About Refinance Calculator
Refinancing a mortgage can lower your monthly payment, reduce the total interest you pay, or help you pay off your home faster. But refinancing is not free. Lenders charge closing costs that typically range from 2% to 5% of the loan amount, and those upfront fees must be recovered through monthly savings before the refinance truly pays off. That is why the break-even point is the most important number in any refinance decision. For example, refinancing a $250,000 remaining balance from 7% to 5.5% over 25 years can save roughly $250 per month, which means $4,000 in closing costs would be recovered in about 16 months. If you plan to sell the home before then, the refinance may actually cost you money. Your credit score, home equity, loan term, and how long you expect to stay in the home all influence whether a refinance makes sense. This calculator helps you compare your current mortgage against a new offer, estimate monthly savings, and find the break-even point so you can decide with confidence instead of chasing a lower rate blindly.
How It Works
Enter your current loan balance, current interest rate, the new interest rate you have been quoted, the remaining years on your loan, and the estimated closing costs. The calculator uses the standard amortization formula to compute your current monthly payment and your new monthly payment, then subtracts them to find monthly savings. It divides the closing costs by the monthly savings to estimate the break-even point in months. If the break-even period is longer than the time you plan to keep the home, the refinance is unlikely to be worthwhile. The calculator assumes a fixed-rate loan, the same remaining term, and no cash-out.
Formula & Calculation Logic
Monthly Payment M = P × [r(1+r)^n] / [(1+r)^n − 1], where P is the loan balance, r is the monthly interest rate (annual rate divided by 12), and n is the remaining number of months. Monthly Savings = Current Monthly Payment − New Monthly Payment. Break-Even Months = Closing Costs / Monthly Savings, rounded up to the next whole month. The formula assumes no change in loan term, a fixed interest rate, no cash taken out, and that closing costs are paid upfront rather than rolled into the loan.
Step-by-Step Guide
- Step 1: Gather your current mortgage statement to find the remaining balance and interest rate.
- Step 2: Request quotes from lenders for the new interest rate and closing costs.
- Step 3: Enter the remaining loan term in years.
- Step 4: Review the calculator's current and new monthly payment estimates.
- Step 5: Compare the break-even months to how long you expect to stay in the home.
Example Calculations
- Scenario 1: A $300,000 balance at 7% refinanced to 5.75% over 25 years with $4,500 in closing costs saves about $240 per month and breaks even in roughly 19 months.
- Scenario 2: A $200,000 balance at 6.5% refinanced to 6% over 20 years with $3,000 in closing costs saves about $60 per month and breaks even in roughly 50 months.
- Scenario 3: A $400,000 balance at 7.5% refinanced to 5.5% over 30 years with $5,000 in closing costs saves about $540 per month and breaks even in roughly 10 months.
Common Use Cases
- Taking advantage of a meaningful drop in market interest rates
- Refinancing after a major improvement in credit score
- Removing private mortgage insurance once equity reaches 20%
- Shortening the loan term to reduce total interest
- Cautiously consolidating higher-interest debt
Pro Tips
- Shop at least three lenders to compare both rates and fees.
- Consider a no-closing-cost refinance if you expect to move within a few years.
- Make sure the break-even point is shorter than your expected time in the home.
- Avoid extending the loan term unless you truly need lower monthly cash flow.
- Lock your rate once you decide, because markets can move quickly.
Common Mistakes to Avoid
- Ignoring closing costs when evaluating savings.
- Refinancing for a rate drop that is too small to justify the fees.
- Extending the loan term and paying more total interest over time.
- Comparing interest rates without looking at annual percentage rate.
- Cashing out equity to buy depreciating assets.
Why Use This Tool?
- Lower monthly payments to free up cash flow.
- Reduce the total interest paid over the life of the loan.
- Shorten the path to paying off your home.
- Potentially eliminate private mortgage insurance.