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Mortgage Refinance Calculator

Analyze home mortgage refinance: monthly savings, break-even point, closing costs, and total interest saved. Built for remaining balance, rate, and years left on your home loan.

US Home Mortgage Refinance — Rate, Term, and Break-Even

BrainyCalculators editorial insight — unique to this tool

US homeowners refinance when the 30-year fixed rate falls meaningfully below their current note — 2020–2021 saw millions reset from 4%+ to sub-3% rates. This tool compares remaining balance payoffs against new rate/term, factoring closing costs (appraisal, title, origination) typically 2–5% of loan amount. Cash-out refinance raises principal to extract home equity for renovations or debt consolidation.

When to use this calculator

Use specifically for residential mortgage refinance with break-even and interest-saved analysis. For auto loans or generic debt swap, use Refinance.

Reference Value Context
30-yr fixed (historical low) ~2.65% Jan 2021
Closing cost range 2–5% Of loan amount
Break-even target < 36 months Common guideline
Cash-out LTV cap ~80% Most lenders

Not what you need? For auto or personal loan refinance, use Refinance. For first-time affordability, use House Affordability.

Refinancing an auto or personal loan?

This calculator is optimised for home mortgage refinancing with closing costs and equity considerations. For a general loan refinance comparison (auto, personal, or other), use our General Refinance Calculator →

Current Loan

New Loan

Mortgage Refinance: Home Loan Break-Even Analysis

Mortgage refinancing pays off your existing home loan with a new one — to capture a lower rate, remove PMI, shorten amortisation, or access equity. Housing math must include closing costs (typically 2–5% of loan amount) and how long you expect to keep the home.

This page models remaining balance, current and new rates, term in years, and optional payment verification — the fields on a Loan Estimate. Break-even months = closing costs ÷ monthly savings; refinancing only pays if you stay past that horizon.

Auto, personal, and student refis skip appraisal, title, and property tax escrow. For those shorter-term loans, use the General Refinance Calculator instead of home-loan assumptions.

Refinance Formulas

Monthly Payment = P × [r(1+r)^n] ÷ [(1+r)^n − 1]
Monthly Savings = Old Payment − New Payment
Break-even (months) = Closing Costs ÷ Monthly Savings
Total Savings = Old Interest − New Interest − Closing Costs

Where P = principal, r = monthly rate (annual rate ÷ 12), n = total payments (years × 12). The break-even point is the number of months you must stay in the home for refinancing to be worthwhile.

How to Use the Mortgage Refinance Calculator

  1. 1
    Enter Current Loan Details
    Input your remaining loan balance, current interest rate, and years left on the mortgage. Your current monthly payment is optional — it will be auto-calculated from the balance and rate if left blank.
  2. 2
    Enter New Loan Terms
    Enter the new interest rate and loan term you have been offered. Include estimated closing costs, which typically range from 2–5% of the loan amount.
  3. 3
    Review Monthly Savings
    See how much less you will pay each month with the new loan. A positive number means refinancing lowers your payment.
  4. 4
    Check the Break-even Point
    The break-even point shows how many months until the cumulative savings exceed your closing costs. If you plan to stay in the home longer than this, refinancing likely makes financial sense.

Example Calculation

Balance $280,000, current rate 7.5%, 25 yrs remaining → refinance to 6.25%, 30 yrs, closing costs $5,000:

Old payment = $280,000 × [0.625%(1.00625)^300] ÷ [(1.00625)^300−1] ≈ $2,062/mo
New payment = $280,000 × [0.521%(1.00521)^360] ÷ [(1.00521)^360−1] ≈ $1,724/mo
Monthly savings = $2,062 − $1,724 = $338/mo
Break-even = $5,000 ÷ $338 ≈ 15 months

How the Mortgage Refinance Calculator Works

Formula, assumptions, and calculation steps for this real estate tool.

Methodology

Real-estate calculators combine property price, income, rent, tax, mortgage, or expense inputs into affordability and return estimates.

Calculation Steps

  1. Enter property, income, payment, or rent assumptions.
  2. Convert annual values to monthly values where needed.
  3. Apply affordability, yield, tax, or loan formulas.
  4. Show the result with ratios or payment context.

Assumptions and Limits

  • Market rents, taxes, insurance, and rates can change by location.
  • Closing costs and local regulations are included only if provided.
  • Use a real-estate or lending professional for binding decisions.

Frequently Asked Questions

Strong candidates can lower rate by roughly 0.5–1%, plan to stay past the break-even month, improved credit, or need to drop PMI after appreciation.

Budget 2–5% of the loan amount for origination, appraisal, title, recording, and prepaid taxes or insurance. No-closing-cost offers usually hide fees in a higher rate.

If you refinance 22 years remaining into a new 30-year loan, payments fall but total interest may rise. Compare lifetime interest, not just the monthly cheque.

Cash-out replaces the entire mortgage with a larger balance at mortgage rates. A HELOC is a separate line with variable draws. Tax and payment structure differ materially.

Real-World Applications

🏠
Rate-and-Term After Fed Cuts
Quantify monthly savings when market mortgage rates fall below your locked pandemic-era note.
📉
PMI Removal Refi
Use a new appraisal to show 20% equity and eliminate insurance premiums even if the rate barely moves.
💵
Cash-Out for Renovation
Compare mortgage-rate cash-out funding against HELOC or personal loan alternatives for a kitchen project.
⏱️
15-Year Acceleration
Trade a modest payment increase for retiring the note before retirement cash-flow needs tighten.
🔄
ARM Reset Protection
Lock a fixed rate before an adjustable loan reprices higher in a rising-rate environment.
🏦
Lender Offer Normalisation
Line up Loan Estimates with different point structures by converting each to the same break-even horizon.

Mortgage Refinance Mistakes to Avoid

1
Comparing only monthly payment
A lower payment with a restarted 30-year term can cost more lifetime interest than keeping the old note.
2
Underestimating prepaids and escrows
Prepaid property tax and insurance reserves inflate cash to close and extend the true break-even period.
3
Refinancing shortly before a move
Selling before the break-even month turns closing costs into a net loss even with a great rate quote.
4
Cash-out without a debt discipline plan
Paying off cards with home equity helps only if new card balances do not return immediately.
5
Using auto-loan refinance logic on a mortgage
Cars do not need appraisals or title policies. Housing refis require property-specific fees modeled on this page.

Refinance Break-Even Scenarios ($300K balance, $5K closing costs)

Rate Reduction ~Monthly Saving Break-Even (months)
0.25% ~$45 ~111 months (9 yrs)
0.50% ~$90 ~56 months (4.7 yrs)
0.75% ~$135 ~37 months (3.1 yrs)
1.00% ~$180 ~28 months (2.3 yrs)
1.50% ~$270 ~19 months (1.6 yrs)
2.00% ~$360 ~14 months (1.2 yrs)

References

  1. CFPB. When Does Refinancing Make Sense? Consumer Financial Protection Bureau, 2024.
  2. Freddie Mac. Primary Mortgage Market Survey. Freddie Mac, 2024.
  3. Brueggeman, W.B. and Fisher, J.D. Real Estate Finance and Investments. McGraw-Hill, 2019.
  4. Fabozzi, F.J. The Handbook of Mortgage-Backed Securities. Oxford University Press, 2016.
  5. Federal Reserve. Consumer Credit — G.19 and Mortgage Finance Data. Federal Reserve, 2024.

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