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Amortization Schedule Calculator
Generate a loan amortization schedule showing the breakdown of principal and interest for each payment.

Amortization Schedule Calculator

See exactly how your loan payments are divided between principal and interest over time. Enter your loan details to generate a complete amortization schedule and see how extra payments can save you thousands in interest.

Amortization is the process of spreading a loan into a series of fixed payments over time. Each payment consists of two parts: interest on the remaining balance and a portion that reduces the principal. In the early years of a loan, most of each payment goes toward interest. Over time, the interest portion shrinks and the principal portion grows.

The amortization formula calculates the fixed monthly payment as: M = P[r(1+r)^n] / [(1+r)^n - 1]. For each payment, the interest portion equals the remaining balance multiplied by the monthly rate. The principal portion is the total payment minus the interest.

Making extra principal payments can dramatically reduce both the total interest paid and the loan payoff time. Even an extra $100/month on a $250,000 30-year mortgage at 6.5% saves over $50,000 in interest and pays off the loan nearly 6 years early. Extra payments go entirely toward reducing the principal, which reduces the interest accrued in every subsequent month.

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