GWN Tools · Finance

Amortization Schedule Calculator

See a full month-by-month breakdown of principal, interest, and remaining balance for any loan.

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estimated monthly payment
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Estimates only — not financial advice. Verify with your lender/advisor.

Month-by-month schedule

MonthPaymentPrincipalInterestBalance

How an amortization schedule works

An amortization schedule breaks a fixed-payment loan into a month-by-month table, showing exactly how much of each payment goes to interest versus principal and how your balance falls to zero over the term.

What is an amortization schedule?

An amortization schedule is a month-by-month table showing how each loan payment splits between interest and principal, and how the remaining balance shrinks to zero by the end of the term. Early payments are mostly interest; later payments are mostly principal. Results are estimates, not financial advice.

How is each row of the amortization table calculated?

Each month, the interest portion equals the current balance times the monthly rate (APR divided by 12). The principal portion equals the fixed monthly payment minus that interest. The remaining balance is the previous balance minus the principal portion, repeated until the balance reaches zero.

Why is most of my early payment going to interest?

Interest is charged on the outstanding balance, which is highest at the start of the loan. So early payments are mostly interest and little principal. As the balance falls, the interest portion drops and more of each payment goes to principal.