How affordability is calculated
We use the classic 28/36 rule as the basis for the three tiers. The conservative tier limits housing costs (PITI + PMI) to 28% of gross income. The moderate tier allows total debts including housing to reach 36% of gross income. The stretch tier pushes that to 43% — the maximum allowed for most qualified mortgages.
For each tier we solve for the home price whose monthly PITI matches the budget, given your rate, term, property tax %, insurance, and down payment. PMI is automatically included at 0.5% APR if your down payment is less than 20% of the resulting home price.
Want a deeper walkthrough? Read How much house can I afford? — or jump to the full mortgage calculator once you have a target price in mind.