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Mortgage Amortization Calculator

Adjust the inputs below. Results update as you type.

How it works

Each payment: interest = balance × monthly rate; principal = payment − interest; new balance = balance − principal. Early payments are mostly interest; late payments mostly principal (front-loaded interest structure). Extra principal payments applied early in the loan save the most interest because they eliminate years of compounding. Bi-weekly payments (26 per year) make one extra monthly payment annually.

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