Mortgage Refinance Calculator
Estimate your monthly savings, break-even period, and total interest impact from refinancing your mortgage. Compare your current loan with a refinanced loan side by side.
Current Mortgage
Refinance Loan
Results
Monthly Savings
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Remaining balance: current vs refinanced
Current vs Refinanced Loan
Side-by-side comparison of the two loans over their respective terms.
| Metric | Current Loan | Refinanced Loan |
|---|
Savings Breakdown
How the refinance pays back its upfront costs and where total savings come from.
| Item | Amount |
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Calculation Assumptions
- • Interest accrues monthly at the annual rate divided by 12; the EMI is calculated using standard amortization.
- • Monthly savings = current EMI − refinanced EMI. Negative values mean the new EMI is higher.
- • Break-even months = closing costs ÷ monthly savings. If closing costs are rolled into the loan, they are still treated as an upfront cost for break-even purposes.
- • Total interest savings = current loan total interest − refinanced loan total interest over their full terms.
- • If the new loan term exceeds the current remaining term, the borrower may pay more total interest even at a lower rate.
- • Taxes, insurance, HOA fees, and PMI are not modeled. Actual savings depend on lender terms, fees, and market rates.
Refinance projections are estimates based on the figures entered and stated assumptions. Actual savings may differ due to lender-specific terms, market rates, closing cost variations, taxes, insurance, and other factors. This calculator is for informational purposes only and is not financial or lending advice.
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Estimate Your Mortgage Refinance Savings
A Mortgage Refinance Calculator helps you compare your existing home loan with a potential replacement mortgage. Enter your current mortgage balance, interest rate, remaining term, new interest rate, proposed loan term, and estimated closing costs to evaluate how refinancing could affect your monthly payment and total borrowing cost.
Refinancing replaces your existing mortgage with a new loan. Depending on the terms, it may help reduce monthly payments, lower total interest, shorten the repayment period, or provide more predictable payments. The financial benefit depends on the new loan terms, refinancing costs, the time you expect to keep the mortgage, and whether your new repayment schedule extends your debt.
What Is Mortgage Refinancing?
Mortgage refinancing involves taking out a new mortgage to pay off an existing home loan. The replacement loan may have a different interest rate, repayment term, loan balance, or rate structure. Borrowers commonly consider refinancing when interest rates change, their financial circumstances improve, or they want to adjust the remaining repayment schedule.
A lower interest rate can reduce interest expenses, but refinancing is not automatically cheaper. Closing costs, a longer new term, financed fees, and changes in mortgage insurance can affect the overall result.
Reduce Monthly Costs
A lower rate or longer repayment term may reduce your required principal-and-interest payment, leaving more room in your monthly budget.
Reduce Borrowing Costs
Refinancing at a better rate or choosing a shorter repayment term may reduce the interest you pay over the remaining life of the loan.
Adjust Your Mortgage
You may switch between eligible fixed-rate and adjustable-rate options or explore cash-out refinancing, subject to lender approval.
Mortgage Refinance Calculator Formula
A standard fixed-rate mortgage payment is calculated using the loan principal, monthly interest rate, and total number of monthly payments. This formula can estimate the principal-and-interest payment on a proposed refinance loan.
M = Monthly principal-and-interest payment
P = New mortgage principal, including any fees financed into the loan
r = Monthly interest rate expressed as a decimal
n = Total number of monthly payments
For example, a 6% annual interest rate corresponds to a monthly rate of 0.005. A 25-year mortgage term contains 300 monthly payments. The calculation assumes a fully amortizing loan with a fixed rate and regular monthly payments.
Mortgage Refinance Break-Even Formula
The break-even point estimates how long it takes for monthly payment savings to recover the upfront refinancing costs.
Monthly payment savings = Current monthly payment − New monthly payment
This simple formula is appropriate when the new comparable payment is lower and the closing costs are known. It does not by itself measure every change in total interest, loan duration, or equity.
