Mortgage Refinance Calculator — Break-Even & Savings
Calculate your monthly savings, break-even month, and cumulative net savings from refinancing. Supports rate-term and cash-out refinancing with closing cost analysis.
Quick Scenarios
Current Loan
25.0 years remaining
New Loan
What Is the Mortgage Refinance Calculator — Break-Even & Savings?
Refinancing replaces your existing mortgage with a new one — ideally at a lower rate, shorter term, or both. The core math question is whether the monthly savings justify the upfront closing costs within your planned holding period.
- ›Break-even month — The month at which cumulative savings exceed total closing costs. If you plan to sell before break-even, refinancing costs you money.
- ›Rate-term refi — Changes your rate and/or term without pulling cash out. Lower risk, lower closing costs, easiest to qualify for.
- ›Cash-out refi — You borrow more than you owe, taking the difference as cash. Resets your loan term. Higher rate premium and closing costs than rate-term.
- ›Term shortening — Refinancing from a 30-year to a 15-year loan typically raises your monthly payment but dramatically reduces total interest paid. The rate is also usually lower on shorter terms.
Formula
New Monthly Payment
M = P × r(1+r)ⁿ / ((1+r)ⁿ − 1) where P = remaining balance, n = new term in months
Monthly Savings
Savings = Old Payment − New Payment
Break-Even Month
Break-Even = Closing Costs / Monthly Savings
Net Cumulative Savings (Year N)
Net = (Monthly Savings × 12N) − Closing Costs
| Rule of Thumb | Guideline |
|---|---|
| Rate drop needed | ≥ 0.5% to 1% for standard refi to make sense |
| Break-even period | Under 24–36 months if you plan to stay |
| Closing costs | 2–5% of loan amount (avg ~$5,000 for $300k loan) |
| Cash-out rate premium | Typically 0.125–0.5% higher than rate-term refi |
How to Use
- 1Enter current loan details: Input your current balance, interest rate, and remaining months. These determine your existing monthly payment.
- 2Enter new loan terms: Set the rate you've been offered and the new term in years. A lower rate or shorter term reduces interest cost.
- 3Enter closing costs: Typical closing costs are 2–5% of the loan amount. Check your Loan Estimate for exact figures.
- 4Add cash-out amount (optional): If taking cash out, enter the amount. It will be added to the new principal.
- 5Review break-even month: If you plan to stay past this month, refinancing is net positive. If you'll move sooner, it may not be worth it.
- 6Check cumulative savings table: See year-by-year net savings after recovering closing costs. Helps visualize the long-term benefit.
Example Calculation
$320,000 balance at 7.5% → refi to 6.5%, 30-yr, $6,000 closing costs
Current payment (7.5%, 25yr rem): $2,362/mo
New payment (6.5%, 30-yr): $2,023/mo
Monthly savings: $339/mo
Break-even: $6,000 ÷ $339 = 17.7 months
Year 1 net: $339 × 12 − $6,000 = −$1,932 (not recovered yet)
Year 2 net: $339 × 24 − $6,000 = +$2,136 (break-even hit)
Year 5 net: $339 × 60 − $6,000 = +$14,340
Year 10 net: $339 × 120 − $6,000 = +$34,680
One tradeoff: resetting the clock
Refinancing to a new 30-year term means you restart the amortization schedule. Even at a lower rate, you may pay more total interest if you extend the remaining term significantly. Compare not just monthly payment but also total interest remaining on both scenarios.
Understanding Mortgage Refinance — Break-Even & Savings
When Refinancing Makes Sense
The traditional rule of thumb is to refinance when you can lower your rate by at least 1%. However, a 0.5% drop on a large balance can also be worth it. The actual test is whether monthly savings × months remaining in the home exceed closing costs. A $300 monthly savings and $5,000 in closing costs means you need 17 months just to break even — not including opportunity cost of the closing cost dollars.
The Opportunity Cost of Closing Costs
Closing costs paid upfront could instead be invested. At 7% market returns, $6,000 in closing costs compounds to approximately $7,700 in 3 years and $11,800 in 10 years. A true break-even analysis includes this opportunity cost — not just the nominal recovery month. This calculator shows the simpler nominal break-even, which is what most lenders quote.
