Mortgage Refinance Savings Calculator

Break-even: the only refinance rule that matters

Every refinance is a purchase — you’re buying a lower rate, and closing costs are the price. Break-evenis when the purchase pays for itself: closing costs divided by monthly savings. Save $210/month on $6,300 of costs and you break even at month 30 — keep the home past that and every month is profit; sell or refinance again before it and you paid fees for nothing. That’s why the honest question isn’t “did rates drop enough?” but “will I still be in this loan when it starts paying me back?”

The term-reset trap

Here’s the math most refinance ads skip: if you’re six years into a 30-year loan and refinance into a fresh 30, you’ve turned 24 remaining years into 30 — and those six years of interest you already paid don’t come back. The payment drops, the total often rises. This calculator shows the lifetime figure next to the monthly one for exactly this reason, and it will tell you plainly when a lower payment costs more. The workaround if cash flow allows: refinance into the shorter term, or take the long term and voluntarily pay the shorter-term amount.

Why your DTI decides more than the rate does

Mortgage underwriting weighs both credit and debt-to-income — a strong score with a stretched DTI still hits program ceilings (commonly around 45–50% back-end). The refinance itself moves your DTI only as much as the payment changes; the bigger lever is usually the otherdebt payments in the numerator. That’s the quiet connection between refinancing and debt relief: consolidating or resolving unsecured balances first can drop your DTI enough to unlock the refinance — and the better pricing — that was out of reach. The options panel above surfaces those paths only when your numbers actually fit them.

Equity, LTV, and the 80% line

Loan-to-value is your balance divided by your home’s value, and 80% is the line where conventional loans typically shed PMI and pricing improves. If values in your area have climbed since you bought, your LTV may have improved without you doing anything — occasionally enough that a refinance (or even just a PMI removal request on your current loan) captures savings this tool’s payment math alone won’t show. Above 97%, and especially above 100%, standard refinancing narrows sharply until equity recovers — a waiting game, not a dead end.

Authoritative references

The CFPB’s Owning a Home resource center explains Loan Estimates and how to comparison-shop lenders line by line. For where rates actually are this week, Freddie Mac’s Primary Mortgage Market Survey is the industry benchmark. And because DTI is half the approval story, the CFPB’s debt-to-income explainer covers what counts in the ratio lenders apply to your file.