Mortgage Refinance Calculator
Compare your current loan to a potential refinance and estimate monthly savings, total interest impact, and break-even timing.
Why use a refinance calculator?
A refinance sounds simple: get a lower rate, lower your payment, move on. In reality, refinancing can affect your finances in several ways at once. Your monthly payment might drop, but your total interest could still increase if you reset the loan term. Closing costs can also eat into your gains for years.
This refinance calculator helps you quickly compare your current mortgage against a proposed new mortgage by focusing on practical decision points:
- How much your monthly payment may change
- How much total remaining interest you may save or add
- How long it could take to recover closing costs (break-even point)
- How rolling costs into the loan changes your new principal
What the calculator includes
Current loan snapshot
You enter your current loan balance, current interest rate, and remaining term. This estimates what your loan costs if you do nothing.
New refinance scenario
You enter a new rate and term, then add closing costs and optional cash-out. The calculator assumes closing costs and cash-out are financed into the new loan amount.
Side-by-side comparison
You get a direct comparison of payment and interest, plus a break-even estimate based on closing costs and monthly savings.
How to interpret your results
Monthly savings is only the first checkpoint
A lower monthly payment is helpful, especially if your budget is tight. But it does not automatically mean the refinance is better over the long run. Always pair monthly savings with total interest impact.
Break-even matters if you might move soon
If the break-even point is 48 months and you expect to sell in 24 months, refinancing may not be worth it. If you plan to stay for 10+ years, the same refinance could be a strong move.
Longer terms can lower payment but increase total cost
Resetting to a new 30-year term can reduce payment significantly, but it may extend debt and increase total interest paid. Consider comparing multiple term lengths (15, 20, 25, 30 years).
When refinancing often makes sense
- You can meaningfully lower your interest rate
- You plan to keep the home past your break-even timeline
- You want to switch from adjustable-rate to fixed-rate stability
- You need to improve monthly cash flow responsibly
- You can avoid excessive lender fees and points
When to be careful
- High closing costs wipe out expected savings
- You extend the term too much and increase lifetime interest
- You plan to move before break-even
- You take large cash-out for non-essential spending
- You refinance repeatedly and keep restarting the clock
Practical tips before locking a refinance
Compare at least 3 lenders
Rates, fees, and credits vary widely. A slightly lower rate with higher fees can be worse than a marginally higher rate with low costs.
Ask for APR and fee breakdown
APR helps account for cost, but also review the full loan estimate so you understand points, title fees, and lender charges.
Run multiple scenarios
Try different terms and costs in this calculator. For many homeowners, a 20-year option can balance payment comfort and long-term savings better than a full reset to 30 years.
Check credit timing
If your credit score is about to improve, waiting a little could qualify you for significantly better pricing.
Bottom line
A refinance is not just a rate decision; it is a timeline and cost decision. Use the calculator above to evaluate payment, interest, and break-even together. The best refinance is the one that aligns with your actual plans for the home, your budget, and your long-term financial goals.
Educational note: This tool provides estimates only and does not include taxes, insurance, PMI changes, or lender-specific underwriting rules.