About this tool
Amortization Schedule Calculator is a free, in-browser tool that builds the complete payment-by-payment table for any fixed-rate loan: how much of each payment goes to interest, how much to principal, and the balance remaining after every period.
Each period's interest is the previous balance times the monthly rate (annual % ÷ 12 ÷ 100); the rest of the fixed payment reduces principal, so early payments are interest-heavy and later ones principal-heavy. Switch between a compact yearly view and the full monthly schedule with the view selector.
Use it to see exactly where a mortgage or car loan payment goes each month, or to check a lender's schedule — everything is computed locally in your browser with nothing uploaded.
Frequently asked questions
How is each row of the schedule computed?
Interest for period k is the previous balance times the monthly rate; the principal portion is the fixed payment minus that interest, and the new balance is the old balance minus the principal portion. The final payment is trimmed so the balance lands exactly on zero.
What is the difference between the yearly and monthly views?
The monthly view lists every payment. The yearly view sums the payments, interest and principal of each 12-month block and shows the balance at year end — handy for long loans like a 30-year mortgage.
Why does so little principal get paid early in the loan?
Because interest is charged on the full outstanding balance, which is largest at the start. As the balance falls, the interest share of the fixed payment shrinks and the principal share grows.
Does the schedule leave my browser?
No. The table is generated locally on your device; loan amounts and rates are never uploaded.