Affordability guardrails

The calculator compares two payment limits and uses the stricter one. Existing debts only affect the DTI-based cap.

Monthly payment mix

This breakdown shows which parts of the monthly housing cost are consuming the budget ceiling.

What is a house affordability calculator?

A house affordability calculator estimates the purchase price that fits your current finances before you ask a lender for a preapproval. Instead of starting with the home price and then seeing the payment, this tool starts with your income limits and backs into the largest monthly housing payment that still fits common underwriting rules.

That makes it useful for narrowing your search range, deciding whether to save a larger down payment, and comparing how taxes, PMI, HOA dues, or a higher rate can change your price ceiling. Once you know the rough range, move into the Mortgage Calculator for a specific property or use the Finance Calculator for a wider monthly cash-flow check.

How this calculator works

First, it converts annual income into gross monthly income and calculates two affordability caps: a housing-only cap and a total debt-to-income cap after subtracting your existing monthly debts. The tool then uses the smaller cap as the maximum monthly housing budget.

Second, it models a mortgage payment using your rate, term, and down payment. Property tax, insurance, HOA, and PMI are added on top. Finally, it runs a search to find the highest home price whose full monthly ownership cost still stays inside the budget. If you want to inspect the loan payment separately, continue into the Payment Calculator or the Amortization Calculator.