Important: Compare like-for-like payment amounts. Principal and interest are usually the clearest starting point because property taxes and homeowners insurance may continue separately and might not change as a result of refinancing. A full comparison should also account for mortgage insurance, financed fees, and changes in the loan term where relevant.
Mortgage Refinance Calculation Example
Suppose your current mortgage has a remaining principal balance of $250,000, an interest rate of 7%, and 25 years left to repay. You are considering refinancing the same principal balance at 6% with another 25-year term. Assume estimated closing costs of $6,000 are paid upfront rather than added to the new loan.
Using the fixed-rate mortgage payment formula, the estimated comparison is as follows.
| Mortgage Detail | Current Loan | Refinanced Loan |
|---|---|---|
| Principal balance | $250,000 | $250,000 |
| Annual interest rate | 7% | 6% |
| Remaining or new term | 25 years | 25 years |
| Monthly principal and interest | $1,766.95 | $1,610.75 |
| Estimated monthly savings | $156.19 | |
| Estimated closing costs | — | $6,000 |
| Estimated break-even period | — | About 39 months |
| Total future interest | About $280,084 | About $233,226 |
| Interest savings before costs | About $46,858 | |
In this simplified example, refinancing reduces the monthly principal-and-interest payment by approximately $156.19. The $6,000 closing cost is recovered through payment savings after roughly 39 months, and the estimated interest reduction over the full 25-year period is about $46,858 before closing costs.
These figures assume both loans run for the same remaining period, payments are made as scheduled, and the refinance uses the same principal balance. Taxes, insurance, mortgage insurance, tax effects, and any other fees are excluded. Actual savings will depend on the lender's offer, final loan balance, fees, and how long you keep the mortgage.
What Are Mortgage Refinance Closing Costs?
Closing costs are fees and other charges associated with completing a replacement mortgage. The amount depends on the lender, loan type, property, location, and terms. Some costs may be paid upfront, while others may be financed into the new loan or offset through lender credits.
| Cost | What It May Cover |
|---|---|
| Loan origination fees | Charges for processing, underwriting, or originating the replacement mortgage. |
| Appraisal fees | Property valuation required by the lender when applicable. |
| Title and settlement fees | Services associated with checking title, settlement, and other closing requirements. |
| Credit and verification fees | Costs for credit reports and other checks required during loan approval. |
| Discount points | Optional upfront charges that may reduce the mortgage interest rate. |
| Prepaid items and escrow | Applicable prepaid interest, taxes, insurance, or funding of escrow accounts. |
| Other lender or recording fees | Additional charges that apply to the specific transaction and jurisdiction. |
Review the lender's Loan Estimate and closing disclosures, where applicable, to identify the expected charges. A loan advertised as having no closing costs may still involve costs that are covered through a higher rate, lender credits, or an increased loan balance.
How to Use the Mortgage Refinance Calculator
Follow these steps to compare the cost of keeping your current mortgage with the cost of replacing it.
- Enter the current mortgage balance. Use the outstanding principal or payoff amount rather than the original amount borrowed. These figures may differ because of payments, accrued interest, or other payoff adjustments.
- Enter your current interest rate and remaining term. Use the rate and remaining payment schedule for your existing loan. Your original mortgage term may be longer than the remaining term today.
- Enter the proposed refinance rate. Use an estimated or quoted annual interest rate for the new loan, and distinguish fixed-rate offers from adjustable-rate offers.
- Select the new mortgage term. Compare an appropriate replacement term with the number of years remaining on your current mortgage.
- Add closing costs and any cash-out amount. Include fees paid upfront or indicate any costs financed into the new balance if your calculator supports that option.
- Review the results. Compare estimated payments, monthly savings, total interest, closing costs, and the break-even period where supported.
- Consider how long you will keep the loan. Compare your expected ownership or mortgage period with the estimated break-even time before deciding whether the transaction meets your goals.
