Mortgage Amortization Calculator
Understanding Mortgage Amortization
A mortgage amortization calculator helps homeowners and buyers break down each monthly payment into principal and interest over the life of the loan. Unlike a simple loan calculator, an amortization schedule shows exactly how much of your payment reduces the actual loan balance and how much goes toward interest — month by month.
What Is an Amortization Schedule?
An amortization schedule is a table that lists every periodic payment on a loan over time. For a fixed‑rate mortgage, each payment is the same total amount, but the portion applied to principal gradually increases while the interest portion decreases. This happens because interest is calculated on the remaining balance, which shrinks with every payment.
How the Calculator Works
Our tool uses the standard amortization formula:
M = P × [ r(1 + r)n ] / [ (1 + r)n – 1 ]
Where M is your monthly payment, P is the loan amount, r is the monthly interest rate (annual rate ÷ 12), and n is the total number of payments (loan term in years × 12). The schedule then computes the interest for each period and subtracts it from the payment to find the principal reduction.
Why Use a Mortgage Amortization Calculator?
- Plan extra payments: See how additional principal payments can shorten the loan term and save interest.
- Compare loan offers: Adjust the interest rate or term to find the most affordable option.
- Understand true cost: Total interest paid can often exceed the original loan amount — the schedule makes that crystal clear.
- Track equity build‑up: Know exactly when you’ll reach 20% equity to cancel private mortgage insurance (PMI).
Tips for Using the Tool
Enter your loan amount, annual interest rate, and repayment term in years. You can also select the month you plan to start payments (default is the current month). Click “Calculate” to instantly see your monthly payment, total repayment amount, and total interest. The amortization table shows the first 12 payments by default; click “Show Full Schedule” to view the entire loan timeline.
Note: This calculator assumes a fixed interest rate and consistent monthly payments. It does not account for taxes, insurance, or possible rate adjustments. Always consult with a financial advisor for personalized advice.
