About the Refinance Calculator
Refinance Calculator helps estimate the key numbers involved in mortgage & real estate decisions. It is designed for quick scenario comparison: enter a realistic set of values, calculate the result, then change one assumption at a time to see what has the greatest effect. Unlike a static table, the result responds to your inputs and keeps the calculation in your browser. Amounts are displayed in U.S. dollars for consistency, but the mathematical formulas can be used with another currency when every monetary input uses that same currency.
How to use this calculator
Enter values that match your situation and select Calculate result. Review the main result and its supporting figures, then change one input at a time to compare scenarios. Results are rounded for readability while the calculation retains additional precision internally.
Information you will need
- Loan amount
- Loan term
- Interest rate
- Compounding
- Payment frequency
- Extra payment
How the calculation works
Standard fixed-payment amortization with compound frequency options. Finds the level payment that reduces the balance to zero. Read the primary result together with the supporting values rather than focusing on one number alone. A useful estimate should make its assumptions visible. If the answer looks surprising, verify the unit, rate, time period, and whether the entered value is gross or net. Run a conservative and an optimistic scenario to understand the range of possible outcomes.
Formula or method
Payment = P × r(1+r)n / ((1+r)n - 1). At zero interest, payment = P / n.
Worked example
$100,000 at 6.5% for 10 years with monthly compounding costs about $1,135/month.
The example is illustrative rather than a recommendation. Use your own verified values and keep all monetary or measurement units consistent. When comparing alternatives, save or note each result so the assumptions do not become mixed.
How to interpret the result
The primary output answers the main question posed by the refinance calculator, while the additional cards provide context. A result with many decimal places is not necessarily more certain. The displayed precision makes comparison easier, but uncertainty in the inputs can be larger than the rounding difference.
Compare the result with a second scenario using a less favorable rate, return, cost, or time period. This sensitivity check often provides more useful planning information than one best-case projection.
Limitations and important notes
The refinance calculator is a planning tool, not a quote, filing calculation, lending decision, or promise of future performance. It does not automatically retrieve live market rates or apply every fee, tax bracket, program rule, product limit, or state law. Rules for products such as FHA, VA, Social Security, retirement accounts, and taxes can change. Confirm time-sensitive values with the lender, plan administrator, IRS, SSA, or another relevant authority before acting.
Frequently asked questions
When does refinancing my mortgage make sense?
Refinancing is typically worth it when you can lower your interest rate by at least 0.75-1% and plan to stay in the home long enough to recover the closing costs. Calculate the break-even point: closing costs divided by monthly savings equals the months needed to recoup costs. If you plan to stay longer than the break-even period, refinancing saves money. A shorter break-even makes refinancing attractive even with smaller rate drops.
What are the costs of refinancing?
Refinancing costs include origination fees, appraisal, title insurance, and closing costs, typically 2-5% of the loan amount. On a $300,000 loan, that is $6,000-$15,000. Some lenders offer no-closing-cost refinances, but they roll the fees into the loan balance or charge a higher rate. Compare the total cost across lenders and weigh it against your expected monthly savings.
How do I know if refinancing will save me money?
Compare your current monthly payment to the new payment. Subtract the new payment from the current payment to find monthly savings. Then divide closing costs by monthly savings to find the break-even point. If you will stay in the home past that point, refinancing saves money. For example, $6,000 in costs divided by $250/month savings means a 24-month break-even, so refinancing pays off if you stay more than two years.
What is the break-even point on a refinance?
The break-even point is when your cumulative monthly savings equal your closing costs. Calculate it by dividing total refinance costs by your monthly savings. For example, $6,000 in costs divided by $250/month savings means a 24-month break-even. If you plan to stay in the home past that point, the refinance pays off; if you will move sooner, it likely does not. Shorter break-even periods make refinancing more attractive.
How much should rates drop before I refinance?
A commonly cited rule is that refinancing becomes worthwhile when rates drop at least 0.75-1%, but smaller drops can still pay off with low closing costs or a short payback period. What matters most is your break-even point and how long you will keep the home. For example, refinancing from 6.625% to 6% on a $300,000 loan saves about $120/month, which justifies $3,600 in costs over 30 months. Run the numbers rather than relying on the rule alone.
What is a no-closing-cost refinance?
A no-closing-cost refinance means the lender covers your closing costs in exchange for a slightly higher interest rate or by rolling the fees into your loan balance. You avoid out-of-pocket expenses but pay more over time. It can be a good option if you plan to stay in the home a short time, lack cash for closing costs, or want to preserve savings. Compare the higher rate against your current rate to confirm you still save money.
Should I refinance to a 15-year mortgage?
Refinancing from a 30-year to a 15-year mortgage typically lowers your rate and lets you build equity faster, but raises your monthly payment. If you can comfortably afford the higher payment, you will pay off the home much sooner and save tens of thousands in interest. For example, refinancing a remaining $250,000 balance with 20 years left from 6.5% to a 15-year term at 5.9% shortens your total repayment and cuts interest significantly despite the higher monthly payment.