Home Affordability Calculator
Work backward from your income and debts to the home price and mortgage you can responsibly afford, using both the housing (front-end) and total-debt (back-end) ratios lenders apply.
How the home affordability calculator works
This calculator reasons the way an underwriter does, only in reverse. Instead of starting from a home price, it starts from your gross income and your existing monthly debts, then applies two guardrails lenders lean on: a front-end ratio that caps housing costs near 28 percent of income, and a back-end ratio that caps all your debt payments around 36 to 43 percent.
The lower of the two limits sets how much room is left for principal and interest. From that affordable payment it discounts back to a maximum loan amount, then adds your down payment to arrive at a realistic home-price target.
Worked example: with gross monthly income of $8,200, other monthly debt payments of $600 and down payment available of $60,000, the home affordability calculator shows home price you can afford of $344,614.
- Affordable payment (P&I)
- $1,846.00
- Maximum loan
- $284,614
- Maximum home price
- $344,614
- Binding limit
- 28% housing
| Gross monthly income | Home price you can afford |
|---|---|
| $5,500 | $203,386 |
| $8,200 | $344,614 |
| $11,000 | $465,490 |
| $16,000 | $681,340 |
The formula
Affordable housing payment = gross monthly income times the lesser of (front-end cap) or (back-end cap minus existing debt payments). That payment, net of estimated taxes and insurance, is converted to a loan with the annuity formula L = PMT × [1 − (1 + r)^−n] / r, where r is the monthly rate and n the number of payments. Home price = loan + down payment.
- Uses representative DTI caps near 28% front-end and 36–43% back-end; your lender may apply tighter or looser limits by program.
- Income is treated as stable, documented, gross pay — bonuses, self-employment, or variable income are often averaged or discounted.
- Property tax, insurance, HOA, and PMI consume part of the payment; rough estimates here can shift the result by a wide margin.
- Credit score, reserves, and loan type all move the rate and the caps, so confirm a real number with a lender before shopping.
- The output is a borrowing ceiling, not a budget — what you qualify for and what you should spend are rarely the same figure.
Reference data
Current figures behind this tool: 2026 Conforming Loan Limits, 2026 USDA Loan Income Limits, Minimum Credit Score by Loan Type, DTI Limits by Loan Type.
Results are estimates for educational purposes and are not financial advice. Confirm exact figures with your lender or a licensed advisor.
Questions about the home affordability calculator
Why does the calculator sometimes return a lower price than my income alone suggests?
Because the back-end ratio counts every recurring debt — car loans, student loans, minimum card payments — against the same income.
When those obligations are heavy, they crowd out room for a mortgage payment, so the total-debt cap, not the housing cap, becomes the binding constraint and pulls your affordable price down.
Does a larger down payment raise how much home I can afford?
Yes, in two ways. It adds directly to your purchasing power dollar for dollar on top of the loan, and by shrinking the financed balance it lowers the monthly payment, which can free up DTI headroom. Clearing 20 percent also removes PMI, returning that premium to your housing budget.
Should I borrow the full amount this tool says I can afford?
Treat it as a ceiling, not a target. The ratios ignore lifestyle costs, retirement saving, childcare, and emergencies, and they assume today's rate holds.
Many buyers deliberately stay well under the maximum so a job change, rate reset, or surprise repair does not turn a comfortable payment into a strained one.
Is the Home Affordability Calculator free to use?
Yes. Every calculator on MortgageLoansCalculator is completely free, with no sign-up, login or paywall. Run as many scenarios as you like.
How much house can I afford?
A common rule keeps your total housing payment under 28% of gross monthly income and all debts under 36%.
Your down payment, interest rate and other debts all move the number — enter yours above to see a price you can comfortably carry.
What percentage of your income should go to your mortgage?
Aim to keep your monthly housing payment (principal, interest, taxes and insurance) at or below 28% of gross income — the front-end ratio lenders use — with total debts under about 36%.
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