 or higher. FHA streamline refinances can work with scores as low as 580. VA and USDA loans have more flexible requirements but still favor higher scores for rate purposes. Every 20-point improvement in your score can meaningfully reduce your offered rate, so it may be worth delaying a refi to raise your score if you're in the 600–680 range.
What is a no-closing-cost refinance?
A no-closing-cost refinance doesn't eliminate the costs — it shifts when and how you pay them. Lenders typically offer two structures: lender-paid closing costs in exchange for a higher interest rate (usually 0.25%–0.5% above market), or rolling the costs into the new loan balance. The right choice depends on how long you plan to keep the loan. If you'll sell or refinance again within a few years, avoiding upfront costs with a slightly higher rate may make more sense than paying $5,000–$10,000 upfront.
How soon after buying can I refinance?
Most conventional lenders allow you to refinance as soon as 6 months after closing. FHA streamline refinances require 6 months and at least 210 days since your first payment due date. Cash-out refinances typically require 12 months of seasoning. If rates drop significantly shortly after you purchase, you can usually refinance — but weigh the closing costs carefully against the savings window before your next likely move.
Can I refinance if I have a second mortgage or HELOC?
Yes, but it requires lien subordination — the second mortgage lender must agree to remain in second position behind the new first mortgage. Most lenders will agree if the combined loan-to-value (CLTV) ratio stays within acceptable limits (typically under 80–90%). Some second mortgage lenders charge a subordination fee ($150–$500). If the second lender refuses, you may need to pay off the second mortgage at closing.
Related Calculators
- Mortgage Calculator — Calculate your monthly payment for a new home purchase.
- Home Affordability Calculator — Find out how much house you can afford based on income and debts.
- Loan Payment Calculator — Calculate payments for any fixed-rate installment loan.
- Debt-to-Income Ratio Calculator — Check your DTI before applying for a refinance.
Methodology
This calculator uses the standard fixed-rate amortization formula (M = P × [r(1+r)^n] / [(1+r)^n − 1]) as published by the CFPB. Monthly payments are computed for both the current and new loan scenarios using the inputs provided. Total interest is calculated by walking the full amortization loop for each scenario. Break-even is computed by dividing the closing costs by the monthly payment reduction; a negative or zero payment reduction results in no break-even point. Lifetime savings equal total interest saved minus closing costs. All calculations are performed client-side in your browser — no data is stored or transmitted. Closing cost examples are sourced from the Consumer Financial Protection Bureau's closing cost survey and represent national averages. Rate ranges reference the Freddie Mac PMMS. Last updated: May 2026.