Maximum Mortgage Calculator
Use this calculator to determine your maximum mortgage and how different interest rates affect how much you can borrow.
How the maximum mortgage calculator works
It takes the largest total monthly debt a lender allows — your debt-to-income limit applied to gross income — subtracts your existing debts and estimated taxes and insurance, and treats what remains as the affordable principal-and-interest payment. That payment is then converted into the loan it can support.
Worked example: with gross monthly income of $7,000, other monthly debt payments of $600 and max debt-to-income ratio of 43.00%, the maximum mortgage calculator shows maximum home price of $360,093.
- Affordable payment (P&I)
- $1,960.00
- Maximum loan
- $310,093
- Maximum home price
- $360,093
- DTI used
- 43%
The formula
Affordable P&I = income × DTI% − other debts − taxes & insurance. Maximum loan = present value of that payment at your rate and term; maximum price = loan + down payment.
Results are estimates for educational purposes and are not financial advice. Confirm exact figures with your lender, plan administrator or advisor.
Questions about the maximum mortgage calculator
How much mortgage can I afford?
Lenders cap your total monthly debt at a percentage of gross income (often 43%). Whatever is left after existing debts and housing costs sets the loan you can support.
What debt-to-income ratio do lenders use?
Conventional loans often allow up to 43–45%, though a lower ratio improves your rate and approval odds. The calculator lets you test different limits.
Does a bigger down payment raise my maximum price?
Yes — the loan amount is capped by your income, but adding a larger down payment increases the total home price you can buy on top of that loan.
Is the Maximum Mortgage Calculator free to use?
Yes. Every calculator on FinCalculators is completely free, with no sign-up, login or paywall. You can run as many scenarios as you like.