Factors That Affect Mortgage Refinance Savings
The benefit of refinancing depends on more than the difference between two interest rates. The following factors can change the result substantially.
New Loan Rate
A lower rate generally reduces interest costs, but the actual benefit depends on the remaining balance, new term, and refinance fees.
Repayment Duration
A longer term may lower the monthly payment while increasing the time spent in debt and potentially increasing total interest.
Upfront Expenses
Fees reduce the net benefit of refinancing. Financing the costs means paying interest on those charges as well.
How Long You Stay
If you sell the property or refinance again before reaching break-even, you may not recover the cost through payment savings.
Fixed or Adjustable
Moving from an adjustable-rate loan to a fixed-rate loan may offer more predictable payments, although the cost and rate depend on the offer.
Home Value and LTV
Your equity and loan-to-value ratio can affect eligibility, pricing, and whether mortgage insurance is required.
Monthly Payment Savings vs. Total Interest Savings
A smaller monthly payment can make budgeting easier, but it does not automatically mean refinancing will reduce your total borrowing cost. If you restart your mortgage with a longer term, the payment may decrease partly because repayments are spread over more years rather than because the loan is substantially cheaper.
| Comparison | What It Tells You | Key Consideration |
|---|---|---|
| Monthly payment | How much your scheduled payment may change. | A lower payment can result from a longer term. |
| Break-even period | How long it takes for payment savings to equal closing costs. | It is a simplified measure, not a complete lifetime-cost comparison. |
| Remaining total interest | Interest expected under the current loan versus the replacement loan. | Compare the same future time horizon and the actual balances and terms. |
| Total refinance cost | Interest, closing costs, and other relevant transaction expenses. | Include costs financed in the new principal and any applicable mortgage insurance changes. |
| Equity repayment | How quickly principal is paid down under each loan. | A smaller payment may mean slower equity accumulation. |
Decision tip: Compare the remaining cost of your current mortgage with the cost of the proposed refinance over the period you actually expect to keep it. A break-even calculation is useful, but total interest, principal reduction, and closing costs provide a more complete picture.
When Does Refinancing Make Sense?
Refinancing may be worth evaluating when it supports a clear financial goal and the expected benefits justify the costs.
- Market rates have fallen. You may be able to replace a higher-rate mortgage with a lower-rate offer.
- Your credit or financial profile has improved. A stronger application may help you qualify for more favorable terms, depending on lender criteria.
- You want to shorten your mortgage term. A shorter loan may require higher monthly payments but can reduce the total interest paid over time.
- You need payment stability. Switching from an adjustable-rate mortgage to a suitable fixed-rate loan may make future principal-and-interest payments more predictable.
- You want to review mortgage insurance. Refinancing may change the mortgage insurance requirements or cost, depending on your equity, loan type, and lender rules.
- You plan to remain in the home beyond break-even. Keeping the loan long enough to recover the refinance costs can make payment savings more meaningful.
Cash-Out Refinance vs. Rate-and-Term Refinance
Not every refinance is intended to reduce the interest rate. The type of transaction affects the new loan balance and the way you should evaluate the results.
Change Your Loan Terms
This type of refinancing primarily replaces the existing mortgage with different interest-rate or repayment terms. The new balance may still change if eligible costs are financed.
Borrow Against Equity
A cash-out refinance creates a new mortgage larger than the amount required to pay off the old loan and eligible costs, providing cash to the borrower when approved.
Compare the Full Balance
Cash-out refinancing can increase debt, reduce home equity, and increase total interest. Evaluate the new balance and use of proceeds alongside the monthly payment.
If your objective is to reduce interest costs, do not compare a smaller current loan with a larger cash-out refinance as though the principal amounts are identical. Account for the additional borrowing and consider alternative ways to access funds.
Common Mortgage Refinancing Mistakes
- Looking only at the interest rate. Compare closing costs, loan term, payment structure, and other applicable charges as well.
