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🏡 Mortgage Affordability Calculator
Find out how much house you can afford based on your income, debts, and down payment. See lender-focused DTI ratios.
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Typical range: 0.5%–2.0% of home value
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Suggestion: ~1% of home price annually
🏠 Your Home Affordability Results
Maximum home price you can afford
$0
Based on lender DTI limits (28% front / 43% back)
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Leave empty or zero to use lender DTI limits. Set a value to see home price based on YOUR preferred monthly payment.
Estimated Monthly Payment (PITI + PMI + HOA)
$0
Principal & Interest | Tax | Insurance | PMI | HOA
Loan amount needed
$0
Front-end DTI
0%(PITI + HOA) ÷ Gross Monthly Income
Lender typical max: 28%
Back-end DTI
0%(PITI + HOA + Monthly Debt) ÷ Gross Monthly Income
Lender typical max: 43%
📊 View Loan Summary (Total Interest & True Cost)
Total interest paid: $0
Total cost of home (Price + Interest + Tax + Insurance): $0
Loan term: 30 years
Break-even point (approx): —
*Total cost includes principal, interest, property tax, and insurance over full term. Does not include PMI after it drops (estimated).
💡 DTI Insight: Front-end DTI includes housing costs only. Back-end adds all monthly debts. Lenders often limit front-end to 28% and back-end to 43% for conventional loans.
🏡 Smart Home Finance Tools
Tap any calculator below — real-time results, no spreadsheets needed ⚡
📘 How to Use the Mortgage Affordability Calculator
Understand the math, your DTI ratios, and why this tool gives you a realistic home buying budget.
Why This Calculator Matters
Buying a home is exciting, but knowing your true budget before you start shopping is the single most important step. Many online calculators only show a monthly payment. This tool goes further by incorporating real lender requirements — specifically your Debt-to-Income (DTI) ratios. It prevents you from falling in love with a house you cannot get a loan for and helps you avoid becoming “house poor.”
How to Use the Calculator
1️⃣ Enter Your Finances
Start with your annual pre-tax household income, monthly debt payments (credit cards, car loans, student loans), and your planned down payment amount.
2️⃣ Adjust Loan Details
Input an estimated interest rate (check current averages), loan term, property tax, and insurance. You can toggle property tax between a dollar amount or a percentage rate.
3️⃣ Fine-Tune Advanced Options
Select your credit tier (Excellent, Good, Fair) for precise PMI calculations. Use the "What If?" slider to see how a lower monthly payment affects the home price you can afford.
4️⃣ Read Your Results
See your maximum affordable home price, monthly payment breakdown, and — most critically — your front-end DTI (housing only) and back-end DTI (housing + debts).
The Math Behind It: Real Examples
The calculator uses two main formulas that lenders actually check. Here is how it works with a concrete example:
Example: $90,000 annual income → $7,500 gross monthly income
Monthly debts: $500 (car + student loan) | Down payment: $40,000 | Interest rate: 6.2% | 30-year loan
Front-end DTI (28% limit):
$7,500 × 0.28 = $2,100 max for housing costs
$7,500 × 0.28 = $2,100 max for housing costs
Back-end DTI (43% limit):
($7,500 × 0.43) − $500 debts = $2,725 max for housing
($7,500 × 0.43) − $500 debts = $2,725 max for housing
The calculator takes the lower of the two ($2,100) → solves for maximum home price ≈ $295,000 (including tax, insurance, PMI). That is a number a lender would approve.
✨ The same logic applies to any income or debt level — the calculator runs a binary search to find the exact home price that fits within both DTI limits.
Why DTI Ratios Are the Key
Front-end DTI
(PITI + HOA) ÷ Gross Monthly Income. Lenders typically cap this at 28%. It measures only your housing expenses.
Back-end DTI
(PITI + HOA + Monthly Debts) ÷ Gross Monthly Income. Lenders cap this at 43% (sometimes 50% with strong compensating factors).
⚠️ If your back-end DTI exceeds 43%, you can lower it by: paying down debts, increasing your down payment, choosing a lower-priced home, or improving your credit score to reduce PMI.
Frequently Asked Questions
❓ What if I have no debt? Does that change my affordability?
Yes! With zero monthly debt, your back-end DTI becomes equal to your front-end DTI. You can typically afford a higher home price, but you remain capped by the 28% front-end limit. The calculator automatically handles this.
❓ How accurate is the PMI calculation?
PMI rates vary by lender and credit score. We use tiered rates: Excellent (0.25% annual), Good (0.5%), Fair (0.85%). This gives a realistic estimate ±0.1% of actual quotes. Better credit = lower PMI.
❓ Should I include utilities and maintenance in my budget?
Yes — that is why the calculator has an optional "Monthly utilities & maintenance" checkbox. A common rule is 1% of the home's value per year for maintenance. Including this prevents you from becoming house poor.
❓ What does "What If?" slider do?
It solves backwards: you tell the calculator "I want my monthly payment to be no more than $X," and it shows the maximum home price that fits your preferred budget, even if that budget is stricter than lender limits. Perfect for conservative buyers.
❓ Do I need a 20% down payment?
Not necessarily. Many conventional loans allow 3-5% down, and FHA loans require as little as 3.5%. However, down payments under 20% trigger PMI. The calculator shows you exactly when PMI applies.
❓ Can I use this for an FHA or VA loan?
The calculator uses conventional loan DTI limits (28/43). FHA allows up to 31% front-end / 43% back-end (sometimes 46.9% with offsets). VA loans have no set DTI cap but typically 41% back-end. Use this as a conservative baseline.
Pro Tip: Use this calculator before you talk to a lender. You will walk in confident, knowing your target price range and exactly how changes to your down payment or debts affect your approval odds.
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