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Mortgage Affordability Calculator

Use this calculator to estimate how much home you can realistically afford based on your income, existing debts, down payment, and current interest rates. This tool uses standard lender debt-to-income (DTI) ratios to help you find a comfortable price range.

Your total income before taxes.
Car loans, student loans, minimum credit card payments, etc.

Understanding Your Mortgage Affordability

Determining "how much house can I afford" is the critical first step in the homebuying process. Lenders don't just look at your salary; they analyze your entire financial profile, focusing heavily on your Debt-to-Income (DTI) ratio.

The Role of DTI Ratios

Your DTI ratio is the percentage of your gross monthly income that goes toward debt payments. Lenders use two types:

  • Front-End Ratio: The percentage of income that goes specifically toward housing costs (mortgage principal, interest, taxes, and insurance). A common guideline is to keep this under 28%.
  • Back-End Ratio: The percentage of income that goes toward all debt, including housing costs plus student loans, car payments, and credit cards. Lenders generally prefer this to be under 36%, though some programs (like FHA) allow higher ratios.

This calculator uses a conservative 36% back-end ratio to estimate a comfortable maximum payment. If your existing monthly debts are high, it significantly reduces the amount left over for a mortgage payment.

Factors Influencing Affordability

Besides income and debt, several other factors change your purchasing power:

  • Interest Rates: Even a 1% increase in interest rates can reduce your buying power by tens of thousands of dollars because more of your monthly payment goes toward interest rather than principal.
  • Down Payment: A larger down payment directly increases the price of the home you can buy because it reduces the loan amount needed.
  • Property Taxes & Insurance: These are mandatory monthly costs included in your DTI calculation. High property taxes in certain areas can significantly lower the maximum loan amount you qualify for.

Example Scenario

Imagine a household earning $90,000 annually with $500 in monthly debts (car loan and credit cards). They have $35,000 saved for a down payment. With a 30-year fixed-rate mortgage at 6.5% interest, and estimating $4,000/year for taxes and insurance:

The calculator estimates their maximum affordable home price would be approximately $315,000, with a total estimated monthly payment around $2,200. This keeps their total debt obligations within standard lending guidelines.

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