Amortization Schedule Calculator

Follow these steps to generate your personalized loan amortization schedule using this calculator:

1. Enter the Loan Amount — Type the total amount you are borrowing. For a mortgage, this is the home price minus your down payment. For example, if you are buying a $350,000 home with 20% down, enter $280,000. For auto loans, personal loans, or student loans, enter the total financed amount.
2. Set the Annual Interest Rate — Input the annual percentage rate (APR) quoted by your lender. Use the step buttons to adjust in 0.125% increments, matching how lenders typically price rates. As of early 2026, average 30-year mortgage rates are around 6.5%, while auto loan rates range from 5% to 9% depending on credit score and term.
3. Choose the Loan Term — Select your repayment period: 10, 15, 20, 25, or 30 years. Shorter terms mean higher monthly payments but dramatically less total interest. A 15-year mortgage at 6.5% saves over $190,000 in interest compared to a 30-year term on a $280,000 loan.
4. Select the Start Month — Choose the month your first payment begins. This determines your projected payoff date and helps you plan your budget timeline.
5. Add Extra Monthly Payments (Optional) — Enter any additional amount you plan to pay each month beyond the required minimum. This extra money goes directly toward reducing your principal balance, accelerating your payoff and reducing total interest.

After calculating, review the six result fields:

• Monthly Payment — Your base payment of principal and interest each month.
• Total Interest Paid — The cumulative interest over the full loan life.
• Total Cost of Loan — Principal plus all interest combined.
• Payoff Date — The month and year your loan will be fully repaid.
• Interest Saved — How much less interest you pay thanks to extra payments.
• Time Saved — How many months or years sooner you pay off the loan.

The interactive chart shows how the principal and interest portions of your payment shift over time, along with your declining balance. Run multiple scenarios to find the optimal strategy for your budget.

An amortization schedule is a complete table of loan payments showing exactly how each monthly payment is divided between principal and interest over the life of the loan. The word "amortization" comes from the Latin admortire, meaning "to kill" — in financial terms, you are gradually killing off the debt with each payment. This amortization calculator generates your full schedule instantly, giving you a clear picture of where every dollar goes from your first payment to your last.

Amortization has been a cornerstone of lending since the early 20th century, when the U.S. government introduced standardized self-amortizing mortgages through the Federal Housing Administration in the 1930s. Before that, most home loans were short-term balloon mortgages that required a large lump-sum payment at maturity — a structure that contributed to widespread foreclosures during the Great Depression. The modern amortized loan, with its predictable equal monthly payments, revolutionized homeownership and remains the dominant structure for mortgages, auto loans, personal loans, and student loans today.

There are several types of amortized loans you may encounter. Fixed-rate loans keep the same interest rate and payment amount for the entire term, making them the most predictable option. Adjustable-rate loans (ARMs) start with a lower introductory rate that resets periodically, which changes the amortization schedule at each adjustment. Auto loans typically amortize over 3 to 7 years, while personal loans usually range from 1 to 5 years. Student loans may offer income-driven repayment plans that alter the standard amortization schedule.

Understanding your amortization schedule matters because it reveals the true cost of borrowing. As of early 2026, with average 30-year mortgage rates in the mid-6% range, a $280,000 loan generates over $350,000 in total interest over 30 years — more than the original loan amount. Knowing this empowers you to make strategic decisions: choosing a shorter term, making extra payments, or refinancing when rates drop. Even a small extra monthly payment can save tens of thousands of dollars and shave years off your loan. Use our mortgage calculator to compare different down payment and rate scenarios before generating your amortization schedule.

Disclaimer: This amortization calculator provides estimates for educational purposes only. It does not constitute financial advice. Consult a qualified lender or financial advisor before making borrowing decisions.

The standard amortization formula calculates the fixed monthly payment required to fully repay a loan over a set number of periods at a constant interest rate:

M = P × [r(1 + r)n] / [(1 + r)n − 1]

Once you know M, each monthly payment is split between interest and principal as follows:

• Interest portion = Remaining Balance × r
• Principal portion = M − Interest portion
• New Balance = Previous Balance − Principal portion

This process repeats every month. Because the balance decreases with each payment, the interest portion shrinks and the principal portion grows — even though the total payment M stays constant. This is the key insight behind amortization: early payments are interest-heavy, while later payments are principal-heavy.

For example, on a $280,000 loan at 6.5% over 30 years, the monthly payment is approximately $1,770. The very first payment breaks down to about $1,517 in interest and only $253 in principal. By payment 180 (the halfway point), the split is roughly $879 interest and $891 principal. The final payment is nearly all principal. Over the full 30 years, you pay approximately $357,300 in total interest — more than the original loan amount.

When extra payments are applied, they reduce the principal balance immediately, which decreases interest on all subsequent payments. This creates a compounding savings effect, which is why even small extra payments early in the loan term can save a disproportionately large amount of money over the full schedule.

Below are three worked examples demonstrating how the amortization schedule calculator handles common loan scenarios.

Example 1: Standard 30-Year Mortgage ($280,000 at 6.5%)

• Loan amount: $280,000
• Interest rate: 6.5% (monthly rate: 0.005417)
• Term: 30 years (360 payments)
• Extra payment: $0

Using the amortization formula:

M = 280,000 × [0.005417 × (1.005417)360] / [(1.005417)360 − 1]

Calculate (1.005417)³⁶⁰ = 6.9913. Then:

M = 280,000 × [0.005417 × 6.9913] / [6.9913 − 1] = 280,000 × 0.03788 / 5.9913 = 280,000 × 0.006321 ≈ $1,770

Monthly payment: $1,770. Total interest over 30 years: approximately $357,300. Total cost: $637,300. First payment breakdown: $1,517 interest / $253 principal. Payoff date starting January 2026: January 2056.

Example 2: 15-Year vs. 30-Year Comparison ($280,000 at 6.5%)

The 15-year term costs an extra $671/month but saves nearly $197,960 in total interest and pays off the loan 15 years sooner. This is one of the most impactful financial decisions a borrower can make. Use our mortgage calculator to compare these scenarios with different down payments and home prices.

Example 3: Impact of $200/Month Extra Payments ($280,000 at 6.5%, 30-Year)

• Base monthly payment: $1,770
• Extra payment: $200/month
• Effective monthly payment: $1,970

With $200 in extra monthly payments applied to principal:

An extra $200 per month saves approximately $94,700 in interest and shaves about 6 years and 7 months off the loan. The total extra cash invested is roughly $56,200 (200 × 281 months), yielding a return of nearly $94,700 in saved interest — an exceptional guaranteed return. For a deeper analysis of early payoff strategies, try our loan payoff calculator.