About This Calculator

The Refi Break-Even Calculator is a small, single-purpose tool built to answer one question clearly: when does a mortgage refinance actually start saving you money? It is maintained by Marcio, an independent tools builder who designs calculators that show their full math rather than hiding it behind a black box.

There is no sign-up, no lead form, and nothing is sent anywhere. Every calculation runs in your browser using the standard mortgage amortization formula, the same one lenders use. We deliberately keep the inputs limited to the figures that change the answer, the loan balance, the two rates, the terms, and the closing costs, so the result is easy to trust and easy to reproduce by hand.

The goal is information gain, not advice. We explain how the break-even point and lifetime interest are derived so you can sanity-check the output and understand what drives it. For the reasoning behind the numbers, see the refinance decision guide and the 15-year vs 30-year comparison.

If you spot an error or have a suggestion, the contact page tells you how to reach us. These estimates are educational and are not a substitute for advice from a licensed mortgage professional.