No-Cost Refinancing
Lenders sometimes offer no-closing-cost refinancing in exchange for a slightly higher rate (typically 0.125–0.375% higher). This eliminates the break-even problem at the cost of a permanently higher rate. No-cost refi can make sense if you plan to move within 3–5 years or if you may refinance again when rates drop further.
- ›Lender credits offset closing costs but raise your rate by roughly 0.125–0.375%.
- ›Zero-cost refi makes sense for short holding periods or when rates may fall further.
- ›Rolling closing costs into the loan avoids upfront cash but increases principal and total interest.
Legal Disclaimer
This calculator provides estimates for comparison purposes only. Actual refinance eligibility, rates, closing costs, and break-even timing depend on your credit score, equity, debt-to-income ratio, loan type, and lender. Consult a licensed mortgage professional. See CFPB refinancing guidance and Freddie Mac PMMS for current rate benchmarks.
Frequently Asked Questions
How do I know if refinancing is worth it?
The core test: will you stay in the home long enough for cumulative savings to exceed closing costs?
- ›Calculate break-even month: total closing costs ÷ monthly payment savings.
- ›If you plan to move before break-even, refinancing costs you money net-net.
- ›Also check whether extending the term resets your amortization clock and increases total interest paid.
- ›A 1% rate drop on a $400k loan saves ~$240/mo — with $6,000 in closing costs, break-even is 25 months.
Refinancing is worth it when: rate drop ≥ 0.5–1%, you plan to stay past break-even, and you're not resetting a nearly-paid-off loan to a new 30-year term.
What are typical mortgage refinance closing costs?
Closing costs typically range from 2–5% of the loan amount (~$5,000–$10,000 on a $300,000 loan). Key line items:
- ›Origination fee: 0.5–1% of loan amount — the lender's primary profit center; often negotiable.
- ›Appraisal: $400–$600; required unless waived by lender (desktop or waived appraisal programs exist).
- ›Title insurance: $1,000–$2,000; required to protect against prior title claims.
- ›Recording fees and taxes: $100–$500 depending on state and county.
Always request a Loan Estimate within 3 business days of applying — it standardizes fees so you can compare lenders on equal terms.
What is a cash-out refinance and when does it make sense?
A cash-out refi replaces your mortgage with a larger loan; you receive the difference as cash. Common uses and considerations:
- ›Home improvements: can increase property value; ROI varies significantly by project type.
- ›Debt consolidation: converts high-rate unsecured debt to low-rate secured debt — but your home is now the collateral.
- ›Rate premium: cash-out refis typically carry a 0.125–0.5% higher rate than rate-term refis.
- ›Risk: you're increasing the balance secured by your home and resetting the amortization clock.
Cash-out refinancing makes sense when the rate saved (vs. alternatives like HELOC or personal loan) outweighs the higher rate premium and resetting the loan term.
Does refinancing hurt my credit score?
Yes, temporarily — but the impact is modest and short-lived if you pay on time.
- ›Hard inquiry: typically −5 to −10 points; recovers within 3–6 months.
- ›New account: lowers average account age — more impact for newer credit files than established ones.
- ›Rate shopping protection: multiple mortgage inquiries within 45 days count as a single inquiry in FICO 8+.
- ›On-time payment history: the new account becomes a positive factor within 12–24 months.
If your score is borderline for the best rate tier, check it before applying and consider whether improving it first would save more than waiting.
Should I shorten my term when refinancing?
Shortening from 30-year to 15-year raises your monthly payment but dramatically reduces total interest cost.
- ›Rate advantage: 15-year rates are typically 0.5–0.75% lower than 30-year rates.
- ›Interest savings: on a $300,000 loan, total interest over 15 years vs 30 years can differ by $150,000+.
- ›Payment impact: monthly P&I is higher — on $300k, roughly $500–$700/mo more than the 30-year equivalent.
- ›Tradeoff: higher required payment reduces financial flexibility and cash flow buffer.
The 15-year term works best when you can comfortably handle the higher payment and want to eliminate the mortgage before retirement.