Calculate
Amortization assumptions
AMZModel a fixed-rate loan, then layer on extra monthly, yearly, and one-time payments to see how the payoff path changes.
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Open categoryThis calculator is part of the finance section. Keep the current tool open for calculation, then use the related calculators below to compare nearby planning tasks.
Finance calculator
Amortization Calculator
Use a fuller amortization calculator to see how each payment changes the balance and how extra payments can shorten the loan timeline.
How to use this calculator
How the amortization calculator works
This page expands a standard loan payment into a full amortization view. It estimates the regular monthly payment, then shows how each payment splits into interest and principal while the remaining balance declines over time.
- Use the loan amount, term, rate, and start date to establish the base amortization schedule.
- Add extra monthly, yearly, or one-time payments if you want to test faster payoff paths and lower total interest.
- Review the chart and tables together if you want to understand both the overall repayment cost and the payment-by-payment breakdown.
Formula / method
Formula / method
This amortization calculator uses the existing ToolModule calculation model for the inputs shown above. The page keeps the original formulas and result logic intact, then presents the output in a clearer working layout.
- Start with the required inputs in the form above.
- The calculator applies the existing ToolModule calculation logic for this tool.
- Review the result cards, tables, and charts together before making a real-world decision.
Example calculation
Review the current live example
The example below reflects the current values shown in the calculator above, so it updates as you change the form without altering the calculation logic itself.
Example inputs
Loan amount200,000
Loan term (years)15
Loan term additional months0
Annual interest rate (%)6
Loan start date2026-01
Example outputs
Monthly pay$1,687.71
Total of payments$303,788.46
Total interest$103,788.46
Total extra payments$0.00
Disclaimer
Use results as planning guidance only
Results are for reference only and do not constitute financial, investment, tax, or legal advice. Product terms, lender rules, tax treatment, and fees can vary in real situations.
- Do not treat calculator output as financial, investment, medical, or legal advice.
- Check assumptions, dates, tax rules, and provider-specific terms before acting on a result.
- Use official documents or professional guidance when the decision has material consequences.
FAQ
Common Amortization questions
What does amortization mean in a loan schedule?
Amortization is the gradual repayment of debt over time through recurring payments. Each payment usually covers interest first and then reduces principal.
Why are early payments mostly interest?
At the beginning of a loan, the balance is larger, so the interest charged on that balance is also larger. As the balance drops, more of each payment can go toward principal.
How do extra payments affect an amortization schedule?
Extra payments usually reduce principal faster, which lowers future interest charges and can shorten the total payoff period.