Home affordability calculator guide
Home affordability depends on the full housing payment, not price alone. Principal, interest, property tax, insurance, association dues, and mortgage insurance can all affect the monthly obligation.
The estimate uses front-end and back-end debt-to-income limits, but a lender may calculate qualifying income and debt differently.
How to use the home affordability calculator
- Enter gross income: Use stable annual income before taxes.
- Add required monthly debts: Include cards, loans, and support obligations.
- Enter cash and loan terms: Add down payment, rate, and term.
- Include ownership charges: Estimate taxes, insurance, and HOA dues.
Formula and variables
The calculator applies the entered housing, financing, and cost assumptions consistently.
Housing budget = lesser of income × front-end limit or income × back-end limit − other debt- DTI — Debt-to-income limit
- Planning share of gross income used for required payments.
- PITI — Total housing payment
- Principal, interest, taxes, and insurance, plus applicable dues.
Worked example: income and DTI constrain price
A household earns $80,000 and pays $800 in other monthly debt.
- Down payment
- $60,000
- Calculate both housing limits.
- Use the lower monthly budget.
- Solve for price after taxes and insurance.
Result: An estimated maximum planning price
A comfortable personal budget may be lower than a qualification estimate.
Understanding your results
Estimated home price
Price whose modeled housing cost fits the selected DTI limits.
Housing budget
Maximum modeled monthly housing payment.
Assumptions
- Fixed-rate fully amortizing mortgage.
- Entered taxes and insurance remain representative.
Limitations
- PMI, closing costs, utilities, and maintenance are not fully modeled.
- Approval standards and qualifying income vary.
Common mistakes
- Using take-home income.
- Ignoring property taxes or HOA dues.
- Treating maximum qualification as a comfortable budget.
Practical use cases
Compare housing scenarios
Change one assumption at a time to identify the factors driving the result.
Plan before committing
Use estimates to prepare questions and budgets, not as a guarantee.
Planning and decision guide
Keep room for ownership costs
Repairs, utilities, moving, furnishings, and reserves sit outside lender DTI.
Cash needed exceeds the down payment
Closing costs and emergency reserves can materially reduce usable cash.
Stress-test rate and tax changes
A modest change can shift affordable price substantially.
Frequently asked questions
How much house can I afford?
It depends on income, required debt, cash, interest rate, taxes, insurance, dues, and your broader budget.
Does affordability use gross income?
Mortgage DTI generally uses qualifying gross income.
Is the result a preapproval?
No. It is a planning estimate.
Should I spend the maximum?
Not necessarily; choose a payment that leaves room for other goals and unexpected costs.
Sources and review
- Your home loan toolkit — Consumer Financial Protection Bureau. Accessed 2026-07-10.
Reviewed 2026-07-10.