Free Refinance Calculator — Break-Even, Monthly Savings & Closing Costs

Best refinance calculator for break-even months and closing costs on US mortgages. Run scenarios in-browser. Try free—no signup.

Last updated 2026-05-28 · Davi Baptista

How it works

A refinance calculator compares your current loan payment and lifetime interest with a new rate and term, including break-even months after closing costs.

Our free refinance calculator (best refinance calculator for quick what-if math) compares your current mortgage or loan payment with a new rate and term. The refinance calculator totals lifetime interest, monthly savings, and break-even months after closing costs. Use this refinance calculator when market rates drop or your credit score improves—enter balance, current and new APR, years left, and fees. A free refinance calculator does not replace lender disclosures; it helps you ask better questions before you apply. Refinance calculator outputs pair with the student-loan and lease sections in our cluster guide.

When does refinancing pay off?

Refinancing makes sense when monthly payment savings and rate reduction outweigh closing costs before you move or pay off the loan. Break-even months = closing costs ÷ monthly savings — stay in the home at least that long for the refi to net out positive.

A lower rate with a longer term can cut your payment but increase lifetime interest. Compare total interest and break-even here, not just the new payment. Cash-out refinance adds lump-sum equity access but resets amortization on the full balance.

If you only need phased equity access rather than replacing the whole mortgage, model a HELOC draw period and repayment cliff on our HELOC payment calculator before you apply.

Guide, examples, and methodology

Best refinance calculator

A refinance calculator compares your current payment and remaining interest to a new rate, term, and closing costs. Break-even months ≈ closing costs ÷ monthly savings—stay past break-even for the refinance to net positive.

Refinance calculator

Rate-and-term refinance lowers APR on the existing balance. Cash-out refinance increases principal—compare total lifetime interest, not just the payment drop. Model HELOC draws separately if you only need phased equity access.

How to use this refinance calculator

Enter remaining loan balance, current rate and years left, then new rate, new term, and closing costs. Monthly savings = old payment minus new payment. Break-even months ≈ closing costs ÷ monthly savings. Stay in the home past break-even for the refinance to net positive before you sell or pay off early.

Example (USD)

Input	Value	Outcome
Balance	$320,000	—
Current	6.75%, 24 years left	$2,280/mo
New	5.50%, 30 years	$1,817/mo
Closing costs	$4,800	Break-even ≈ 9 months

When refinancing does not pay

You will move before break-even months elapse.
A lower rate with a longer term adds lifetime interest despite a smaller payment.
Cash-out refinance resets amortization on the full balance—you pay interest on equity you already built.
You skip comparing a HELOC if you only need phased equity access.

Next step

If you are weighing equity access instead of replacing the whole mortgage, model a HELOC draw period and repayment cliff on our HELOC payment calculator before you apply.

Rate-and-term vs cash-out refinance

Rate-and-term refinance replaces your existing balance at a new rate and term—ideal when you want lower payments or faster payoff without increasing principal. Cash-out refinance rolls equity into a larger loan and gives you cash at closing; break-even still matters, but you also pay interest on cash you already owned as home equity. Use this calculator for rate-and-term first, then layer cash-out amount only if you truly need lump-sum proceeds.

Lifetime interest vs monthly payment

A lower APR with a fresh 30-year term can cut your monthly bill while adding total interest versus keeping your remaining schedule. Always compare total interest paid under both scenarios, not just the payment delta. Homeowners who are 20 years into a 30-year loan sometimes refinance to 15 years at a modest rate drop and save six figures in interest—run both term options here before you lock.

Timing and rate locks in the US market

Mortgage rates move with Treasury yields and lender margins. Break-even assumes you close at the quoted rate—if rates rise before closing, savings shrink. Typical rate locks run 30–60 days; float-down options cost extra. If you plan to sell within three years, prioritize break-even under 24 months unless the refinance removes PMI or consolidates high-rate second liens.

Frequently asked questions

What is a good interest rate spread to justify refinancing?

Generally, an interest rate drop of 0.75% to 1% is sufficient to cover upfront costs if you plan to hold the property for at least 3 to 5 years.

How do closing costs affect my refinanced loan calculations?

Upfront fees directly impact your break-even point. Higher closing costs prolong the months required to recover your initial capital investment through monthly savings.

What is the best refinance calculator to use?

Use one that shows monthly payment, total interest, and break-even months on closing costs — not payment alone. Enter your current balance, rate, and remaining term plus the new offer.

How long to break even on a mortgage refinance?

Break-even months ≈ total closing costs ÷ monthly payment savings. If you sell before break-even, refinance may cost more net of fees.

Is it worth refinancing for 0.5% lower rate?

Depends on balance, years left, and fees. On a $300k loan with 25 years left, 0.5% can save meaningful interest — run break-even with your actual closing costs.

Free refinance calculator vs paid tools?

Free browser calculators are fine for payment and break-even estimates. Paid tools add rate shopping or lender APIs — start with break-even before shopping rates.