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Income drives affordability
Debt payments reduce buying power
Rates change loan size
Down payment lifts max home price
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Home›Calculators›Mortgage & Real Estate›House Affordability Calculator

House Affordability Calculator
Income, Debt, Rates and Home Budget

Estimate how much home you may be able to afford based on income, debts, down payment, mortgage rate, and monthly housing costs.

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Your House Affordability Estimate
Income and Debt
mode
Choose whether you want affordability based on gross annual income or net monthly income.
cur
Global estimate with local currency display.
€
Enter annual amount in gross-annual mode or monthly amount in net-monthly mode.
€
Optional second income. Leave as zero if not relevant.
€
Include car loans, student loans, credit cards, and other recurring debt obligations.
Mortgage Setup
€
Cash contribution added to the affordable loan amount to estimate max home price.
%
Fixed-rate assumption for the affordability estimate.
term
Shorter terms reduce affordable loan size for the same monthly budget.
€
Manual monthly estimate included in total housing cost.
€
Manual monthly estimate for home insurance.
€
Optional monthly building or service charge.
Affordability Ratios
%
Max share of income allocated to housing costs.
%
Max share of income allocated to housing plus debts.
Recommended Max Home Price
—
based on income, debts, rate, term and monthly housing costs
Estimated affordable loan amount
—
—
Monthly Income Used
—
household monthly income
Max Housing Budget
—
after DTI constraint
Mortgage Payment Budget
—
after taxes, insurance, HOA
Affordable Loan Amount
—
estimated mortgage size
Down Payment
—
cash contribution
Recommended Max Home Price
—
loan plus down payment
Estimated Monthly Housing Cost
—
all-in monthly cost
DTI Constraint Used
—
binding ratio
Front-End Ratio Result
—
housing ÷ income
Back-End Ratio Result
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housing + debts ÷ income
Affordability Breakdown
Front-End vs Back-End Constraint
Front-end monthly limit—
Back-end monthly limit—
Difference—
Binding constraint—
15 vs 30 Year Mortgage
15-year max home price—
30-year max home price—
Loan amount difference—
Home price difference—
Lower Rate vs Higher Rate
Lower rate affordable loan—
Higher rate affordable loan—
Loan amount difference—
Price difference—
Model Summary
Monthly debts—
Monthly non-mortgage housing costs—
Estimated monthly mortgage payment—
Recommended max home price—
Affordability vs Interest Rate
Max home price
Loan amount
Rate Scenario Table
Interest RateAffordable Loan AmountRecommended Home Price
Important: This calculator estimates home affordability using fixed income, debt, interest rate, term, and housing cost assumptions. It does not replace lender underwriting, mortgage advice, or country-specific affordability rules. It is an estimate only.
✦ Cal, AI Explanation
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💬 Ask Cal about your home budget
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Your house affordability estimate is ready. Ask me about DTI, mortgage rates, loan size, or why lender results can differ.

🏠 Affordability Notes

Higher rates reduce affordability
Debt payments reduce buying power
Shorter terms lower affordable loan size
Down payment increases max home price
Fixed-rate estimate only
Estimate only

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Mortgage Payment Calculator→ Mortgage Overpayment Calculator→ Down Payment Calculator→ Mortgage Comparison Calculator→ Buy vs Rent Calculator→

Related Guides

How House Affordability Works→ DTI Ratios Guide→ Mortgage Rate Impact Guide→

How house affordability works

House affordability starts with income, existing debt payments, and a monthly housing budget. This calculator uses front-end and back-end ratio targets, subtracts monthly property costs, reverses the mortgage payment formula, and then adds the down payment to estimate a maximum home price.

Monthly income
× front-end ratio = front-end housing ceiling
Monthly income × back-end ratio − monthly debts = back-end housing ceiling
Lower ceiling = housing budget used
Housing budget − property tax − insurance − HOA = mortgage payment budget
Mortgage payment budget → affordable loan amount
Affordable loan amount + down payment = recommended max home price
This version is a clean affordability estimate, not lender underwriting.

Front-end vs back-end ratio explained

The front-end ratio focuses on housing costs alone, while the back-end ratio includes both housing costs and other debt obligations. The lower of the two limits usually becomes the binding affordability constraint.

Ratio TypeWhat It Measures
Front-end ratioHousing costs ÷ monthly income
Back-end ratioHousing costs + debts ÷ monthly income

Interest rate impact explained

A higher mortgage rate raises the payment required for the same loan amount. When the monthly budget is fixed, that means the affordable loan size falls as rates rise.

Down payment impact explained

A larger down payment does not change the debt-to-income constraint, but it increases the total home price you can target because more of the purchase is covered with cash instead of debt.

Frequently Asked Questions

How much house can I afford?+
It depends on your income, monthly debt payments, mortgage rate, term, down payment, and other housing costs like property tax and insurance.
What is front-end ratio?+
Front-end ratio measures housing costs as a share of monthly income. It is one of the main affordability limits used in this calculator.
What is back-end ratio?+
Back-end ratio measures housing costs plus other debt payments as a share of monthly income. It often becomes the tighter limit when you already have debts.
Why does a higher mortgage rate reduce affordability?+
Because more of the same monthly budget is consumed by interest, which reduces the loan size that fits inside that budget.
Why can lender results differ from this estimate?+
Lenders may use different underwriting rules, stress tests, credit scoring, reserve requirements, local regulations, and product-specific costs that are outside this simplified model.