🏠 Refinance Calculator
Compare current vs. new loan — see monthly savings, break‑even point, and total lifetime interest change.
Loan Details
This amount will be added to new loan + closing costs. Equity must support it.
Current Mortgage
New Refinance Loan
Base amount (auto-updates for cash-out)
Closing Costs Breakdown
Total Closing Costs: $0
Property Tax & Insurance
Taxes & Insurance added to monthly payment for true PITI comparison.
💡 Tip: If taking cash-out, increase "New Loan Amount" accordingly. Calculator accounts for difference in payment & interest.
📊 Before vs. After Financial Summary
| Metric | Current | New Refinance | Difference |
|---|---|---|---|
| Monthly Payment (PITI) | $0 | $0 | $0 |
| Monthly Principal & Interest | $0 | $0 | $0 |
| Total Interest Over Life | $0 | $0 | $0 |
Current Monthly Payment
$0.00
Principal & Interest only
New Monthly Payment
$0.00
based on new loan terms
Monthly Savings / (Loss)
$0.00
Positive number means monthly cash flow improvement.
Break-even Period
— months
Months to recover closing costs via monthly savings
Total Interest Paid (Current Loan)
$0
Total Interest Paid (New Loan)
$0
Lifetime Interest Difference
$0
*Interest paid over full remaining term (current) vs new loan term. Negative diff = savings.
| Month | Current Balance | New Balance | Current Interest | New Interest |
|---|
Assumptions: fixed-rate mortgages, standard amortization. PITI includes taxes & insurance.
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Refinance Calculator Guide
How to use the calculator, why it matters, and real math examples
How to Use This Calculator
1 Enter Current Loan
Fill in your remaining balance, current interest rate, and years left on your existing mortgage.
2 Define New Loan
Add the new loan amount, proposed interest rate, and new term (e.g., 15 or 30 years).
3 Select Refinance Type
Choose Rate & Term (just lower rate) or Cash-Out (take equity out). The new loan amount auto-adjusts.
4 Itemize Closing Costs
Break down origination, appraisal, title, points and other fees. The tool totals them automatically.
5 Add Taxes & Insurance
Enter annual property taxes and homeowners insurance to see your true PITI (Principal, Interest, Taxes, Insurance) payment.
6 Click Calculate & Analyze
Instantly compare monthly payments, break-even period, total interest, and the 12-month amortization table. Look for the confidence badge (green/yellow/red) that tells you if refinancing makes sense.
Why Refinancing Math Matters
Refinancing replaces your existing mortgage with a new one. It can lower your monthly payment, reduce total interest, or free up cash — but it also costs money upfront (closing costs).
The most critical number is the break-even point: how many months it takes for your monthly savings to cover the closing costs. If you sell or move before breaking even, refinancing loses money.
This calculator also reveals a hidden trade‑off: lowering your payment by extending the term may increase total lifetime interest. The “Lifetime Interest Difference” shows you that clearly.
✅ Use this tool to avoid expensive mistakes and make data‑backed decisions.
Real Math Example
📌 Scenario: Rate Reduction
- Current loan: $250,000 at 5.5% with 22 years remaining
- New loan: $250,000 at 4.25% for 30 years
- Closing costs: $4,500
Step 1 – Monthly Payment (Current):
Using formula P = [P×r×(1+r)^n] / [(1+r)^n – 1]
r = 5.5% ÷ 12 = 0.0045833, n = 22×12 = 264 months
Current P&I = $1,634.62
Step 2 – Monthly Payment (New):
r = 4.25% ÷ 12 = 0.0035417, n = 30×12 = 360 months
New P&I = $1,230.09
Monthly savings = $1,634.62 – $1,230.09 = $404.53
Step 3 – Break-even Point:
Break-even (months) = Closing costs ÷ Monthly savings = $4,500 ÷ $404.53 ≈ 11.1 months
After 12 months, every payment is pure savings. If you stay in the home for 5+ years, refinancing is a great decision.
Step 4 – Lifetime Interest Comparison:
Current total interest = $181,540
New total interest = $195,444 (higher because term extended 8 years)
Even though monthly payment drops, total interest increases by $13,904 – a key insight this calculator makes clear.
Takeaway: Always check both short-term cash flow (monthly savings) AND long-term total interest. The calculator gives you both.
Frequently Asked Questions
When should I NOT refinance?
If your break-even point is longer than you plan to stay in the home, or if the new monthly payment actually increases (e.g., moving to a 15-year loan). Also avoid refinancing if rates have risen significantly.
Does the calculator include PMI (Private Mortgage Insurance)?
Not automatically, but you can add estimated PMI via “Other Fees” in the closing costs breakdown, or adjust the new loan amount to reflect higher LTV scenarios.
Is cash-out refinancing a good idea?
It depends. Use the cash for high-return investments, debt consolidation, or home improvements. The calculator automatically adds the cash-out amount to your new loan so you can see the true payment and interest cost.
How accurate is this tool?
It uses standard amortization formulas identical to those used by banks and lenders. Small differences (pennies) may occur due to rounding. For official loan estimates, always consult a mortgage professional.
What does the “Savings Confidence Badge” mean?
🟢 Good Deal – break-even under 24 months and lifetime interest savings. 🟡 Consider – positive savings but break-even 24–48 months. 🔴 Not Recommended – negative monthly savings or break-even beyond 5 years.
Can I see an amortization table?
Yes. Click “Show Amortization Comparison” to view the first 12 months of balances and interest for both loans side by side.
Pro Tip
Always run multiple scenarios. Try a 15-year term versus a 30-year term. Test what happens if rates drop another 0.5%. The calculator updates instantly when you change any input — use that to your advantage.
Click the button above to return to the top of the refinance calculator and adjust your numbers.
📚 Verified Sources & Industry Standards
This calculator is based on mortgage industry standards and official guidelines verified by these authoritative sources:
Break-Even Analysis Logic
Professional accounting standard: break-even period = total closing costs ÷ monthly payment savings. Closing costs rolled into new loan balance.
The CPA Journal: Refinancing Spreadsheet
Rate & Term vs. Cash-Out
Rate & Term refinance changes rates/terms. Cash-Out refinance accesses home equity. Closing costs range from 2% to 6% of loan value.
Freedom Mortgage: Refinance Comparison
PITI & Total Interest
Monthly payment includes Principal, Interest, Taxes, Insurance (PITI). Term extension lowers payment but may increase total interest.
Fannie Mae: Refinance Calculator Guide📊 Closing Cost Industry Standards:
Freedom Mortgage: 2% to 6% of loan value
Fincast (2026): 2% to 5% of new loan amount
Fannie Mae: 2% to 5% of the new loan
The CPA Journal: Costs rolled into new loan balance
📖 Fannie Mae Guidance on Refinancing Trade-Offs: "You may be able to build equity faster by refinancing with a shorter-term loan... Although your monthly payments may increase in this scenario, the total amount you'll pay over time will typically be lower because you'll be paying less interest overall. A cash-out refinance is likely to extend the time it takes to pay off your mortgage, and require you to pay more total interest — so consider carefully before pursuing this option."
Fannie Mae: Should You Refinance?📚 Academic Research Confirmation: The Financial Services Review (Fortin et al., 2007) confirms that refinancing break-even analysis "calculates the monthly payment on each of the loans and then iteratively performs a breakeven analysis"—the exact methodology powering this calculator.
Sources verified: June 2026 | Based on Fannie Mae guidelines, The CPA Journal methodology, and Freedom Mortgage industry standards | This calculator provides estimates only. Actual closing costs, rates, and terms vary by lender, location, and credit profile. Always consult a licensed mortgage professional.