FINANCE · FREE TOOL
Amortization calculator
See monthly principal, interest and balance, including extra payments.
Your inputs
Enter your values, then calculate.
Decimal-point numbers; displayed rounding does not change internal values. Calculations stay on this device.
YOUR RESULT
Make the numbers clear.
Save calculation JSON ↓Calculation breakdown
Scroll sideways to see every column. You can also focus the table and use the arrow keys.
How this calculation works
The required payment is set by the original term; extra monthly principal accelerates payoff. The schedule stops at zero and never charges more than balance plus period interest. Lenders may apply rounding and extra-payment rules differently.
Reference: method and limitations. Method reviewed October 22, 2026.
Check the assumptions
Use one currency consistently; financial outputs use that same currency, except the U.S. tax tool specifically uses USD. Financial models use your assumptions, not live rates or personalized financial advice. Check the result against your contract or the applicable tax rules.