🔄 Refinance Calculator
Compare current vs new loan terms for auto, personal, student, or business debt. See monthly savings, break-even months, and total interest saved — any non-mortgage loan.
Refinance Savings for Mortgages and Auto Loans
BrainyCalculators editorial insight — unique to this tool
Refinancing replaces an existing loan with a new one — common for US 30-year mortgages when rates drop 0.75–1% or more, and for auto loans when credit scores improve. This calculator models monthly payment change, total interest saved, and break-even months against closing costs. It covers both home and vehicle debt, not only primary residences.
When to use this calculator
Use for general mortgage or auto refinance comparison including closing costs and break-even. For US home-specific scenarios with property tax and PMI context, Mortgage Refinance adds real-estate framing.
| Reference | Value | Context |
|---|---|---|
| Rate drop trigger | 0.75–1%+ | Rule of thumb |
| Closing costs | 2–5% of loan | US mortgage typical |
| Break-even | Costs ÷ monthly savings | Key decision metric |
| Auto refinance | Often no closing cost | Credit union common |
Not what you need? For primary-residence-focused break-even with housing-specific costs, use Mortgage Refinance. For original loan payment, use EMI or Home Loan.
Refinancing a home loan specifically?
This general refinance calculator works for mortgages, auto loans, and personal loans. For a home-loan-focused analysis with property-specific fields, use our Mortgage Refinance Calculator →
Current Loan
New Loan
Comparison Summary
| Metric | Current Loan | New Loan |
|---|---|---|
| Monthly Payment | — | — |
| Total Interest | — | — |
| Loan Term | — | — |
| Total Cost | — | — |
Refinance Formulas
Example Calculation
Current loan: $220,000 balance, 7.25%, 300 months remaining. New loan: 6.25%, 360 months, $4,500 closing costs.
When Refinancing Any Loan Makes Financial Sense
Refinancing replaces an existing loan with a new one — auto loans, personal loans, student loans, and business term debt. The decision hinges on whether lower interest, a shorter term, or consolidated payments save more than closing fees over the time you will keep the debt.
This general calculator compares remaining balance, rate, and term in months — ideal for non-mortgage debt. A $28,000 auto loan dropping from 8.9% to 5.4% may break even in under a year if fees are modest, but extending the term lowers the payment while sometimes increasing total interest.
Home loans add appraisal, title, escrow, PMI, and equity considerations. For property-specific refinance with closing costs and years-based terms, use the Mortgage Refinance Calculator linked above.
How the Refinance Calculator Works
Formula, assumptions, and calculation steps for this finance tool.
Methodology
Financial calculators use time-value-of-money, rate conversion, amortization, or return formulas depending on the tool. Inputs are normalized to matching periods before the final result is calculated.
Calculation Steps
- Enter the principal amounts, rates, terms, or cash flows requested by the calculator.
- Convert annual rates to the correct monthly, daily, or yearly period when needed.
- Apply the finance formula for payment, return, yield, or future value.
- Show the result with supporting totals such as interest, gain, or balance.
Assumptions and Limits
- Rates are assumed constant unless the calculator asks for a schedule.
- Taxes, fees, and inflation are included only when fields are provided.
- Financial results are estimates for planning, not investment or lending advice.
Frequently Asked Questions
It often works when your credit score improved, market rates fell, or the lender fees are low enough that monthly savings recover costs within your planned ownership period.
Include origination charges, title or lien fees, state registration costs, and any prepayment penalty on the old loan. Omit property-only charges unless you are refinancing secured real estate.
A longer term cuts the monthly payment but can raise lifetime interest even at a lower rate. Compare total interest, not just the instalment amount.
Divide total refinance fees by monthly payment savings. If you sell the car or pay off early before that month count, the refinance may lose money overall.
Real-World Applications
General Refinance Mistakes to Avoid
Refinancing Break-Even Quick Reference
| Monthly Savings | Closing Costs: $5,000 | Closing Costs: $10,000 |
|---|---|---|
| $100/mo | 50 months | 100 months |
| $200/mo | 25 months | 50 months |
| $300/mo | 17 months | 33 months |
| $400/mo | 13 months | 25 months |
| $500/mo | 10 months | 20 months |
References
- Consumer Financial Protection Bureau. Should I Refinance? consumerfinance.gov, 2024.
- Freddie Mac. Mortgage Rates Survey. freddiemac.com, 2024.
- HUD. Streamline Refinancing for FHA Loans. US Department of Housing and Urban Development, hud.gov, 2024.
- Investopedia. Mortgage Refinancing: When Does It Make Sense? investopedia.com, 2024.
- National Association of Realtors. Housing Finance Data. nar.realtor, 2024.
Related Calculators
Browse all Finance calculators →Mortgage Calculator
Estimate monthly mortgage payments including principal, interest, taxes, and insurance.
Home Loan Calculator
Calculate monthly home loan EMI, total interest payable, and repayment schedule.
Mortgage Refinance Calculator
Calculate potential savings from refinancing your mortgage with a new interest rate and loan term.