Mortgage Refinance Calculator
Should you refinance? See your monthly savings and break-even point.
How to Use This Calculator
Loan balance
Enter your current remaining balance — not the original loan amount. You can find this on your latest mortgage statement or online portal.
Current rate & new rate
Enter your current interest rate and the new rate you've been offered or expect to qualify for. The calculator instantly shows your new monthly payment, monthly savings, and total savings over the life of the loan.
More Options
Expand "More Options" to adjust the remaining term on your current mortgage, choose a new loan term (e.g., switch from 25 years remaining to a new 30-year or 15-year loan), and enter closing costs. Closing costs are subtracted from total savings and used to calculate your break-even point.
Share your result
Every input is encoded in the URL. Click Share, send the link — they'll see your exact numbers. No re-entering, no screenshots.
The Formula
Monthly mortgage payments use the standard annuity formula. The calculator computes both your current and new payment, then compares them.
where M = monthly payment, P = loan balance, r = monthly interest rate, n = number of payments
Key metrics
Break-even = Closing Costs ÷ Monthly Savings
Total Savings = (Old Total Payments) − (New Total Payments) − Closing Costs
Break-even tells you how many months it takes for the monthly savings to recoup your closing costs. Total savings is the net benefit over the full life of the new loan, after subtracting closing costs.
Example
Kevin — refinancing to a lower rate
Kevin has a $280,000 remaining balance at 7.5% with 25 years left. He's been offered 6.0% on a new 30-year loan with $3,000 in closing costs. Should he refinance?
Current mortgage
After refinancing
Kevin saves about $391 per month and recoups closing costs in under a year. Over the life of the loan, he saves roughly $57,000 — even after paying $3,000 in closing costs and extending his term by 5 years.