Amortization Calculator

Visualize your loan payoff timeline. Enter your loan details below to generate a month-by-month schedule showing principal vs. interest payments.

Loan amount

Annual interest rate (%)

Term (years)

Payments per year

Weekly, bi-weekly, and quarterly schedules are estimates. Most loans use monthly compounding.

Extra payment per period (optional)

Start date (optional)

Usage Tip: Use the "Extra Payment" field to see how small additional contributions can reduce your total interest paid and shorten the loan term.

Disclaimer: Results are estimates for educational purposes. Actual loan terms may vary based on lender policies, fees, and compounding methods.

Understanding Your Amortization Schedule

An amortization schedule is more than just a list of payments; it is a roadmap of your debt. While your total monthly payment might stay the same for a fixed-rate loan, the breakdown of that payment changes drastically over time. This tool helps you visualize that shift—from paying mostly interest in the early years to paying mostly principal in the later years.

When Should You Use This Tool?

This calculator is particularly useful in the following scenarios:

Planning a Mortgage: Before signing a 30-year commitment, use this tool to see exactly how much interest you will pay over the life of the loan.
Refinancing Analysis: If you are considering refinancing, compare your current schedule against a new one to ensure the long-term savings justify the closing costs.
Debt Freedom Strategy: If you have an auto loan or personal loan, use the "Extra Payment" feature to calculate how quickly you can become debt-free by adding just $50 or $100 to your monthly payment.

How Amortization Works

The math behind amortization ensures that the lender receives their interest upfront. Here is the basic logic:

Interest Calculation: Every period (usually monthly), the interest rate is applied to your current remaining balance.
Principal Reduction: Your fixed payment covers that interest first. Whatever is left over is applied to the principal balance.
The Shift: As the principal balance drops, the interest charge drops with it. This leaves more of your fixed payment available to reduce the principal further in the next month.

Features of This Calculator

We designed this tool to be simple yet comprehensive for personal financial planning:

Flexible Payment Frequencies: Calculate for Monthly, Bi-weekly, Weekly, Quarterly, or Annual payments. Bi-weekly payments are a popular strategy to make one extra full payment per year effortlessly.
Extra Payment Simulation: The most powerful feature of this tool. Inputting an extra payment amount immediately updates the schedule, showing you the exact date you will be debt-free.
Export & Print: Save your schedule as a CSV file for Excel analysis or print it out to keep a physical record of your progress.

Frequently Asked Questions

Why is the interest portion so high at the beginning?

Interest is always calculated on the amount you currently owe. At the start of a loan, your balance is at its highest, so the interest charge is also at its peak. As you pay down the balance, the interest portion of your payment naturally decreases.

Does this calculator account for property taxes and insurance?

No. This calculator computes "Principal and Interest" (P&I) only. For a mortgage, your actual monthly bill will likely be higher because it often includes escrow payments for property taxes and homeowners insurance. You should add those estimated costs to the result shown here for a complete budget picture.

How accurate is this schedule?

This tool uses standard mathematical formulas for compound interest amortization. However, real-world lenders may differ slightly in how they handle rounding, day-counts, or payment holidays. Treat this schedule as a close estimate rather than a penny-perfect guarantee.

Last Updated: January 2026. This tool is free to use and does not require registration.