Refinance Calculator [2026]
Compare your existing loan against a new refinance rate. Calculate monthly cash flow savings, lifetime interest reduction, closing cost breakeven horizon, and net financial gain.
Refinance Economics & Breakeven Formula
Refinancing replaces an existing debt obligation with a new loan under updated interest rates and repayment terms. A refinance is commercially viable when the monthly cash flow savings recover all upfront closing fees well before you plan to sell or pay off the asset.
$4,000 closing costs ÷ $200/mo savings = 20 months to breakeven.
Reveals whether lowering monthly payments inadvertently increases lifetime interest via longer terms.
Financial advisors generally recommend refinancing when prevailing market rates drop by at least 0.75% to 1.0% below your current loan APR.
1. Current Existing LoanCurrent obligations
2. New Proposed Refinance LoanNew quoted terms
Drops payment from $2,023.86 to $1,634/mo
Time to recover $4,500 in closing fees through monthly cash savings.
This refinance saves you $389.86/month and breaks even in 12 months, creating $14,416.33 in net wealth after closing fees!
Current Loan vs. Refinanced Loan Breakdown
| Financial Metric | Current Loan | New Refinanced Loan | Refinance Difference |
|---|---|---|---|
| Interest Rate (APR) | 7.25% | 5.75% | 1.50% Rate Drop |
| Monthly Payment | $2,023.86 | $1,634 | $389.86 / mo |
| Remaining Term | 300 months | 360 months | +60 mo added |
| Lifetime Interest | $327,157.77 | $308,241.44 | $18,916.33 saved |
| Closing Fees Paid | $0 | $4,500 | Upfront cost |
Frequently Asked Questions About Loan Refinancing
How do I calculate if refinancing is worth it?↓
Refinancing is typically worth it if: 1) The interest rate drops by at least 0.75% to 1.0%, 2) You plan to stay in the property or keep the loan longer than the breakeven period (Total Closing Costs ÷ Monthly Savings), and 3) The net lifetime interest on the new loan is lower than the remaining interest on your existing loan.
What is a refinance breakeven point?↓
The breakeven point is the exact number of months it takes for your cumulative monthly payment savings to equal the upfront closing costs paid to refinance. For example, if refinancing costs $4,000 in closing fees and saves you $200 per month, your breakeven point is 20 months ($4,000 ÷ $200). If you hold the loan past month 20, you generate pure financial profit.
What are typical closing costs when refinancing a mortgage?↓
Mortgage refinance closing costs generally range between 2% and 5% of the loan principal. On a $300,000 loan, closing costs typically total $6,000 to $12,000, which includes appraisal fees, origination charges, title insurance, and lender fees.
Can refinancing extend my loan term and cost more in the long run?↓
Yes. If you have already paid 10 years of a 30-year mortgage (with 20 years remaining) and refinance into a brand-new 30-year loan, your monthly payment will drop, but you are stretching debt payments over 40 total years. You may end up paying more total interest despite a lower interest rate unless you refinance into a shorter 15-year or 20-year term.
Authored by Arham Bilal
Formulas calibrated against CFPB mortgage disclosure guidelines, Fannie Mae / Freddie Mac refinance guidelines, and institutional breakeven mathematical models.
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