See every payment, month by month

Loan Amortization Calculator Online

Enter your loan principal, rate and term to build a full monthly schedule. Add an extra monthly payment to see how much interest and time you could save.

Loan details

Adjust any field and the schedule recalculates instantly.

$
%
years
$
Monthly payment$0
Payoff date–
Total paid$0
Total interest$0

Add an extra monthly payment above to see potential interest savings.

Monthly amortization schedule

#DatePaymentPrincipalInterestBalance
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How this amortization calculator works

Every month, interest is charged on the remaining balance at your monthly rate (the annual rate divided by twelve). The rest of your fixed payment reduces principal, and the new balance carries into the next month. Any extra payment you add goes straight to principal, which compounds savings over the life of the loan.

See the full picture

Scroll through every payment from month one to payoff, with running balance shown alongside each row.

Test extra payments

Add a fixed amount each month and instantly see the new payoff date and interest savings.

Export for records

Download the complete schedule as a CSV file for spreadsheets, budgeting apps or loan officers.

Loan amortization calculator FAQ

How is a loan amortization schedule calculated?

Each month's interest is the remaining balance multiplied by the monthly rate. The rest of the fixed payment reduces principal, and the new balance carries forward to the next month.

How do extra payments shorten a loan?

An extra monthly payment is applied directly to principal, which lowers the balance faster, reduces future interest charges, and can pay off the loan before the original term ends.

Can I download the full payment schedule?

Yes. Select Download CSV to save every payment row, including date, payment, principal, interest and remaining balance, as a spreadsheet file.

Does the start date affect the calculation?

The start date only affects the calendar dates shown for each payment. The payment amount and interest math are based on principal, rate and term.

Is this loan calculator private?

Yes. All amortization math runs locally in your browser. Your loan details are never uploaded or stored on a server.

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