Calculate monthly payments, total interest, and view full amortization schedules.
Checks that loan amount is a positive number, interest rate is non-negative, and term is at least 1 month. All fields must be filled before calculation.
Validates the annual interest rate falls within a reasonable range (0%–50%). Rates outside this range trigger a warning as they are uncommon for most loan types.
Ensures the loan term is between 1 and 480 months (40 years). Terms exceeding 30 years are flagged as unusually long.
Computes the fixed monthly payment using the standard amortization formula: M = P × r(1+r)^n / ((1+r)^n − 1). Also derives total interest and total cost.
Full payment-by-payment breakdown showing principal, interest, and remaining balance for every month. Exportable to CSV.
| # | Payment | Principal | Interest | Balance |
|---|