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Got a question that involves number crunching? Use the calculators on this page to find the mathematical answer to the most commonly asked number-crunching questions, and see your inputs displayed next to the graph, chart, and/or table output in a side-by-side display.

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Loan Amortization Calculator

Before making a large purchase, it's likely that many questions will arise, particularly in regard to financing. For example:

What will the monthly payment be?

How will the loan term affect the monthly payment (e.g., 15-year, 30-year)?

How will the interest rate affect the monthly payment?

This calculator can be used to answer these questions and illustrate key issues.

Enter the required values to calculate the monthly payment, and select the desired output. An annual amortization table and two charts comparing principal and interest payments can be generated.

Loan Amortization Calculator Results
Monthly payment: $421.60Total payments: $151,777Total interest: $51,777

Your monthly payment is: $422

This chart shows the part of your yearly payments that is applied to interest and the part that is applied to principal.

Over time, though your payments stay the same, the interest portion decreases, and the principal portion increases.

Over the term of your loan you have total payments of $151,777, of which $51,777 is interest payments.


  • Calculation assumes constant monthly payments over the life of the loan, monthly calculation of interest on the remaining unpaid principal, and no prepayment. Only principal and interest payments are included; property tax and/or insurance payments are not included.
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