How to Use
Enter your loan amount, annual interest rate, and loan term in years.
Optionally provide a start date (defaults to today) and an extra monthly payment amount.
Click Calculate to generate your full amortization schedule.
Review the summary cards, scrollable month-by-month table, and yearly chart.
Click Export PDF to download a formatted copy of your schedule.
Extra Payments: Worth It?
Important Note
Results are estimates based on the standard fixed-rate amortization formula. They do not account for variable interest rates, origination fees, taxes, insurance, lender rounding, or prepayment penalties. Always confirm exact figures with your lender or a qualified financial advisor before making financial decisions.
How The Amortization Formula Works
Each monthly payment M is calculated using M = P x [r(1+r)^n] / [(1+r)^n - 1], where P is the principal (loan amount), r is the monthly interest rate (annual rate / 12 / 100), and n is the total number of months (years x 12). Every payment first covers the month's interest — calculated as the current balance multiplied by r — with the remainder reducing the principal. Early in the loan, most of each payment is interest; as the balance falls, the interest portion shrinks and the principal portion grows. Extra payments go entirely toward principal, which accelerates the balance reduction and saves compounding interest in future months.
Key Features
Full Amortization Schedule
Month-by-month breakdown of every payment for the entire life of your loan.
Extra Payment Analysis
See precisely how much interest and time you save by paying extra principal each month.
Principal vs Interest Chart
Yearly grouped bar chart comparing cumulative principal paid vs. interest paid.
Privacy And Security
This tool processes all calculations entirely within your web browser. No personal data or loan details are transmitted to any server.
Frequently Asked Questions
What information do I need to use the Amortization Calculator?
Enter the loan amount, annual interest rate, and term in years to generate your schedule. You may also input an optional start date and extra monthly payment amount to refine your projections. All calculations process directly within your browser without uploading sensitive financial data to any server.
Can I see how extra payments affect my loan payoff?
Inputting an extra monthly payment amount accelerates your payoff date and significantly reduces total interest paid over the life of the loan. The tool generates a detailed monthly schedule that displays the updated principal and interest breakdown for every period. You can view these specific savings in the summary metrics and the yearly bar chart comparing principal versus interest.
Does the calculator support variable interest rates or fees?
The tool uses standard fixed-rate formulas and does not account for variable rates, origination fees, or prepayment penalties. Results are estimates based strictly on the fixed inputs you provide for a standard loan scenario. Users should consult a financial advisor for loans with complex fee structures or fluctuating rates.
How can I save or share my amortization schedule?
Export your generated results as a PDF file for documentation and record-keeping purposes. Review the scrollable table of monthly data and the summary metrics before finalizing your export. This feature helps borrowers and analysts maintain accurate records of their loan projections without needing external software.
What is the maximum loan term supported by this calculator?
The tool supports flexible loan terms up to 50 years for your calculations. It handles the mathematical breakdown required for long-term mortgages and other extended financing periods. Users can adjust the term in years to see exactly how it impacts monthly payments and total interest costs.