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CalcTortoise

Mortgage Refinance Calculator

Compare your current mortgage with a new one. See the monthly saving, how long it takes to recover closing costs and what you save over the life of the loan.

Written by the CalcTortoise editorial team · How we work

Current loan

years

New loan

years
Assumed: $7,000 closing costs. Change

Pay the costs

Saving so far, year by year

YearSaving so far (after costs)
Year 1-$3,602
Year 2-$205
Year 3$3,193
Year 4$6,590
Year 5$9,988
Year 6$13,385
Year 7$16,783
Year 8$20,180
Year 9$23,578
Year 10$26,975
Year 11$30,373
Year 12$33,770
Year 13$37,168
Year 14$40,565
Year 15$43,963
Year 16$47,360
Year 17$50,758
Year 18$54,155
Year 19$57,553
Year 20$60,950
Year 21$64,348
Year 22$67,745
Year 23$71,143
Year 24$74,540
Year 25$77,938
Year 26$81,335
Year 27$84,733
Year 28$61,089
Year 29$37,446
Year 30$13,802

How to use this calculator

  1. Enter your current balance, rate and years left.
  2. Enter the new rate, term and closing costs from the lender’s Loan Estimate.
  3. Choose whether to pay the costs in cash or add them to the loan.

Frequently asked questions

When does refinancing make sense?

When you will keep the loan past the break-even point — the month your savings repay the closing costs. In the example ($320,000 at 7.25% refinanced to 6.25% with $7,000 of costs), you save $283 a month and break even in 2 years 1 month.

Does restarting a 30-year term cost more?

It can. The example stretches the 27 years left into a new 30-year loan, for a lifetime saving of $13,802. Refinancing to a 27-year term instead saves $206 a month and $59,886 over the life of the loan.

Is half a percentage point enough to refinance?

Sometimes. A 0.5-point drop on the example loan saves $178 a month, with a break-even of 3 years 4 months. Whether that is worth it depends on how long you will stay.

Should I pay closing costs or roll them into the loan?

Rolling them in avoids cash at closing but adds interest on the costs for the life of the loan. Paying in cash gives the lower total cost if you have the money.

Sources and method

Standard compound-interest formulas, tested against worked examples. Nothing here depends on outside data; the rates you type in are your own assumptions.

No outside data is used. The numbers you type in are the only inputs.

Page and formula last reviewed . How we calculate · Editorial policy · Corrections and change log

Last updated 10 October 2026. For information only — not financial advice. Check the final figures with your lender or bank.