House Affordability Calculator
Determine your home purchasing power using professional lending standards.
House Affordability Calculator
Before falling in love with a home, it helps to know what price range makes sense for your finances. This calculator tells you how much house you can comfortably afford based on your real income and debts — not just a bank's maximum approval.
What Does This Calculator Do?
It estimates the maximum home price you can afford by analyzing your gross income, monthly debts, down payment, interest rate, and standard lending guidelines (like the 28/36 rule).
How to Use This Calculator
- Enter your gross annual income (before taxes).
- Enter your monthly debt payments (car loans, student loans, credit cards).
- Enter your available down payment.
- Enter the current mortgage interest rate.
- Enter the loan term (typically 30 years).
- Click Calculate to see your affordable price range.
The 28/36 Rule Explained
Most lenders use the 28/36 rule:
- 28% rule: Your monthly housing costs (mortgage, taxes, insurance) should not exceed 28% of your gross monthly income.
- 36% rule: Your total monthly debt payments (housing + all other debts) should not exceed 36% of gross monthly income.
The lower of the two limits is typically what determines your maximum mortgage payment.
Example Calculation
Annual income: $85,000 | Monthly debts: $400 | Down payment: $40,000 | Rate: 7%
- Monthly income: $85,000 ÷ 12 = $7,083
- 28% limit: $7,083 × 0.28 = $1,983/month for housing
- 36% limit: $7,083 × 0.36 = $2,550 − $400 debts = $2,150/month for housing
- Lower limit applies: ~$1,983/month
- At 7% for 30 years, that payment supports a loan of ~$297,000
- Add $40,000 down payment: Affordable home price ≈ $337,000
Why Use This Calculator?
Banks will often approve you for more than you should comfortably borrow. Knowing your own affordability limit — not just the lender's — protects you from becoming "house poor" and ensures your mortgage fits your lifestyle, not just your credit score.
Common Mistakes to Avoid
- Using net income instead of gross — lenders calculate ratios on pre-tax income.
- Forgetting property taxes and insurance — these add hundreds per month to your actual housing cost.
- Ignoring HOA fees — condos and planned communities often charge $200–$600/month.
- Stretching to the max — just because you can afford it on paper doesn't mean you should borrow the maximum.
Frequently Asked Questions
How much income do I need to buy a $400,000 house?
At 7% for 30 years with 10% down, your monthly payment would be around $2,395. Using the 28% rule, you'd need a gross monthly income of about $8,554 ($102,648/year). Add in taxes, insurance, and your other debts, and the number rises further.
Does my credit score affect affordability?
Yes. A lower credit score typically means a higher interest rate, which reduces how much home you can afford with the same income. Improving your score before buying can meaningfully increase your purchasing power.
Should I buy at the top of my budget?
Generally not. Aim to buy below your maximum. Unexpected expenses — repairs, job changes, medical bills — happen. Leaving room in your budget makes homeownership far less stressful.
What if I have no down payment?
FHA loans require as little as 3.5% down. Check our FHA Loan Calculator or explore VA loans with our VA Mortgage Calculator if you qualify.
How does my debt-to-income ratio affect my approval?
Most lenders want your total DTI under 43%. See our Debt-to-Income Ratio Calculator to check yours before applying.
Conclusion
Knowing what you can truly afford — before you start house hunting — keeps emotions from overriding financial sense. Use this calculator as your starting point, then compare it with what lenders offer to find your real sweet spot.
Related tools: Mortgage Calculator | Down Payment Calculator | Debt Ratio Calculator | Rent vs. Buy Calculator
Mortgage Tip
Don't forget property taxes and insurance! These "hidden" housing costs can account for 20-30% of your total monthly obligation in high-tax areas.
