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Amortization Calculator

Every payment split into interest and principal, with extra payments if you make them.

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How the amortization calculator works

Amortization spreads a loan into equal payments. Each month, interest is the balance times the monthly rate; the rest of the payment reduces the balance. Early payments are mostly interest, later ones mostly principal.

Extra payments are applied straight to principal on the payment you choose, so every later month charges interest on a smaller balance. The schedule shows how much sooner the loan ends and how much interest you avoid.

Using and checking your result

Published by JustYourCalculator. Check the units and assumptions above, and compare a known example before relying on the output. Calculations use browser arithmetic and may round displayed values.

This is an educational estimate, not a lender quote, tax filing calculation or investment recommendation. Actual costs depend on current rules, fees and your circumstances. Verify important decisions with official sources and a qualified adviser.

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Frequently asked questions