How amortized loan payments are calculated
A fixed-rate amortized loan spreads repayment across equal monthly installments. Early payments contain a larger interest share because interest is calculated on the higher outstanding balance; over time, more of each payment goes toward principal.
Toolmera uses the standard fixed-payment formula M = P × r(1+r)^n ÷ ((1+r)^n − 1), where P is principal, r is the monthly interest rate and n is the number of monthly payments.
Monthly rateAnnual rate ÷ 12 ÷ 100
Number of paymentsYears × 12, or entered months
Zero-interest casePayment = Principal ÷ number of payments
What changes the total cost of a loan
A higher principal or higher interest rate increases both the payment and total interest. A longer term usually lowers the monthly payment but keeps the balance outstanding for longer, which can increase lifetime interest.
The current calculator models a constant fixed rate and scheduled monthly payments. It does not include lender fees, taxes, insurance, prepayments or variable-rate changes.
Reading the amortization schedule
The schedule separates every payment into principal and interest and shows the remaining balance. Use the yearly view for a compact overview or switch to monthly detail to inspect each payment period.
Because the calculator is currency-agnostic, the numbers can represent USD, EUR, GBP, CAD, AUD or another currency as long as all monetary inputs use the same unit.