Home Affordability Calculator

How Much House Can I Afford?

The answer depends on two things: your income and your existing debts. Lenders use a metric called the Debt-to-Income ratio (DTI) to decide how much they are willing to lend you. This calculator works backwards from your income and debts to show you the maximum home price you can realistically qualify for.

There are two DTI limits lenders look at. The front-end DTI looks only at your housing costs — principal, interest, taxes, and insurance — and most lenders prefer this to stay at or below 28% of your gross monthly income. The back-end DTI adds all your other monthly debts on top of housing, and lenders typically want this below 43%. Your maximum home price is determined by whichever limit hits first.

How to Use This Home Affordability Calculator

What Is DTI and Why Does It Matter?

DTI stands for Debt-to-Income ratio. It is the single most important number lenders look at when deciding whether to approve your mortgage. A low DTI tells a lender that you have enough breathing room in your budget to handle a mortgage payment comfortably. A high DTI signals financial stress and increases the risk of default from the lender's perspective.

Most conventional loans require a back-end DTI of 43% or lower. FHA loans can sometimes go up to 50% with compensating factors like a high credit score or large cash reserves. VA loans are more flexible but still consider DTI carefully. The lower your DTI, the better your approval odds and the better interest rate you are likely to receive.

Tips to Improve Your DTI

How Lenders Calculate What You Can Afford

Lenders primarily use two DTI ratios to determine how much you can borrow: front-end (housing costs divided by gross income, max ~28%) and back-end (all debts divided by gross income, max ~43% for conventional loans). This home affordability calculator uses the back-end DTI with a 43% threshold, which is the standard Qualified Mortgage limit. FHA loans may allow up to 57% back-end DTI with compensating factors like a high credit score or significant cash reserves. Understanding which limit is constraining your buying power — front-end or back-end — is key to making smart moves before you apply.

How to Increase Your Home Buying Power

Paying down existing debts before applying can have a dramatic effect. Eliminating a $400/month car payment can increase your maximum home price by $20,000–$40,000 at today's rates. A higher credit score unlocks lower interest rates, which directly increases affordability — going from a 680 to a 740 score can lower your rate by 0.25%–0.5%, which meaningfully shifts your max purchase price. A larger down payment reduces the loan amount needed and may eliminate PMI. And increasing income through a side job, raise, or adding a co-borrower shifts your DTI meaningfully — even a $500/month income increase can add $30,000+ to your buying power.

Why Pre-Approval Matters More Than the Calculator

This affordability calculator gives you a reliable estimate based on standard DTI guidelines, but mortgage pre-approval from a lender gives you an actual commitment. Pre-approval considers your full credit report, employment history, asset verification, and the specific loan program guidelines that apply to you. It also makes your offer significantly more competitive in a tight market — sellers take pre-approved buyers much more seriously than buyers with just an estimate. Use this calculator to set your budget range and understand your limits, then get pre-approved before you start seriously house hunting.