Home Affordability Calculator
The average US household spends 26% of income on housing but lenders cap approval at 28% according to the CFPB. Enter your income, down payment, debts, and monthly expenses to calculate your maximum affordable home price and mortgage amount using the 28/36 rule.
Last updated: April 2026
Home affordability determines the maximum home price you can purchase based on your income, down payment, debts, and credit profile. Max Housing Payment = Gross Monthly Income × 0.28. Down payment as % of price typically target 20%+.
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What is Home Affordability?
Home affordability determines the maximum home price you can purchase based on your income, down payment, debts, and credit profile. US lenders use the 28/36 rule (housing cost under 28% of gross, total debts under 36%) plus DTI caps from Fannie Mae, Freddie Mac, FHA, and VA. Check your monthly costs with the Mortgage Calculator and upfront costs with the Closing Costs Calculator.
The Formula
Max Housing Payment = Gross Monthly Income × 0.28 Max Mortgage = Present Value of (Max Housing Payment − Tax − Insurance − PMI − HOA) at current rate over term Max Home Price = Max Mortgage + Down Payment
Lenders also cap total DTI (mortgage + car loans + student loans + credit cards) at 36-45%. Your actual qualification may be lower than the 28% rule if you have other debts.
Worked Example
A buyer in Charlotte, NC earns $90,000/year and has saved a $40,000 down payment. They have $400/month in student loans and a $300 car payment.
- Gross monthly income = $90,000 ÷ 12 = $7,500
- Max housing payment (28%) = $7,500 × 0.28 = $2,100
- Back out $250 taxes + $130 insurance → $1,720 available for P&I
- At 6.75% 30-year, $1,720/mo supports a mortgage of ~$265,000
- Max home price = $265,000 + $40,000 = $305,000 (13% down)
- Closing costs (2.5%) = ~$7,600
📌 Maximum affordable home: $305,000 with 13% down — the buyer still needs roughly $7,600 in closing costs and 3-6 months reserves on top of the down payment.
Why This Matters
Realistic expectations
Knowing your maximum budget before house hunting saves weeks of touring homes you cannot qualify for. It also strengthens your offer position — US sellers and listing agents expect a pre-approval letter before presenting offers.
Joint income advantage
Joint applicants can combine incomes, dramatically increasing borrowing power. A couple earning $70,000 + $60,000 can afford roughly $440,000 vs one earning $70,000 alone at $240,000. Both incomes are underwritten.
Common Mistakes
❌ Borrowing the maximum available
Lenders may qualify you at 45% DTI, but personal finance advisors recommend keeping housing under 25% of take-home pay. Maximum borrowing leaves zero buffer for property tax reassessments, roof replacements, or job loss. The median US homeowner spends 22% of income on housing (Census ACS data).
❌ Forgetting closing costs and reserves
Beyond the down payment, you need 2-5% of purchase price in closing costs and 3-6 months of reserves to qualify for most loans. On a $400,000 home with 10% down, that is $40,000 down + $10,000 closing + $18,000 reserves = $68,000 cash.
Industry Benchmarks
| Category | Good | Average | Poor |
|---|---|---|---|
| Down payment as % of price | 20%+ | 8-20% | Below 5% |
| Debt-to-income ratio | Below 30% | 30-43% | Above 45% |
Source: NAR Profile of Home Buyers & Sellers and Fannie Mae Guidelines
Benchmark data sourced from NAR Profile of Home Buyers & Sellers and Fannie Mae Guidelines.
From analyzing embed performance across hundreds of websites, businesses that replace static forms with interactive tools like this one see 3-5x more qualified leads — visitors volunteer their data because they get personalized results in return.
One of the most common mistakes we see when working with clients: borrowing the maximum available. Lenders may qualify you at 45% DTI, but personal finance advisors recommend keeping housing under 25% of take-home pay. Maximum borrowing leaves zero buffer for property tax reassessments, roof replacements, or job loss. The median US homeowner spends 22% of income on housing (Census ACS data).
Embed This Calculator on Your Website
Every visitor who uses your embedded calculator becomes a qualified lead. Their inputs, results, and business data are captured and sent to your CRM — before you ever pick up the phone.
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The average US mortgage is $405,000 over 30 years at 6.5% costing over $500,000 in total interest according to Freddie Mac data. Enter your home price, down payment, interest rate, and loan term to calculate monthly payments, total interest, and affordability at a glance.
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Closing costs average 2 to 5% of the purchase price adding $8,000 to $20,000 to a typical US home transaction according to Zillow data. Enter your purchase price and location to estimate loan origination, title insurance, escrow, appraisal, transfer taxes, and recording fees.
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