Home Affordability Calculator
Find how much house you can afford based on income, debts, and down payment.
Car loans, student loans, credit card minimums, etc.
Maximum Home Price
$345,128
Limited by your front-end (housing) ratio
What Is the Home Affordability Calculator?
Home Affordability Calculator Formula
Max Housing Payment = min(Income × Front-End%, Income × Back-End% − Other Debts)
Max Home Price solved so total monthly housing cost equals that limit
How Is the Home Affordability Calculator Calculated?
Lenders typically cap your housing payment (the "front-end ratio," commonly 28% of gross monthly income) and your total debt payments including housing (the "back-end ratio," commonly 36%). Whichever cap is more restrictive sets your maximum monthly housing budget, which is then worked backward — accounting for property tax, insurance, and HOA fees — into a maximum home price and loan amount.
Home Affordability Calculator Example
With a $100,000 annual income, $400 in other monthly debts, and a $60,000 down payment at 7% for 30 years, the 28/36 rule caps your monthly housing payment — which works backward into your maximum affordable home price after accounting for taxes, insurance, and the down payment.
How to Use the Home Affordability Calculator
Step 1
Enter your annual gross income and any other monthly debt payments.
Step 2
Enter your available down payment, expected mortgage rate, and loan term.
Step 3
Enter estimated property tax rate, insurance, and HOA fees for your target area.
Step 4
Adjust the front-end and back-end ratio caps if your lender uses different limits.
Benefits
- Uses the same 28/36 debt-to-income framework most mortgage lenders apply.
- Accounts for property tax, insurance, and HOA fees, not just the loan payment.
- Shows exactly which ratio (front-end or back-end) is limiting your affordability.
Common Home Affordability Calculator Scenarios
Scenario 1
Setting a realistic home price range before starting a house search.
Scenario 2
Understanding how paying off other debts could increase your home buying budget.
Scenario 3
Checking affordability across different down payment amounts.
Understanding Your Result
The maximum home price is an estimate of what a lender might approve based on standard debt-to-income guidelines — actual approval depends on your credit score, employment history, cash reserves, and the specific lender's underwriting criteria, which can be more or less conservative than these standard ratios.
Tips
- Paying down other monthly debts before applying can meaningfully increase your affordable home price if you're limited by the back-end ratio.
- A larger down payment reduces your loan amount and monthly payment, directly increasing affordability.
- Get pre-approved by an actual lender for a precise figure — this calculator gives a planning estimate, not a loan commitment.
Common Mistakes
- Forgetting to include property tax, insurance, and HOA fees, which can meaningfully reduce how much loan you can actually afford.
- Ignoring existing debts, which can be the real constraint on affordability even with a high income.
- Assuming the maximum affordable price is the same as a comfortable price — many buyers prefer to spend below their maximum for financial breathing room.
Frequently Asked Questions
What is the 28/36 rule?
It's a standard mortgage lending guideline suggesting housing costs shouldn't exceed 28% of gross monthly income, and total debt payments (including housing) shouldn't exceed 36% — many lenders use these or similar ratios to determine loan eligibility.
Why is my maximum home price limited by the back-end ratio?
This happens when your other monthly debts (car loans, student loans, credit cards) are high enough that your total debt payments hit the cap before your housing payment alone would reach the front-end limit.
Does this guarantee loan approval?
No, this is a planning estimate based on standard ratios — actual loan approval and amount depend on your credit score, employment history, assets, and the specific lender's requirements.
Does this account for private mortgage insurance (PMI)?
The insurance input here covers homeowners insurance. If your down payment is below 20%, factor in private mortgage insurance (PMI) separately, since lenders typically require it until you reach 20% equity.
What credit score do I need to qualify near this estimate?
Lenders generally reserve the most favorable ratios and rates for borrowers with strong credit (typically 700+), so a lower score may reduce your actual approved amount below this estimate.
Why do lenders use two different ratios (front-end and back-end)?
The front-end ratio caps housing costs alone, while the back-end ratio caps all debt payments combined — using both ensures affordability holds even if you have other loans beyond the mortgage.
Should I include a spouse's or co-borrower's income?
Yes, if applying jointly — combine both incomes and both sets of existing monthly debts to reflect what a lender would actually evaluate on a joint application.
How does a higher interest rate change my affordable home price?
A higher rate increases the monthly cost of the same loan amount, which lowers how much you can borrow within the same housing-payment cap — even a 1% rate increase can meaningfully reduce affordability.
Is it smart to spend right up to my maximum affordable price?
Not necessarily — many financial planners recommend leaving a buffer below your maximum for savings, emergencies, and future expenses rather than maximizing your mortgage.
Important Information
This is a planning estimate using standard debt-to-income guidelines, not a loan pre-approval — get a quote from an actual lender for a precise, binding figure.
Last updated: July 26, 2026