Amortization is the process of paying off a debt through a series of fixed, regular payments made over a set period of time. Each payment is split into two parts: a portion covers the interest charge on the money you still owe, and the remainder reduces the outstanding principal. Because the balance shrinks a little with every payment, the interest portion gets smaller and smaller while the principal portion grows, even though the total payment amount stays the same for the life of the loan. This calculator lets you enter a loan amount, term, and interest rate, then instantly builds the full year-by-year and month-by-month payoff schedule so you can see exactly how your balance disappears over time.
Mortgages, auto loans, student loans, and most personal loans all follow this same repayment structure, which is why an amortization calculator is one of the most useful tools you can have before signing any loan agreement. Seeing the schedule in advance helps you understand how much of your early payments actually goes toward interest rather than reducing what you owe, and it shows how making even small extra payments toward the principal can shorten your loan term and save you a meaningful amount of money in total interest.
How to use this amortization calculator
- Enter the loan amount — the total sum you are borrowing (or currently owe).
- Set the loan term — the number of years and months you have to repay it.
- Enter the annual interest rate — the yearly percentage rate charged on the loan.
- Optional: add extra payments — tick the box and enter an amount to see how paying more each month shortens your payoff time.
- Click Calculate — the tool instantly shows your fixed monthly payment, a pie chart of principal versus interest, the total amount paid, and a complete annual and monthly amortization schedule with a balance chart.
Common uses of this tool
- Comparing how different loan terms (e.g. 15 vs 30 years) change your monthly payment and total interest.
- Testing how a higher or lower interest rate affects affordability before you apply for a mortgage or car loan.
- Seeing exactly how much of an early payment goes to interest versus principal.
- Planning extra principal payments to pay off a loan faster and reduce total interest paid.
- Generating a printable payment schedule for budgeting, tax, or accounting purposes.
Example
Frequently Asked Questions
What is an amortization schedule?
It's a table that breaks down every payment over the life of a loan into its interest and principal components, along with the remaining balance after each payment, so you can track exactly how the loan is paid off over time.
Why is more interest paid at the start of a loan?
Interest is calculated on the outstanding balance. Early on, the balance is at its highest, so the interest portion of each payment is largest. As the balance falls, the interest charged falls too, and more of each fixed payment goes toward principal.
Do extra payments actually save money?
Yes. Any extra amount paid above the required monthly payment goes directly toward reducing the principal, which lowers the interest charged on all future payments and can shorten the loan term significantly.
Are credit cards amortized?
No. Credit cards are revolving debt with a balance that can be carried and varied month to month, so they don't follow a fixed amortization schedule the way an installment loan does.
Does this calculator account for taxes, insurance, or fees?
No, it calculates principal and interest only. Property taxes, homeowners insurance, PMI, and lender fees are not included and should be added separately when budgeting for a mortgage.
Can I use this for loans other than mortgages?
Yes. The same fixed-payment amortization math applies to car loans, student loans, and most personal loans, as long as the loan has a fixed rate and a fixed term.