Refinance Home Mortgage Calculator
Use this tool to compare your current mortgage with a refinance offer. It estimates payment changes, break-even timing, and long-term cost impact.
Estimates include principal and interest only (no taxes, insurance, HOA, or lender-specific fees).
How this refinance mortgage calculator helps
When homeowners think about refinancing, the first question is usually, “How much will I save each month?” That matters, but it is only one part of the decision. A refinance can reduce your payment, shorten your payoff timeline, or pull cash from home equity. It can also cost money upfront and reset your loan term, which may increase total interest if you are not careful.
This refinance home mortgage calculator is built to give you a clearer side-by-side comparison of your current loan and your potential new loan. It estimates:
- Your current monthly principal-and-interest payment
- Your estimated new monthly payment after refinancing
- Monthly savings (or increase)
- Break-even period based on closing costs
- Total remaining loan cost comparison
- Approximate loan balance after 5 years
Inputs you need before you calculate
1) Current loan balance
This is your remaining principal, not your original mortgage amount. You can find it on your latest mortgage statement or lender portal.
2) Current interest rate and remaining term
Enter the interest rate on your existing mortgage and how many years are left. These two numbers shape your current payment and your baseline for comparison.
3) Refinance rate and term
Use a realistic quote from a lender. You can test multiple scenarios, such as a 30-year refinance for lower payment or a 15- or 20-year refinance for faster payoff.
4) Closing costs and cash-out amount
Typical refinance closing costs often range from 2% to 5% of the loan amount, depending on location and lender fees. If you are doing a cash-out refinance, include the amount you plan to receive.
How to interpret the results
Monthly payment change
If your monthly payment drops, that improves short-term cash flow. But always check the total remaining cost too. A lower payment can still mean higher total cost if the new term is significantly longer.
Break-even period
Break-even answers: “How long do I need to keep this mortgage before savings cover the closing costs?” If you might move before break-even, refinancing may not be worth it.
Total remaining loan cost
This is often the most important long-range metric. It compares all remaining payments under your current loan versus the refinance option, including closing costs when paid out of pocket.
When refinancing often makes sense
- You can reduce your rate enough to create meaningful monthly and lifetime savings.
- You plan to stay in the home longer than the break-even period.
- You want to switch from an adjustable-rate mortgage (ARM) to a fixed-rate loan for stability.
- You want to drop mortgage insurance after sufficient equity growth (if lender guidelines allow).
- You can shorten your term (for example, 30 to 20 years) and still afford the payment.
When refinancing may not be the best move
- You expect to sell soon and probably will not reach break-even.
- Your new rate is only slightly better, but fees are high.
- You are extending your term too far, increasing total interest substantially.
- Your cash-out refinance adds debt for non-essential spending.
- Your credit profile worsened, leading to less favorable pricing.
Rate-and-term refinance vs cash-out refinance
Rate-and-term refinance
This replaces your existing mortgage with a new one mainly to improve the rate, payment, or term. It is generally the most cost-effective type of refinance if your goal is savings or payment strategy.
Cash-out refinance
This increases your loan balance so you can receive cash at closing. It can be useful for major home improvements, debt consolidation, or strategic financial goals—but only if the long-term cost is justified and the payment remains manageable.
Common refinance mistakes to avoid
- Focusing only on monthly payment and ignoring total interest cost
- Not comparing Loan Estimates from multiple lenders
- Overlooking lender credits, discount points, and prepaid items
- Choosing a longer term without a plan to make extra payments
- Skipping the break-even analysis
Simple decision checklist
Before you commit to refinancing, make sure you can answer “yes” to most of these:
- Does the refinance improve my monthly cash flow or reduce total cost in a meaningful way?
- Will I likely keep the home long enough to pass break-even?
- Have I compared at least 2–3 lender quotes?
- Do I understand whether closing costs are paid upfront or financed?
- Does this refinance align with my broader financial goals?
Final thought
A refinance can be a powerful financial move when the numbers and timeline work in your favor. Use the calculator above to test realistic scenarios, then validate your results with official lender disclosures. Even small differences in rate, fees, and term can change your outcome by thousands of dollars over time.