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Calculate your monthly savings, closing cost break-even point, and overall interest reduction when refinancing your mortgage.
The Mortgage Refinance Calculator analyzes whether refinancing your home loan makes financial sense. It evaluates your current monthly payment against new interest rate offers, loan terms, and closing costs to calculate your monthly cash savings, break-even timeline, and total lifetime interest reduction.
Worked Examples (Calculated Directly by the Refinancing Engine): 1. Cash Flow Relief (Lower Rate & Reset Term to 30 Years): • Remaining Principal Balance: $350,000 | 25 Years Remaining • Current Loan: 7.0% APR = $2,473.73/month (Remaining Interest: $392,118) • New Refinanced Loan: 5.5% APR, 30-Year Term = $1,987.26/month (New Total Interest: $365,414) • Monthly Cash Flow Savings: $2,473.73 − $1,987.26 = $486.47/month • Closing Costs: $6,000 (origination, appraisal, title, escrow) • Break-Even Timeline: $6,000 ÷ $486.47 = 12.3 months (roughly 1 year and 1 month) • Net Lifetime Savings: ($2,473.73 × 300) − ($1,987.26 × 360) − $6,000 = $20,704 net savings. 2. Term Compression (Refinancing 26 Years Left into a 15-Year Mortgage): • Remaining Principal Balance: $400,000 | 26 Years Remaining • Current Loan: 6.75% APR = $2,723.18/month (Remaining Interest: $449,632) • New Refinanced Loan: 5.0% APR, 15-Year Term = $3,163.17/month (New Total Interest: $169,371) • Monthly Cash Flow Difference: +$439.99/month (Monthly payment increases by ~$440) • Closing Costs: $5,000 upfront • Lifetime Interest Reduction: $449,632 − $169,371 = $280,261 gross interest saved! • Net Lifetime Savings: ($2,723.18 × 312) − ($3,163.17 × 180) − $5,000 = $275,260 net savings, cutting 11 years of mortgage debt. 3. Rate Drop with Same Horizon (20 Years Remaining to 20-Year Term): • Remaining Principal Balance: $280,000 | 20 Years Remaining • Current Loan: 6.5% APR = $2,087.60/month (Remaining Interest: $221,025) • New Refinanced Loan: 5.25% APR, 20-Year Term = $1,886.76/month (New Total Interest: $172,823) • Monthly Cash Flow Savings: $2,087.60 − $1,886.76 = $200.84/month • Closing Costs: $4,500 upfront • Break-Even Timeline: $4,500 ÷ $200.84 = 22.4 months (under 2 years) • Net Lifetime Savings: ($2,087.60 × 240) − ($1,886.76 × 240) − $4,500 = $43,702 in net interest reduction.
If you plan to stay in your home past the break-even date (12.3 months in Scenario 1, 22.4 months in Scenario 3), refinancing is financially beneficial. Be cautious when resetting an older loan to a brand-new 30-year term: while your monthly payment drops, stretching repayments over 360 new months can dilute lifetime interest savings unless you refinance into a shorter term (like Scenario 2).
The break-even point is the time required for monthly payment savings to equal the upfront closing costs. Most homeowners aim for a break-even window of 24 to 36 months or less. If you plan to sell or move before reaching the break-even date, refinancing will cost you more than staying in your current loan.
Refinance closing costs typically range between 2% and 5% of the loan amount ($4,000 to $10,000 on a $300,000 mortgage). Typical line items include lender origination fees (0.5%–1%), home appraisal ($500–$800), title insurance search and policy ($1,000–$2,000), recording fees, and prepaid property tax/homeowners insurance escrows.
There is no such thing as truly free refinancing. In a 'no-closing-cost' refinance, the lender either rolls the closing costs into your total loan balance (increasing the principal you pay interest on) or charges a slightly higher interest rate (e.g., 5.875% instead of 5.50%) and uses lender credits to cover the fees.
A rate-and-term refinance simply modifies your interest rate and repayment period without altering the loan balance (aside from rolling in fees). A cash-out refinance replaces your current mortgage with a larger loan, allowing you to withdraw accumulated home equity as a lump sum in cash.
A traditional rule of thumb is that a 1.0% interest rate reduction makes refinancing worthwhile. However, on larger mortgage balances ($400,000+), even a 0.50% to 0.75% rate reduction can produce enough monthly savings to break even in under two years.
Data verified: September 2026