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MoneyCalcKit helps you estimate loans, savings, salary, taxes, budgets, and investments using standard financial formulas. All 48 calculators run entirely in your browser — instant results, no sign-up, and your calculator inputs stay local.

A refinance estimate should compare monthly savings against closing costs and break-even time. A lower payment is not always enough to justify refinancing.

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Calculator Guide

How the Refinance Calculator works

Refinancing replaces an existing loan with a new one — usually to get a lower rate, change the term, or tap equity. Whether it pays off depends on the new payment, the closing costs, and how long you keep the loan (the break-even point).

Formula

Break-even months = Closing costs ÷ Monthly savings

Monthly savings is the old payment minus the new payment (each from the amortization formula). Closing costs are the fees to refinance. If you keep the loan longer than the break-even point, refinancing saves money overall.

Worked example: refinancing to save $180/month with $3,600 in costs

  1. Old payment = $1,770; new payment after refinancing = $1,590, so monthly savings = $180.
  2. Closing costs = $3,600.
  3. Break-even = 3,600 ÷ 180 = 20 months.
  4. If you keep the home longer than 20 months, you come out ahead; sell sooner and the refinance costs you money.

How to read the result

A lower monthly payment isn't automatically a win. If refinancing resets a 30-year clock, you can pay more total interest even at a lower rate. Compare both the break-even point and the total remaining interest of the old vs. new loan.

Common mistakes to avoid

  • Looking only at the lower payment while ignoring that the term restarts.
  • Forgetting closing costs, which can erase savings if you move or sell soon.
  • Refinancing repeatedly and resetting amortization each time, increasing lifetime interest.

Tips

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Editorial note: Prepared by MoneyCalcKit editors and last reviewed June 1, 2026. Calculators use transparent formulas and browser-side inputs for educational planning estimates.

Frequently Asked Questions — Refinance Calculator

Compare the break-even point (closing costs ÷ monthly savings) to how long you plan to keep the loan. If you'll stay past break-even, refinancing saves money.
Yes — if it resets a 30-year term, you may pay more total interest despite the lower rate. Compare total remaining interest on both loans, not just the payment.
If you can afford the higher payment, a shorter term locks in interest savings and avoids restarting amortization, often making it the better choice.
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