A method for automatically calculating a monthly housing expense payment includes reading data and calculating a really close approximation to the monthly housing expense payment for a property or plurality of properties, by incorporating the principal and interest payment for different loan types or the loan type a specific buyer would have, incorporating the actual property tax, an estimation of the property insurance percentage, the mortgage insurance percentage premium if applicable, and community association fees, if applicable.The method generates a more realistic projection of a buyer' s capacity to pay all the fees the bank will require to be paid for at least one property by integrating accurate data, actual costs and estimations of those that cannot be known ahead of buying real estate of the different elements that compose the monthly housing expense payment but are not normally calculated or displayed when viewing or considering buying a property.