- Using the original mortgage balance. The current outstanding balance or payoff amount is usually the appropriate starting point for comparing replacement financing.
- Ignoring a longer new term. Extending the repayment period can lower monthly payments while increasing the time required to become debt-free.
- Underestimating closing costs. Include lender charges, appraisal and title costs, points, and other applicable fees.
- Counting all payment reductions as savings. A smaller payment can reflect a term extension rather than a lower overall cost.
- Ignoring how long you plan to stay. Refinancing costs may not be recovered if you sell the property or refinance again too soon.
- Assuming taxes and insurance are included. Principal-and-interest estimates may exclude escrow payments, homeowners insurance, property taxes, and mortgage insurance.
- Assuming a calculator guarantees approval. The lender determines eligibility, final pricing, appraisal requirements, and approved loan terms.
Frequently Asked Questions
What is a Mortgage Refinance Calculator?
A Mortgage Refinance Calculator compares your existing mortgage with a proposed replacement loan. Depending on its features, it estimates the new principal-and-interest payment, monthly payment difference, closing costs, break-even period, and potential interest savings.
How do I calculate mortgage refinance break-even?
Divide the relevant refinancing closing costs by the positive monthly payment savings. For example, $6,000 in costs divided by $200 in monthly savings equals 30 months. This simplified approach assumes the payment comparison is appropriate and does not capture every difference in loan term, principal repayment, or lifetime cost.
How much does it cost to refinance a mortgage?
Refinancing costs vary with the lender, property, loan amount, location, and transaction details. Charges may include origination, appraisal, credit, title, settlement, recording, points, and prepaid items. Review your Loan Estimate and closing documents for the actual expected amounts.
Will refinancing always lower my monthly payment?
No. A lower interest rate or longer term may reduce the payment, but the result also depends on the new principal balance, the replacement term, mortgage insurance, and other loan conditions. A shorter-term loan or a cash-out refinance may increase the monthly payment.
Does refinancing save money if I choose a longer term?
It may reduce monthly payments, but a longer term can extend the time you carry the debt and increase total interest. Compare the new loan's total cost with the remaining cost of your current mortgage, including the fees and the principal repaid under each option.
Should I refinance if I plan to sell my home soon?
Refinancing may be less attractive if you expect to sell before recovering the closing costs through the relevant savings. Estimate your break-even period and consider your expected time in the home, remaining loan costs, and any other benefits that matter to your situation.
Are property taxes and homeowners insurance included in refinance payments?
Many mortgage calculators show principal and interest separately from property taxes, homeowners insurance, homeowners association fees, and mortgage insurance. Check which components your calculator includes. Some expenses may remain unchanged after refinancing, while others, such as mortgage insurance, can change depending on loan terms.
Can I include closing costs in my refinanced mortgage?
Depending on the lender and loan product, some costs may be financed into the new loan balance rather than paid entirely upfront. Financing fees does not make them disappear: it increases the principal and can result in additional interest over time.
What is the difference between a rate-and-term refinance and a cash-out refinance?
A rate-and-term refinance primarily changes the rate, term, or structure of your existing mortgage. A cash-out refinance lets an eligible borrower access some home equity by borrowing more than the amount required to pay off the existing mortgage and qualifying costs. Cash-out refinancing generally increases the new loan balance and reduces equity.
Can refinancing reduce total interest without lowering my payment?
Yes. Refinancing into a shorter term may increase your scheduled monthly payment while reducing the total interest paid over the repayment period. The exact result depends on your existing loan, new rate, remaining principal, transaction costs, and how long you keep the loan.
Does a refinance calculator guarantee my savings?
No. The result is an estimate based on the figures and assumptions entered. Final costs, interest rates, lender approval, closing requirements, and mortgage insurance may differ. Use a current lender quote and loan disclosures to verify your final comparison.