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Refinance Calculator

Refinancing replaces your current mortgage with a new one, usually for a lower interest rate. This calculator shows your new payment, your monthly saving, the break-even point on the closing costs, and whether you come out ahead overall.

Refinance Calculator

Enter your current loan and the new offer to compare the payments and the total interest.

Your results

Current monthly payment$0
New monthly payment$0
Monthly saving$0
Break-even point–
Total interest if you keep the current loan$0
Total interest on the new loan$0
Net saving after closing costs$0
Press Calculate to see whether refinancing leaves you ahead overall.

Results are estimates for educational purposes only. They are based on the numbers you enter and are not financial advice.

How to use this refinance calculator

  1. Enter your current loan balance. Your latest mortgage statement shows the exact figure, and most servicers show it in their app or online portal too.
  2. Add your current interest rate. It is printed on your mortgage statement and on your original loan documents.
  3. Enter the years left on your current loan. Count from today to the payoff date on your statement. If you are 3 years into a 30 year loan, you have 27 years left.
  4. Enter the new interest rate from the refinance offer you are considering. It is on the lender’s quote or Loan Estimate.
  5. Add the new loan term in years, also from the quote. A fresh 30 year term is common, but lenders offer shorter terms too.
  6. Enter the closing costs. The lender’s Loan Estimate lists them, and they usually come to 2 to 5% of the loan amount.
  7. Press Calculate. You will see your current and new monthly payments, the monthly saving, the break-even point on the closing costs, the total interest on both loans, and your net saving after those costs come off.

A worked example

Say you owe $280,000 at 7.25%, with 27 years left on the loan. Your current monthly payment is $1,971.74, and if you keep this loan you will pay $358,844.79 in interest over the remaining term.

A lender offers you 6% on a new 30 year loan, with closing costs of $5,500. The new monthly payment is $1,678.74, which saves you $293.00 a month. Dividing the $5,500 of closing costs by that $293.00 monthly saving gives a break-even point of 18.8 months. From that month onwards, the refinance leaves you ahead. The new loan carries $324,346.93 of total interest, so once the closing costs come off, the net saving is $28,997.86.

One caution sits inside those figures. The new 30 year term restarts the clock, which is why the total interest matters as much as the monthly saving. The lower rate wins clearly in this example, but if you planned to move before month 19, the closing costs would never be earned back and the refinance would lose money. The Consumer Financial Protection Bureau offers free guides for home buyers and borrowers.

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How this refinance calculator works

Refinancing swaps the remaining balance of your current loan onto a new interest rate and a new term. The calculator works out the monthly payment for the years left on your current loan and for the new loan on the same balance, using the standard monthly payment formula.

The saving arrives month by month through the lower payment, so the closing costs must first be earned back. Dividing the closing costs by the monthly saving gives the break-even point: the month from which the refinance starts to leave you ahead.

Stretching the loan back out to a full new term lowers the monthly payment, but it can also raise the total interest you pay over the life of the loan. That is why this calculator compares the total interest on both loans, not just the monthly payment, and shows the net saving after the closing costs have been taken off.

Practical tips

Frequently asked questions

When does refinancing make sense?

Refinancing makes sense when the new rate cuts your payment enough to repay the closing costs before you expect to move or refinance again, and when the total interest you pay falls as well.

How much are refinance closing costs?

Refinance closing costs typically come to 2 to 5% of the loan amount, similar to the costs on the original purchase. They cover items such as the lender fee, valuation and legal work.

Does refinancing restart my loan term?

Yes. A new 30-year loan restarts the clock, which is why the total interest matters so much. Choosing a shorter new term keeps more of the benefit of the lower rate.

Can I take cash out when I refinance?

Yes. A cash-out refinance borrows more than your current balance and pays you the difference in cash, at the cost of a bigger loan and a higher monthly payment.