How to Use Our Home Affordability Calculator
Our calculator takes your income, existing debts, and a few housing assumptions and works out either a monthly payment estimate or an affordable purchase price.
Enter your numbers, adjust the sliders, and the result updates immediately.
| Input |
What It Means |
| Annual income |
Gross household income before taxes. Used to calculate your debt-to-income ratio so you can see where you land relative to common lending guidelines. |
| Other monthly debt |
Recurring obligations like car loans, student loans, and credit card minimums. In Find Purchase Price mode, this amount is subtracted from your budget before the calculator solves for a home price. |
| Down payment |
The percentage of the purchase price you plan to pay upfront. Going below 20% on a conventional loan will add PMI to your monthly cost. |
| Interest rate |
The mortgage rate for the scenario you are testing. Try a few different values to see how sensitive your budget is to rate changes. |
| Loan term |
30 years is the most common choice and produces the lowest monthly payment. 15 years means higher payments but less total interest paid. |
| Property taxes, insurance, PMI, HOA |
These are set to reasonable defaults and adjustable in Advanced Options. Together they can add several hundred dollars a month to a base P&I payment. |
How To Calculate Home Affordability
The calculator runs in two directions depending on which mode you choose.
Find Monthly Payment starts with a purchase price and works forward: it calculates your principal and interest payment using the standard fixed-rate amortization formula, then adds estimated taxes, insurance, PMI or MIP (when applicable), and HOA dues to produce a full monthly housing cost.
If you have entered existing monthly debt, that is added separately so you can see your total monthly obligation.
Find Purchase Price works in reverse. It starts with your monthly budget, subtracts your existing debt to find what is available for housing, then solves for the purchase price whose total monthly housing cost equals that remaining amount. The result shifts when you change the rate, term, down payment, or any of the cost components in Advanced Options.
Why the Result Changes So Much
Higher interest rates reduce the loan amount that fits inside a given monthly payment.
A rate that is one percentage point higher can reduce your affordable purchase price by tens of thousands of dollars depending on your budget.
A larger down payment works in your favor because you borrow less, which means the same payment supports a higher price. Lower monthly debt increases the amount left over for housing, which also pushes the affordable price up.
What the Calculator Does Not Include
The calculator assumes a fixed-rate mortgage. It does not model adjustable rates, interest-only periods, or any loan structure where the payment can change over time.
Property taxes and insurance are estimates you control. The defaults are reasonable national averages but your actual costs will depend on location, property type, and the coverage you choose.
The estimate does not account for closing costs, prepaid items, cash reserves, or any other funds you will need at closing beyond the down payment.
The calculator does not pull your credit score, verify your income, or assess your eligibility for any specific loan program. It is a planning tool, not a preapproval.
How to Read the Result
Treat the output as a range, not a precise target. The number you see represents one specific combination of inputs. Small changes to your rate assumption, down payment, or tax estimate will shift it. Running a few variations is more useful than anchoring to a single figure.
Most buyers find it helpful to stay noticeably below whatever the calculator shows as a ceiling. Owning a home brings costs that do not show up in a monthly payment estimate: maintenance, repairs, utilities, and the unexpected. A budget with room in it is more durable than one that runs right to the edge.
The Bottom Line
Our affordability calculator translates income, debt, rate, and down payment assumptions into a working home price estimate. That makes it useful for planning conversations, comparing scenarios, and building a realistic sense of your range before you start shopping.
Actual qualification depends on your full credit profile, the loan program, property details, and the lender's underwriting. Use this as a starting point, then work with a loan officer to get a real number.
Frequently Asked Questions
What DTI ratio does the calculator use?
The calculator does not enforce a single DTI cutoff. Instead it shows you the monthly payment and total debt obligation side by side so you can see where you land. Most conventional lenders look for a back-end DTI below 45 percent, though some programs allow higher ratios with compensating factors like strong credit or significant reserves.
Should I use gross income or take-home pay?
Use gross income, which is your income before taxes and other withholdings. That is the figure lenders use when they calculate your debt-to-income ratio, and it is the standard for affordability calculations.
What counts as monthly debt?
Include minimum payments on credit cards, auto loans, student loans, personal loans, and any other installment or revolving obligations that show up on your credit report. Do not include your current rent payment if you plan to replace it with a mortgage, and do not include utilities, subscriptions, groceries, or other living expenses. Those are part of your overall budget but lenders do not count them in DTI.
How does PMI affect the estimate?
If your down payment is below 20 percent and you are not using an FHA loan, the calculator adds private mortgage insurance to the monthly cost. The PMI rate defaults to 0.85 percent annually but you can adjust it in Advanced Options. PMI is typically removed once your loan balance reaches 80 percent of the original home value, though the exact rules depend on your loan terms.
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