What Is a Refinance Calculator?
A refinance calculator helps you determine whether refinancing your mortgage makes financial sense. The key question is not just "will my payment go down?" but "how long until the savings pay back the closing costs?" That point is the break-even period — and if you plan to stay in your home longer than that, refinancing saves you money.
When Does Refinancing Make Sense?
Refinancing is generally worthwhile when: (1) the new rate is at least 0.5%–1% lower than your current rate, (2) you plan to stay in the home past the break-even point, (3) your credit score has improved enough to qualify for better terms, or (4) you need to change your loan term (shorten or extend).
The Break-Even Calculation
Break-even months = Closing Costs ÷ Monthly Savings. If closing costs are $4,000 and monthly savings are $200, break-even = 20 months. If you stay 36 more months, you net $3,200 in real savings after recovering the cost of refinancing.
No-Cost Refinancing: Is It Worth It?
Some lenders offer "no-cost" refinancing by rolling closing costs into the loan or charging a slightly higher rate. The tradeoff: you start saving immediately (no break-even needed) but pay slightly more per month forever. No-cost refinancing is ideal if you are uncertain how long you will stay.
Frequently Asked Questions
Refinancing generally makes sense when the new rate is at least 0.5%–1% lower than your current rate, your break-even point is within your planned time in the home, and closing costs are reasonable.
The break-even point is how many months it takes for your monthly savings to offset the closing costs. If you plan to stay longer than the break-even period, refinancing saves you money.
Refinancing closing costs typically run 2%–5% of the loan amount, averaging $3,000–$6,000 for a $300,000 loan. Costs include origination fees, appraisal, title insurance, and government fees.
You can refinance with lower credit, but you will likely pay a higher interest rate. FHA streamline refinancing has more lenient credit requirements for existing FHA loans.
A cash-out refinance replaces your mortgage with a larger loan, letting you access home equity as cash. Use our HELOC calculator to compare cash-out refinancing vs a HELOC.
Refinancing to a shorter term (15 years from 30) dramatically reduces total interest paid but increases monthly payments. Use this calculator to compare scenarios side-by-side.
Mortgage interest is deductible if you itemize deductions. Refinancing closing costs may be partially deductible. Consult a CPA for tax implications specific to your situation.
A rate-and-term refinance simply changes your interest rate and/or loan term. A cash-out refinance additionally lets you borrow against equity. Rate-and-term is simpler and usually costs less.
Yes. If your home has appreciated or you have paid down enough principal to reach 20% equity, refinancing can eliminate PMI — providing additional monthly savings beyond the rate reduction.
The refinancing process typically takes 30–60 days from application to closing. During this period, you continue making payments on your existing loan.