How to Use the Mortgage Refinance Calculator
This mortgage refinance calculator helps you decide whether refinancing your home loan makes financial sense. Enter your current interest rate, remaining loan balance, remaining term, and the new rate and term you're considering. Then add your estimated closing costs (typically 2-5% of the loan amount) to see a complete cost-benefit analysis.
The calculator shows your monthly payment comparison, monthly savings, break-even point (how many months to recoup closing costs), total interest saved over the loan term, and your loan-to-value (LTV) ratio — which determines whether you qualify for conventional refinancing.
Mortgage Refinance Formula & Methodology
Monthly Payment Calculation
Both current and new payments use the standard amortization formula: M = P × [r(1+r)ⁿ] ÷ [(1+r)ⁿ − 1], where M is the monthly payment, P is the loan balance, r is the monthly interest rate (APR ÷ 12), and n is the total number of months remaining/term.
Break-Even Analysis
Break-Even Point = Closing Costs ÷ Monthly Savings. If closing costs are $6,000 and you save $200/month, you break even in 30 months (2.5 years). If you plan to stay in the home beyond the break-even point, refinancing makes financial sense.
Total Interest Comparison
Total interest on current loan: (current payment × remaining months) − loan balance. Total interest on refi: (new payment × new term months) − loan balance. The difference shows your total interest savings — but if you extend your term (e.g., from 25 to 30 years), you may pay more total interest despite a lower rate.
Frequently Asked Questions (FAQs)
Is refinancing worth it in 2026?
Refinancing is worth it if you can lower your rate by at least 0.75-1% and plan to stay in the home past the break-even point. In 2026, with rates between 5.5-7%, borrowers who took mortgages at 7.5-8% in 2023-2024 may benefit significantly from a rate and term refinance. Always factor in closing costs, which typically range from 2-5% of the loan amount.
What is the break-even point on a refinance?
The break-even point is the time it takes for your monthly savings to cover the closing costs. For example, if closing costs are $5,000 and you save $200/month, you break even in 25 months. If you plan to move before the break-even point, refinancing likely isn't worth it. Most experts recommend refinancing only if the break-even point is under 3-4 years.
What LTV ratio do I need to refinance?
For a conventional refinance, most lenders require an LTV ratio of 80% or lower (20% equity). FHA streamline refinances allow up to 95% LTV. VA loans have no LTV limit for IRRRL (streamline) refinances. If your home value has declined, cash-in refinancing (bringing cash to closing) can help lower your LTV. Use our calculator to check your LTV before applying.
Should I refinance to a 15-year or 30-year mortgage?
A 15-year refinance typically offers a lower rate (0.25-0.5% lower than 30-year) but significantly higher monthly payments. Example: Refinancing a $300,000 loan from 7% to 5.5% on a 15-year term increases monthly payment from ~$1,995 to ~$2,451 but saves $160,000+ in total interest. A 30-year term lowers monthly payments but may extend your payoff timeline and increase total interest paid. Choose based on your cash flow needs and retirement timeline.
What closing costs can I expect for a refinance?
Refinance closing costs typically range from 2% to 5% of the loan amount. On a $300,000 loan, that's $6,000-$15,000. Common costs include: application fee ($300-500), appraisal ($400-600), title search ($400-1,000), origination fee (0-1% of loan), recording fees ($100-300), and prepaid interest. Many lenders offer "no-closing-cost" refinances in exchange for a slightly higher rate, which can be beneficial if you plan to move soon.
Can I refinance with an FHA or VA loan?
Yes. FHA Streamline Refinance requires no appraisal or income verification (for rate/term) and allows up to 95% LTV. VA IRRRL (Interest Rate Reduction Refinance Loan) requires no appraisal and has no LTV limit — any veteran with an existing VA loan can typically qualify. Both streamline programs offer lower closing costs than conventional refinances. USDA loans also have a streamline refinance option for eligible rural properties.
How much does a credit score affect my refinance rate?
Your credit score significantly impacts your refinance rate. In 2026: 760+ (excellent): best rates −0.25% to −0.5% below advertised, 700-759 (good): standard rates, 640-699 (fair): rates +0.5% to +1.5%, below 640: may not qualify for conventional refinancing. A 100-point credit score difference can cost $50-150/month on a $300,000 loan. Check your credit score and consider improving it before applying.
Data Sources & Methodology
- Mortgage Rate Data: Current rate averages from Freddie Mac Primary Mortgage Market Survey. 30-year fixed rates averaged 5.75-6.5% in Q1 2026.
- Closing Cost Estimates: Based on CFPB Closing Disclosure Guidelines. Typical costs range from 2-5% of loan amount.
- LTV Requirements: Conventional loan guidelines from FHFA. Standard 80% LTV for conventional refinancing.
Related Tools
- Home Affordability Calculator — How much house can you afford?
- Mortgage Calculator UK — UK mortgage repayment estimates.
- Rental Property ROI Calculator — Cap rate, cash flow, and ROI analysis.
- Loan Comparison Calculator — Compare multiple loan options side-by-side.
📖 Related Reading
For a complete guide to refinancing strategies, rates, and what to watch out for in 2026, read our blog post: Mortgage Refinance Guide 2026.