Loan Amortization Calculator – View Payment Schedule & Interest Breakdown (2026)

To calculate the monthly payment for a fixed-rate loan, our calculator uses the standard amortization formula. This formula ensures that by the end of your loan term, the balance reaches zero through a series of equal payments.

In this formula, the variables represent:

• M: Your total monthly payment (Principal + Interest).
• P: The Principal loan amount (the initial amount you borrowed).
• r: The monthly interest rate. To find this, divide your annual interest rate by 12 (e.g., 6.5% / 12 = 0.005416).
• n: The total number of payments (months) over the life of the loan (e.g., 30 years = 360 payments).

Amortization may seem complex, but it follows a very logical mathematical path. When you take out a loan with a fixed payment, each installment is divided between paying off the interest charged by the lender and reducing your original loan balance (the principal).

Here is the critical concept: Interest is always calculated based on your remaining balance.

In the first month, your balance is at its highest, so the interest charge is also at its peak. Since your total payment is fixed, this leaves less room for principal reduction. However, as you chip away at the principal, the next month's interest is calculated on a slightly smaller balance. This means the interest portion decreases each month, allowing a larger percentage of your payment to go toward the principal. This accelerating effect is why your balance drops slowly at first but accelerates significantly toward the end of the loan term.

An amortization schedule is a complete table of periodic loan payments. It provides a month-by-month (or year-by-year) breakdown of how your money is being used. A standard schedule includes:

• Payment Number: The chronological order of your payments.
• Interest Paid: The amount of that specific payment that goes to the lender as profit.
• Principal Paid: The amount that directly reduces your debt balance.
• Remaining Balance: Your new total debt after the payment is applied.

Using an amortization schedule helps users understand their loan payoff timeline and visualize how much "equity" (the portion of the asset you truly own) they are building over time. It is an essential tool for budgeting and long-term financial planning.

One of the most effective ways to save money on a loan is by making extra monthly payments. Because interest is calculated on your remaining balance, any dollar you pay above the required amount goes 100% toward reducing your principal.

By reducing the principal faster, you effectively "skip" forward in the amortization schedule. This has two massive benefits:

• Shortens the Loan Term: You will pay off the loan months or even years earlier than planned.
• Saves Massive Interest: Since you have a smaller balance for the remainder of the loan, the total interest charged over the life of the loan drops significantly.

Even a small extra payment, like $100 per month on a $250,000 mortgage, can save you tens of thousands of dollars in interest and shave years off your payoff date.