Home Affordability Calculator

A home affordability calculator answers the question most buyers start with: how much house can I actually afford? Lender pre-approval amounts often exceed what is comfortable, so this calculator frames affordability around debt-to-income ratios and the full monthly housing cost, including property taxes, insurance, and existing debt payments. The result is a maximum home price that leaves room for the rest of your financial life.

The calculator uses a 36% debt-to-income threshold as its constraint. It subtracts existing monthly debts from the maximum allowable monthly debt payment, then works backward to find the largest home price where the combined housing payment fits within that limit. The housing payment includes principal, interest, property taxes, and insurance. A binary search solves for the home price efficiently. The monthly breakdown visualization helps users see where their housing dollar actually goes, which is important for setting realistic expectations beyond the headline price.