This amortization calculator builds a complete loan amortization schedule so you can see exactly how each payment splits between principal and interest. Enter your loan amount, interest rate, term, and payment frequency to calculate your monthly, biweekly, or weekly loan payment, then explore the full schedule and see how extra payments toward principal can lower your interest and shorten your payoff timeline — useful whether you’re running numbers on a mortgage, auto loan, or personal loan.
Your results
Based on the loan details you entered.
Amortization schedule
Every payment from your first period to full payoff, with principal, interest, and remaining balance.
| # | Payment Date | Beginning Balance | Scheduled Payment | Extra Payment | Principal Paid | Interest Paid | Ending Balance |
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How to Use the Amortization Calculator
- Enter your loan amount, interest rate, and term in years or months to match the loan you’re comparing.
- Choose a payment frequency — monthly, biweekly, or weekly — to calculate loan amortization on your actual repayment schedule.
- Add optional extra payments, recurring or one-time, to see how they accelerate payoff and cut interest.
- Read your results: payment amount, total interest, total paid, payoff date, and the full amortization schedule below update instantly.
What Is Loan Amortization?
Loan amortization is the process of paying off a debt over time through regular, fixed payments. Each payment covers the interest owed for that period plus a portion of the original principal, so the balance is gradually reduced to zero by the end of the loan term.
A loan amortization calculator models this process automatically, showing exactly how a monthly loan payment calculator or biweekly repayment plan pays down principal and interest over the full life of the loan.
How an Amortization Schedule Works
An amortization schedule calculator lists every payment from the first to the last, showing the beginning balance, the interest and principal portions of that payment, and the ending balance. Interest is calculated on the remaining balance each period, so as the balance drops, so does the interest charged — which means more of each fixed payment goes toward principal as the loan matures.
This calculator generates a full loan amortization schedule for mortgages, auto loans, and personal loans alike, so you can see the payment-by-payment path to payoff rather than just a single monthly figure.
Principal vs. Interest
Principal is the part of your payment that reduces the amount you borrowed. Interest is the cost of borrowing, calculated on the balance still owed.
Early on, a larger share of each payment goes toward interest because the balance is highest. As the loan progresses, the interest and principal calculator shows the split shifting steadily toward principal, until the final payments are almost entirely principal.
How Extra Payments Affect Loan Amortization
Using this calculator as an extra payment amortization calculator shows how additional money applied to principal — whether recurring or a one-time lump sum — reduces the balance interest is charged on for every remaining period.
The result is less total interest paid and a shorter loan term, which is why extra payments are one of the most effective early loan payoff strategies. This tool works as a loan payoff calculator by comparing your original schedule against one with extra payments applied.
Types of Loans You Can Amortize
This calculator works as a general-purpose loan repayment calculator for any fixed-rate installment loan. Common uses include:
Amortization Calculator FAQs
How does an amortization calculator work?
An amortization calculator uses your loan amount, interest rate, term, and payment frequency to work out a fixed payment amount, then splits every payment into interest and principal based on the remaining balance. It repeats this for every period to build a complete amortization schedule until the balance reaches zero.
How do I calculate my loan amortization?
Enter your loan amount, interest rate, term, start date, and payment frequency into the calculator. It applies a standard amortization formula to determine your payment, then generates a full loan amortization schedule showing principal, interest, and balance for each payment.
What is an amortization schedule?
An amortization schedule is a table listing every payment over the life of a loan, showing the payment date, beginning balance, portion paid toward interest, portion paid toward principal, and ending balance for each period.
How is loan interest calculated?
Interest for each payment period is calculated by multiplying the remaining loan balance by the periodic interest rate, which is the annual interest rate divided by the number of payments per year. As the balance falls, the interest portion of each payment shrinks.
Does making extra payments reduce loan interest?
Yes. Extra payments reduce your principal balance faster, which lowers the interest charged in every future period. This can significantly cut total interest paid and shorten the overall loan term.
How can I pay off my loan early?
Common ways to pay off a loan early include making recurring extra payments toward principal, making a one-time lump-sum payment, switching to a more frequent payment schedule such as biweekly, or refinancing to a shorter term.
What is the difference between principal and interest?
Principal is the portion of a payment that reduces the amount originally borrowed. Interest is the cost of borrowing, calculated on the remaining balance. Early in a loan, more of each payment goes to interest; later, more goes to principal.
This calculator provides estimates for informational purposes only and does not constitute financial or lending advice. Actual loan amortization, payment amounts, and total costs will vary by lender, fees, rounding conventions, and loan program. Consult a licensed lender for a formal loan estimate.