Mortgage Affordability Calculator

Estimate the max home price your income, debts, down payment, DTI target, and housing-cost assumptions can support.

Income and cash

Gross income

Pre-tax income before deductions.

Pay frequency

Other monthly debt

Car loans, student loans, and card minimums.

Down payment

Loan target

Mortgage rate

Term

Target back-end DTI

Conservative Standard Aggressive Custom

Conventional 36% rule of thumb; FHA can reach 43%.

Adjust tax, insurance, HOA, and PMI assumptions

Annual property tax

Annual insurance

Monthly HOA

PMI rate

Mortgage affordability estimate

Income: —
Other debt: —
Down payment: —
Rate / term: —
Target DTI: —
Assumptions: —

Max home price

—

Max monthly P+I: —

Monthly PITI

— total housing payment

Principal + interest: —
Property tax: —
Insurance: —
HOA: —
PMI Applied only when LTV is above 80%.: —

Cashflow and DTI

At the selected ceiling.

Loan amount: —
Monthly cashflow after housing: —
Front-end DTI: —
Back-end DTI: —
PMI status: —

Scenario comparison

Same inputs, different back-end DTI ceilings.

Conservative, standard, and aggressive affordability ceilings

Scenario	Max price	Monthly PITI	Back-end DTI

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How this is calculated

The calculator starts with gross monthly income and caps total debt at the selected back-end DTI. Other listed debt is subtracted first; the remainder is the maximum monthly PITI payment.

Principal and interest use the standard fixed-rate mortgage payment formula with APR divided by 12. Property tax scales with the solved home price, insurance and HOA use the entered dollar assumptions, and PMI is added when loan-to-value is above 80%.

This is a ceiling estimate, not a recommendation to spend the full amount. Credit score, reserves, closing costs, loan program rules, and local taxes can change lender approval.

How we choose and check our formulas