Mortgage calculator

Principal and interest use the fixed-rate payment formula M = P × r(1 + r)^n / ((1 + r)^n − 1), where P is the loan amount, r the annual rate divided by 12, and n the number of monthly payments. Property tax, insurance, PMI and HOA are added to that as monthly amounts.

PMI is estimated at 0.75% of the loan per year when the loan is more than 80% of the home price; type your own rate to replace the estimate. It is shown as a flat monthly amount, though lenders normally drop it once enough of the loan is paid off. Biweekly payments are treated as one extra monthly payment a year, spread across the 12 months.