How to Use This Affordability Calculator
Finding out exactly how much house you can afford is the most critical step before contacting a real estate agent. Our home affordability calculator uses the exact mathematical formulas that bank underwriters use to approve or deny your mortgage application.
The 28/36 Rule Explained
When you input your income and debts, this tool automatically tests your finances against the industry-standard "28/36 Rule":
- The 28% Rule (Front-End Ratio): Lenders dictate that your total monthly housing payment (including Principal, Interest, Property Taxes, and Insurance—known as PITI) should not exceed 28% of your gross monthly income.
- The 36% Rule (Back-End Ratio): Furthermore, your total debt load (which includes your new mortgage payment PLUS your car loans, student loans, and credit card minimums) should not exceed 36% of your gross monthly income.
Why Use the Stress Test Mode?
The standard 28/36 rule tells you what the bank thinks you can afford, but "bank-approved" is very different from "budget-safe." We built the Stress Test mode to protect your financial future. By inputting a reduced income (e.g., simulating a job loss or pay cut) and your emergency savings, you can see if your fixed monthly costs would force you into foreclosure during a crisis.
Tips to Increase Your Buying Power
If the calculator shows a lower purchase price than you hoped, you can mathematically increase your budget by:
- Paying Down Debt: Eliminating a $400/month car payment dramatically lowers your DTI, allowing you to borrow tens of thousands of dollars more for your home.
- Increasing Your Down Payment: Every extra dollar you put down reduces your loan amount, lowering your monthly PITI.
- Shopping for Better Rates: Even a 0.5% drop in your mortgage interest rate can unlock massive purchasing power.