Home Affordability Calculator
See how much house you can afford from your income, debts and a debt-to-income limit.
Runs in your browser. Your data is not uploaded.
Estimates only. Not financial, legal or tax advice. Lenders use their own criteria.
How to use
- Enter your monthly gross income and existing monthly debt payments.
- Set the maximum debt-to-income percentage, rate, term and down payment.
- Read the affordable monthly payment, maximum loan and maximum price.
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Frequently asked questions
How do I calculate how much house I can afford?
Enter your monthly gross income, your existing monthly debts and a maximum debt-to-income percentage, then add the rate, term and down payment. The page shows the amount left for a new payment, the maximum loan and the maximum home price.
What is a debt-to-income ratio and how is it used here?
The percentage is the share of your gross monthly income that lenders allow for debt payments. The page multiplies your income by that percentage, subtracts your existing debts, and treats the remainder as the amount available for a new loan.
How is the maximum loan amount calculated?
The available monthly payment is treated as an annuity payment. The page applies the monthly rate and the number of months to discount that payment stream, and at a 0% rate it simply multiplies the payment by the number of months.
How do I work out the available monthly payment?
Multiply your gross monthly income by the debt-to-income percentage, divide by 100, then subtract your existing monthly debts. With 1000 income, a 36% limit and 200 of debts, 160 is left for a new payment.
How do I change the down payment effect on the price?
The maximum price is the maximum loan divided by 1 minus the down payment percentage. Raising the down payment lowers the loan you need for the same price, so the page can show a higher affordable price for the same income.
What happens if my debts already exceed the limit?
The page shows the message "No room for a new loan at these inputs." and all three figures become dashes. Lower the existing debt figure, raise the debt-to-income percentage or increase the income to get a result.
What happens at a 100% down payment?
A 100% down payment cannot be calculated because the price would require a division by zero. The page displays "Down payment must be below 100%." instead of a maximum price, and the three figures show dashes.
Does the calculator include taxes, insurance or HOA fees?
No. Only the income, the debts and the loan terms you enter are used. Property taxes, home insurance, association fees and maintenance are missing, so keep room in your budget for costs that the maximum price does not cover.
Are lender affordability rules applied to the result?
No. This is a planning estimate built on the percentage you choose. Lenders use their own criteria, including credit history, employment, existing credit limits and stress tests, so a lender may offer less than this page shows.
Is my income stored or uploaded?
No. The figures stay in browser memory and nothing is sent to a server or saved between visits. Closing or reloading the page clears your entries and restores the defaults.