Loan Comparison Details
New Refinance Loan
How Does a Mortgage Refinance Calculator Work?
Refinancing involves replacing your existing home mortgage with a new debt instrument that carries updated terms, a revised interest rate, and a new repayment horizon. Using our mortgage refinance calculator allows you to evaluate whether interest reductions outweigh mandatory upfront origination fees, appraisal costs, and closing expenses.
Before proceeding with a refinance, compare your current multi-year debt payoff using our Mortgage Amortization Schedule Calculator or explore accelerated payoff alternatives via our Mortgage Extra Payment Calculator.
Understanding the Refinance Break-Even Formula
The single most crucial metric when evaluating a refinance is the break-even period. This is the exact number of months required for your monthly interest savings to fully recoup your upfront closing fees:
Break-Even Horizon (Months) = Total Refinance Closing Costs ÷ Monthly Payment Reduction
For example, if your lender charges $4,000 in closing costs and your new rate reduces your payment by $200 per month, your break-even horizon is exactly 20 months. If you plan to remain in your home longer than 20 months, the refinance creates net positive financial value. Our mortgage refinance calculator computes this equation instantly.
When Does Refinancing Make Financial Sense?
- Interest Rates Drop by 0.75% or More: Historically, reducing your contract rate by at least 75 to 100 basis points produces meaningful savings.
- Shortening Your Loan Horizon: Transitioning from a 30-year mortgage to a 15-year term drastically cuts lifetime compounding charges.
- Eliminating Private Mortgage Insurance (PMI): If your home equity has exceeded 20%, refinancing into a conventional mortgage can remove expensive monthly insurance premiums.
- Converting from ARM to Fixed: Switching from an Adjustable-Rate Mortgage to a stable fixed-rate product guarantees payment security. You can model base options using our Global Mortgage Loan Calculator.
Underwriting Fees & Consumer Guidance
Under disclosure regulations established by the Consumer Financial Protection Bureau (CFPB), lenders must deliver a Loan Estimate within three business days of application. Compare title insurance, origination points, and appraisal costs against the projections in this mortgage refinance calculator to ensure you receive favorable terms.
Frequently Asked Questions
What is a good break-even period for refinancing?
A break-even period under 24 to 36 months is generally considered excellent for homeowners planning to stay in their property medium to long term.
Can I roll closing costs into the new loan balance?
Yes. Many lenders offer "no-cost" or rolled-in refinancing, which finances closing costs into the loan balance in exchange for a slightly higher balance or interest rate.
Does refinancing reset my amortization term?
Yes, unless you choose a shorter term (like 15 or 20 years). If you are 5 years into a 30-year mortgage and refinance into a new 30-year term, your overall payoff timeline extends to 35 years.
How to use this calculator
Describe the loan you have and the loan you are considering. The calculator reduces the decision to two numbers: monthly savings and the breakeven horizon.
- Current loan balance. The payoff amount on your latest statement — not the original loan. Refinancing math runs on what you owe today.
- Current interest rate. Your existing note rate. Pull it from the note itself; many borrowers misremember it by a quarter point, which swings the savings materially.
- Remaining term. Years left on the current loan. This is the input most people get wrong: entering 30 when only 24 remain makes the refinance look better than it is, because it hides the amortization restart.
- New interest rate. The quoted or hypothetical replacement rate. Meaningful savings historically start around 0.75–1% below your current rate, though large balances can justify smaller improvements.
- New loan term. Usually 30 years, but test 20 or 15: a shorter term raises the payment while collapsing lifetime interest, and the calculator shows both effects.
- Closing costs. All-in settlement charges — origination, appraisal, title, prepaids — typically 2–5% of the loan. The Loan Estimate your lender must deliver within three business days of application itemizes every dollar.
Understanding your results
- Current Monthly Payment. Your existing P&I, recomputed from your inputs as a consistency check against your statement.
- New Monthly Payment. The proposed P&I at the new rate and term.
- Monthly Savings. The payment reduction — your monthly "gain," which only becomes real profit after closing costs are recovered.
- Break-Even Horizon. Closing costs ÷ monthly savings, in months. Under 24–36 months is generally excellent for homeowners staying put; beyond 48 months, weigh your moving plans carefully.
- Total Lifetime Interest Savings. Interest under the old loan minus interest under the new one, over the full terms. Read it net of closing costs, and remember it assumes you keep the loan to maturity — selling early forfeits the tail of the savings.
Worked example
A borrower owes $300,000 at 7.50% with 30 years left and is offered 6.25% for 30 years with $7,500 in closing costs:
- Current payment: $2,097.64/month
- New payment: $1,847.15/month
- Monthly savings: $250.49
- Breakeven: $7,500 ÷ $250.49 ≈ 30 months
- Lifetime interest — current: $455,152; new: $364,975
- Net lifetime benefit after closing costs: $82,677
The refinance pays for itself in two and a half years and nets over $80,000 across the full term — a clear win for anyone staying longer than the breakeven. If the same borrower instead chose a 15-year term at 5.75%, the payment would rise but lifetime interest would fall by roughly another $150,000: the classic payment-versus-wealth tradeoff the calculator lets you test.
Frequently asked questions
What credit score do I need to refinance?
Conventional rate-and-term refinances generally want 620+, with the best pricing reserved for 740+. FHA and VA streamline products are more forgiving — they exist precisely so borrowers can capture lower rates without a full credit re-underwrite. If your score has improved since you bought, that alone can justify running the numbers.
Can I refinance an FHA loan into a conventional loan?
Yes, and it is one of the highest-value refinances available: conventional loans drop mortgage insurance at 80% loan-to-value, while FHA mortgage insurance premium persists for the life of most FHA loans. Borrowers whose homes have appreciated into 20%+ equity often save twice — a lower rate plus no more MIP.
Should I refinance into a 15-year term?
If the higher payment fits comfortably — ideally under 28% of gross income — the 15-year term is a wealth-building machine: lower rates plus half the amortization years typically cut lifetime interest by 60–70%. The risk is liquidity: the higher payment is mandatory, unlike voluntary extra payments on a 30-year loan.
How soon after buying can I refinance?
For a conventional rate-and-term refinance, there is no mandatory waiting period — you can refinance the month after purchase if rates justify it. Cash-out refinances typically require six months of ownership (the "seasoning" period), and you will need a new appraisal reflecting any value change.
Does refinancing affect my property taxes?
No. Refinancing replaces the loan, not the ownership — your tax assessment, exemptions, and payment schedule are untouched. The only interaction is indirect: some borrowers escrow differently after refinancing, which changes the monthly impound amount but never the tax itself.
Fixed or ARM for a refinance — which should I choose?
Match the product to your horizon. Staying 7+ years: fixed rate, for payment certainty. Selling or expecting rates to fall within 5 years: a 5/1 or 7/1 ARM's lower initial rate can win — but model the worst-case adjusted payment, not just the teaser rate, before committing.