You could save $325.58 per month and $45,356.40 over the life of the loan.
Free Mortgage Refinance Calculator: Determine If Refinancing Pays Off
Everything you need to know
Share:
Comprehensive Guide to Mortgage Refinancing
Refinancing means replacing your current mortgage with a new loan, ideally with better terms. The primary goal is usually to lower your interest rate, reducing monthly payments and total interest paid. However, refinancing isn't free—closing costs typically run 2-5% of the loan amount ($4,000-$15,000 on a $300,000 mortgage). Understanding whether refinancing makes financial sense requires calculating the break-even point—when your monthly savings exceed your closing costs.
Refinancing can be transformative financially. A 1% rate drop on a $300,000 mortgage saves roughly $200/month and $70,000 over 30 years. But only if the closing costs are recovered through savings. The key question: "Will I stay in the home long enough for the monthly savings to exceed closing costs?" Answering this requires accurate math, not guessing.
How to Use the Refinance Calculator
Using our refinance calculator is straightforward:
Enter Current Loan Details
Current loan balance (not original amount)
Current interest rate
Years remaining on mortgage
Current monthly payment
Enter New Loan Terms
New interest rate (refinance offer)
New loan term (years)
Estimated closing costs
Any cash-out amount (if applicable)
View Comparison
New monthly payment
Monthly savings
Break-even point in months/years
Total lifetime savings (if keeping home)
Analyze Decision
If you'll stay past break-even: refinance makes sense
If you might move sooner: refinancing is risky
Consider other factors beyond pure math
Evaluate Trade-Offs
Shorter term = faster payoff but higher payment
Longer term = lower payment but more interest
Cash-out option = convenient but increases total debt
Break-even: Breaks even around year 3 as ARM increases
Decision: REFINANCE—trade small near-term increase for long-term rate certainty
Example 5: Cash-Out Refinance Trade-Off
Current Mortgage:
Balance: $200,000
Rate: 5%
Years remaining: 25
Monthly payment: $1,266
Cash-Out Refinance Offer:
New loan amount: $240,000 (taking out $40,000 cash)
New rate: 5.25% (slightly higher rate for cash)
New term: 25 years
Closing costs: $4,000
New Mortgage:
New payment: $1,419
Monthly increase: $153
Analysis:
You receive: $40,000 - $4,000 closing costs = $36,000 cash
For this cash, you pay extra $153/month × 300 months = $45,900 more total
Cost of $36,000 cash: $45,900 over 25 years
Equivalent to 4.3% cost of money
Use cases: Pay off higher-rate credit cards (18%+), or urgent needs
Decision: ONLY if using cash for something worth the 4.3% effective cost
Key Refinancing Concepts
The Break-Even Analysis
Most important calculation. If break-even > time you'll stay in home, don't refinance. If break-even < 30% of remaining loan term, usually safe to refinance (plenty of years for payoff).
Rate Lock Timing
Rates change daily. Lenders offer rate locks (typically 30-45 days free). Lock in when rates are attractive. Be prepared to close within lock period or rates might change.
No-Cost vs. Paid Refinances
No-cost refi: Lender covers closing costs, you get higher rate (usually 0.5% higher). Good for short-term planning.
Paid refi: You pay closing costs, you get better rate. Good for long-term planning.
ARM Adjustments
If on ARM (Adjustable Rate Mortgage), refinancing to fixed-rate when rates are reasonable locks in stability. ARMs reset quarterly/annually, creating payment uncertainty.
Opportunity Cost Consideration
Closing costs could be invested instead. $5,000 invested at 7% grows to $24,000 over 30 years. This is why break-even must be conservative—multiple years of savings needed to justify opportunity cost.
Disclaimer: This refinance calculator provides estimates based on typical scenarios. Actual refinancing terms, rates, and closing costs vary by lender, location, credit score, and loan type. Interest rates change daily. Always get formal Loan Estimates from lenders before making decisions. This calculator is for educational and planning purposes only—not financial advice.