15 Year Refinance Calculator



Calculating the financial implications of a 15-year refinance can be crucial for making informed decisions about your mortgage. To simplify this process, we present a user-friendly 15-Year Refinance Calculator. This article provides a step-by-step guide on how to use the calculator, the underlying formula, an illustrative example, FAQs, and a conclusion.

How to Use

  1. Enter the current loan amount in the designated input field.
  2. Input the interest rate of your existing mortgage.
  3. Specify the remaining term of your current loan in years.
  4. Enter the new interest rate for the 15-year refinance.
  5. Click the “Calculate” button to obtain the results.


The formula for calculating the monthly payment in a 15-year refinance is given by:


  • is the monthly payment.
  • is the principal loan amount.
  • is the monthly interest rate (annual rate divided by 12).
  • is the total number of payments (loan term in years multiplied by 12).


Suppose you have a $200,000 loan with an existing interest rate of 4%. After refinancing at 3%, the calculator can help you determine the new monthly payment.


Q: How accurate is the 15-Year Refinance Calculator?

A: The calculator uses the precise formula for mortgage payment calculation, ensuring accurate results.

Q: Can the calculator handle different currencies?

A: Yes, the calculator is currency-agnostic; simply enter the loan amount in the desired currency.

Q: Is the interest rate input compounded monthly?

A: Yes, the calculator assumes monthly compounding for precise calculations.

Q: What happens if I enter a negative interest rate?

A: The calculator is designed to handle only positive interest rates; negative values will result in an error.


The 15-Year Refinance Calculator provides a valuable tool for individuals considering mortgage refinancing. By following the simple steps outlined above, users can make informed decisions about their financial future.

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