Calculate monthly payments, total interest, and full amortization schedule for any fixed-rate mortgage.
Validates that the loan principal is a positive number between $1,000 and $100,000,000.
Validates that the annual interest rate is between 0.01% and 50%.
Validates that the loan term is between 1 and 50 years.
Computes the fixed monthly payment using the standard amortization formula: M = P[r(1+r)^n] / [(1+r)^n – 1].
Calculates total interest paid over the life of the loan and the interest-to-principal ratio.