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Refinance Calculator

Unlock your equity. Compare your current loan with today's market rates and determine the exact break-even point for your refinance strategy.

Current Loan Baseline

New Loan Parameters

Financial Rule: Only refinance if the "Net Tangible Benefit" is clear. For most, this means lowering your interest rate by at least **0.75% to 1%**.

Debt Optimization Analytics

The Strategy of
Mortgage Refinancing

Refinancing isn't just about getting a lower interest rate—it's a strategic financial maneuver to optimize your largest debt. However, refinancing is not free. Between appraisal fees, origination charges, and title insurance, Closing Costs can often reach thousands of dollars. Our calculator helps you determine if the monthly savings outweigh these upfront costs by calculating your Break-Even Point: the exact moment your savings pay for the transaction.

Break-Even Point

The number of months it takes for your monthly savings to equal the cost of the refinance. If you plan to sell the home before this point, refinancing is a loss.

Rate Reduction

A lower rate reduces the interest portion of your PITI payment, allowing you to build equity faster or lower your monthly overhead.

Cash-Out Refi

Extract your home's equity as a lump sum of cash for home improvements or debt consolidation. This increases your principal but leverages low-rate debt.

When Does Refinancing Make Sense?

Lenders often speak about a "Net Tangible Benefit." This is a regulatory requirement to ensure the borrower is actually better off after the refinance. Common benefits include:

  • Lowering the Interest Rate: Usually the primary goal.
  • Shortening the Term: Moving from a 30-year to a 15-year mortgage to pay off the debt faster (even if the monthly payment rises).
  • Removing PMI: If your home value has increased, refinancing can remove Private Mortgage Insurance.
  • Switching from ARM to Fixed: Trading a variable rate for the security of a fixed rate.

Calculating the True Cost

Closing costs typically range from 2% to 5% of the loan amount. These include:

  • Application & Origination Fees: The bank's charge for processing the loan.
  • Appraisal Fee: To confirm the current market value of your home.
  • Title Search & Insurance: To ensure the property can be legally transferred.
  • Pre-paid Taxes & Insurance: Funding your new escrow account.

The Danger of "Restarting the Clock"

If you have 20 years left on your 30-year mortgage and you refinance into a *new* 30-year mortgage, you have just added 10 years of payments. Even if your monthly payment is $200 lower, the extra 10 years of interest might mean you pay much more in the long run. Always check the Total Interest Savings in our calculator.

Refinance Pro Tips:

  • • No-Closing-Cost Refi: Lenders offer "no-cost" deals by increasing the interest rate slightly. This is often better if you only plan to stay in the home for 3-5 years.
  • • Shop Around: Rates and closing costs vary wildly between banks, credit unions, and online lenders.
  • • Credit Score: Before refinancing, check your credit. A score increase of 20 points could lower your interest rate by another 0.25%.

The Break-Even Formula

Break-Even (Months) = Total Closing Costs / Monthly Payment Savings. If your costs are $6,000 and you save $200/month, your break-even point is **30 months**. If you sell at 24 months, you lost $1,200 by refinancing.

How to Use This Tool

Input your "Remaining Principal" and "Current Rate." Set your "Remaining Years" (important for total interest comparison). Enter the "New Rate" and "New Term" offered. Don't forget to include the "Closing Costs." The calculator will immediately tell you the Monthly Savings and the Break-Even Point. Review the Side-by-Side comparison to see the "Net Tangible Benefit" clearly.

How the calculation works

A refinance replaces the old payment with a new amortizing payment on the new balance and rate.

M = P × [ r(1+r)^n ] / [ (1+r)^n − 1 ] r = annual rate ÷ 12 n = years × 12

M is principal and interest only. Taxes, fees, and insurance are added after this payment.

Worked example: $300,000 at 6% for 30 years

  1. Loan amount P = $300,000.00.
  2. Monthly rate r = 6 ÷ 12 ÷ 100 = 0.005000.
  3. Number of payments n = 30 × 12 = 360.
  4. Monthly principal and interest = $1,798.65.
  5. Interest over the full term = $347,514.57.

Same loan, different term or rate

CaseMonthly paymentTotal interest
30 years at 6%$1,798.65$347,515
15 years at 6%$2,531.57$155,683
30 years at 7%$1,995.91$418,527

Frequently asked questions

What is the monthly payment on $300,000 at 6% for 30 years?▼
About $1,798.65. That payment covers principal and interest. Over 30 years the interest is about $347,515.
What does the payment formula use?▼
It uses the loan amount, the monthly interest rate, and the number of monthly payments. The payment stays level, while the share that goes to interest falls over time.
How much interest does a shorter term save at 6%?▼
A 15-year term on the same $300,000 loan costs $2,531.57 a month and about $155,683 in interest, compared with $347,515 on the 30-year term.