There is also a three-digit code number assigned to each currency, in the same manner as there is also a three-digit code number assigned to each country as part of ISO 3166. This numeric code is usually the same as the ISO 3166-1 numeric code.
This calculator uses these guidelines for determining how much house you can afford, which are similar to common underwriting criteria that mortgage lenders use. 1  Your total mortgage payment should be no more than 28 percent of your gross monthly income.
A general rule is that you usually can qualify for a mortgage loan of two to two and one-half times your household's income. For example, if your family has an income of $30,000 a year, you can usually qualify for a mortgage of $60,000 to $75,000.