Amortization Calculator
Detailed installment schedule with extra principal payments.
How this calculator works
Each row shows interest = opening balance × annual nominal rate / payments per year and principal = actual payment − interest.
Calculation assumptions
Scheduled payment dates are calculated from the first due-date reference. Actual banks may use different day counts or holiday rules.
Example
A 0% loan of $12,000 repaid in 12 monthly installments has $1,000 principal in every row.
For planning only. Not financial advice or a lender quote.
Frequently asked questions
Are my financial numbers stored or sent to your server?
No. Inputs remain in browser memory. Only language, currency, theme and recently used calculator IDs may be saved on this device. Exports are created locally.
Why can a lender’s quote differ?
Our calculations use the assumptions shown here. A lender may apply different dates, daily interest, fees, taxes, insurance or rounding.
Can I select a different currency?
Yes. Currency selection changes only the symbols and number formatting; no exchange-rate conversion occurs.