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
Complete Amortization Schedule
Generate a detailed month-by-month loan payment table that breaks down every principal and interest component for the entire loan term.
Extra Payment Impact Analysis
Calculate exact interest savings and reduced payoff dates by applying optional extra monthly payments to your amortization plan.
Principal Versus Interest Chart
Visualize yearly cumulative payments with a bar chart that compares total principal paid against total interest paid over time.
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?
Provide the loan amount, annual interest rate, and term in years to begin generating your schedule. You can optionally enter a start date and an extra monthly payment amount to refine your projections. The tool processes all data locally in your browser, ensuring no sensitive financial information leaves your device.
Can I see how extra payments affect my loan payoff?
Adding an extra monthly payment accelerates your payoff date and lowers the total interest paid over the loan life. The calculator updates the monthly schedule to show the new principal and interest breakdown for every period. You can track these specific savings directly in the summary metrics and the yearly bar chart comparing principal versus interest.
Does the calculator support variable interest rates or fees?
This tool relies on standard fixed-rate formulas and excludes variable rates, origination fees, or prepayment penalties. All results remain estimates based strictly on the fixed inputs provided for a standard loan scenario. Users with complex fee structures or fluctuating rates should consult a financial advisor for accurate projections.
How can I save or share my amortization schedule?
Download your generated results as a PDF file to keep for documentation and record-keeping purposes. Review the scrollable table of monthly data and the summary metrics before finalizing your export. This feature allows borrowers and analysts to maintain accurate loan projection records without requiring external software.
What is the maximum loan term supported by this calculator?
The calculator handles flexible loan terms up to 50 years for your specific calculations. It performs the necessary mathematical breakdown required for long-term mortgages and other extended financing periods. Adjust the term in years to see exactly how it impacts your monthly payments and total interest costs.